Thu Feb 5 16:26:10 2009

Asterisk developer's documentation


channel.c File Reference

Channel Management. More...

#include "asterisk.h"
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <sys/time.h>
#include <signal.h>
#include <errno.h>
#include <unistd.h>
#include <math.h>
#include "asterisk/pbx.h"
#include "asterisk/frame.h"
#include "asterisk/sched.h"
#include "asterisk/options.h"
#include "asterisk/channel.h"
#include "asterisk/audiohook.h"
#include "asterisk/musiconhold.h"
#include "asterisk/logger.h"
#include "asterisk/say.h"
#include "asterisk/file.h"
#include "asterisk/cli.h"
#include "asterisk/translate.h"
#include "asterisk/manager.h"
#include "asterisk/chanvars.h"
#include "asterisk/linkedlists.h"
#include "asterisk/indications.h"
#include "asterisk/monitor.h"
#include "asterisk/causes.h"
#include "asterisk/callerid.h"
#include "asterisk/utils.h"
#include "asterisk/lock.h"
#include "asterisk/app.h"
#include "asterisk/transcap.h"
#include "asterisk/devicestate.h"
#include "asterisk/sha1.h"
#include "asterisk/threadstorage.h"
#include "asterisk/slinfactory.h"

Go to the source code of this file.

Data Structures

struct  ast_cause
struct  ast_silence_generator
struct  backends
struct  chanlist
struct  channels
struct  tonepair_def
struct  tonepair_state

Defines

#define AST_DEFAULT_EMULATE_DTMF_DURATION   100
#define AST_MIN_DTMF_DURATION   80
#define AST_MIN_DTMF_GAP   45
#define FORMAT   "%-10.10s %-40.40s %-12.12s %-12.12s %-12.12s\n"
#define MONITOR_CONSTANT_DELAY
#define MONITOR_DELAY   150 * 8
#define STATE2STR_BUFSIZE   32

Functions

static int __ast_queue_frame (struct ast_channel *chan, struct ast_frame *fin, int head)
 Queue an outgoing media frame.
static struct ast_frame__ast_read (struct ast_channel *chan, int dropaudio)
ast_channel__ast_request_and_dial (const char *type, int format, void *data, int timeout, int *outstate, const char *cid_num, const char *cid_name, struct outgoing_helper *oh)
int ast_activate_generator (struct ast_channel *chan, struct ast_generator *gen, void *params)
int ast_active_channels (void)
 returns number of active/allocated channels
int ast_answer (struct ast_channel *chan)
 Answer a ringing call.
void ast_begin_shutdown (int hangup)
 Initiate system shutdown.
int ast_best_codec (int fmts)
 Pick the best audio codec.
ast_channelast_bridged_channel (struct ast_channel *chan)
 Find bridged channel.
int ast_call (struct ast_channel *chan, char *addr, int timeout)
 Make a call.
void ast_cancel_shutdown (void)
 Cancel a shutdown in progress.
const char * ast_cause2str (int cause)
 Gives the string form of a given hangup cause.
void ast_change_name (struct ast_channel *chan, char *newname)
 Change channel name.
ast_channelast_channel_alloc (int needqueue, int state, const char *cid_num, const char *cid_name, const char *acctcode, const char *exten, const char *context, const int amaflag, const char *name_fmt,...)
 Create a channel structure.
enum ast_bridge_result ast_channel_bridge (struct ast_channel *c0, struct ast_channel *c1, struct ast_bridge_config *config, struct ast_frame **fo, struct ast_channel **rc)
 Bridge two channels together.
int ast_channel_cmpwhentohangup (struct ast_channel *chan, time_t offset)
 Compare a offset with the settings of when to hang a channel up.
int ast_channel_datastore_add (struct ast_channel *chan, struct ast_datastore *datastore)
 Add a datastore to a channel.
ast_datastoreast_channel_datastore_alloc (const struct ast_datastore_info *info, char *uid)
 Create a channel datastore structure.
ast_datastoreast_channel_datastore_find (struct ast_channel *chan, const struct ast_datastore_info *info, char *uid)
 Find a datastore on a channel.
int ast_channel_datastore_free (struct ast_datastore *datastore)
 Free a channel datastore structure.
int ast_channel_datastore_inherit (struct ast_channel *from, struct ast_channel *to)
 Inherit datastores from a parent to a child.
int ast_channel_datastore_remove (struct ast_channel *chan, struct ast_datastore *datastore)
 Remove a datastore from a channel.
int ast_channel_defer_dtmf (struct ast_channel *chan)
 Set defer DTMF flag on channel.
void ast_channel_free (struct ast_channel *chan)
 Free a channel structure.
void ast_channel_inherit_variables (const struct ast_channel *parent, struct ast_channel *child)
 Inherits channel variable from parent to child channel.
int ast_channel_make_compatible (struct ast_channel *chan, struct ast_channel *peer)
 Makes two channel formats compatible.
int ast_channel_masquerade (struct ast_channel *original, struct ast_channel *clone)
 Weird function made for call transfers.
char * ast_channel_reason2str (int reason)
 return an english explanation of the code returned thru __ast_request_and_dial's 'outstate' argument
int ast_channel_register (const struct ast_channel_tech *tech)
 Register a channel technology (a new channel driver) Called by a channel module to register the kind of channels it supports.
int ast_channel_sendhtml (struct ast_channel *chan, int subclass, const char *data, int datalen)
int ast_channel_sendurl (struct ast_channel *chan, const char *url)
int ast_channel_setoption (struct ast_channel *chan, int option, void *data, int datalen, int block)
 Sets an option on a channel.
void ast_channel_setwhentohangup (struct ast_channel *chan, time_t offset)
 Set when to hang a channel up.
ast_silence_generatorast_channel_start_silence_generator (struct ast_channel *chan)
 Starts a silence generator on the given channel.
void ast_channel_stop_silence_generator (struct ast_channel *chan, struct ast_silence_generator *state)
 Stops a previously-started silence generator on the given channel.
int ast_channel_supports_html (struct ast_channel *chan)
void ast_channel_undefer_dtmf (struct ast_channel *chan)
 Unset defer DTMF flag on channel.
void ast_channel_unregister (const struct ast_channel_tech *tech)
 Unregister a channel technology.
ast_channelast_channel_walk_locked (const struct ast_channel *prev)
 Browse channels in use Browse the channels currently in use.
void ast_channels_init (void)
ast_variableast_channeltype_list (void)
 return an ast_variable list of channeltypes
int ast_check_hangup (struct ast_channel *chan)
 Check to see if a channel is needing hang up.
static int ast_check_hangup_locked (struct ast_channel *chan)
void ast_deactivate_generator (struct ast_channel *chan)
int ast_do_masquerade (struct ast_channel *original)
 Start masquerading a channel XXX This is a seriously wacked out operation. We're essentially putting the guts of the clone channel into the original channel. Start by killing off the original channel's backend. I'm not sure we're going to keep this function, because while the features are nice, the cost is very high in terms of pure nastiness. XXX.
static enum ast_bridge_result ast_generic_bridge (struct ast_channel *c0, struct ast_channel *c1, struct ast_bridge_config *config, struct ast_frame **fo, struct ast_channel **rc, struct timeval bridge_end)
ast_channelast_get_channel_by_exten_locked (const char *exten, const char *context)
 Get channel by exten (and optionally context) and lock it.
ast_channelast_get_channel_by_name_locked (const char *name)
 Get channel by name (locks channel).
ast_channelast_get_channel_by_name_prefix_locked (const char *name, const int namelen)
 Get channel by name prefix (locks channel).
ast_channel_techast_get_channel_tech (const char *name)
 Get a channel technology structure by name.
ast_group_t ast_get_group (const char *s)
int ast_hangup (struct ast_channel *chan)
 Hang up a channel.
int ast_indicate (struct ast_channel *chan, int condition)
 Indicates condition of channel.
int ast_indicate_data (struct ast_channel *chan, int _condition, const void *data, size_t datalen)
 Indicates condition of channel, with payload.
void ast_install_music_functions (int(*start_ptr)(struct ast_channel *, const char *, const char *), void(*stop_ptr)(struct ast_channel *), void(*cleanup_ptr)(struct ast_channel *))
int ast_internal_timing_enabled (struct ast_channel *chan)
 Check if the channel can run in internal timing mode.
void ast_moh_cleanup (struct ast_channel *chan)
int ast_moh_start (struct ast_channel *chan, const char *mclass, const char *interpclass)
 Turn on music on hold on a given channel.
void ast_moh_stop (struct ast_channel *chan)
 Turn off music on hold on a given channel.
char * ast_print_group (char *buf, int buflen, ast_group_t group)
 print call- and pickup groups into buffer
int ast_prod (struct ast_channel *chan)
 Send empty audio to prime a channel driver.
int ast_queue_control (struct ast_channel *chan, enum ast_control_frame_type control)
 Queue a control frame with payload.
int ast_queue_control_data (struct ast_channel *chan, enum ast_control_frame_type control, const void *data, size_t datalen)
 Queue a control frame with payload.
int ast_queue_frame (struct ast_channel *chan, struct ast_frame *fin)
 Queue an outgoing frame.
int ast_queue_frame_head (struct ast_channel *chan, struct ast_frame *fin)
 Queue an outgoing frame to the head of the frame queue.
int ast_queue_hangup (struct ast_channel *chan)
 Queue a hangup frame.
ast_frameast_read (struct ast_channel *chan)
 Reads a frame.
static void ast_read_generator_actions (struct ast_channel *chan, struct ast_frame *f)
ast_frameast_read_noaudio (struct ast_channel *chan)
 Reads a frame, returning AST_FRAME_NULL frame if audio. Read a frame.
int ast_readstring (struct ast_channel *c, char *s, int len, int timeout, int ftimeout, char *enders)
int ast_readstring_full (struct ast_channel *c, char *s, int len, int timeout, int ftimeout, char *enders, int audiofd, int ctrlfd)
int ast_recvchar (struct ast_channel *chan, int timeout)
 Receives a text character from a channel.
char * ast_recvtext (struct ast_channel *chan, int timeout)
 Receives a text string from a channel Read a string of text from a channel.
ast_channelast_request (const char *type, int format, void *data, int *cause)
 Requests a channel.
ast_channelast_request_and_dial (const char *type, int format, void *data, int timeout, int *outstate, const char *cidnum, const char *cidname)
 Request a channel of a given type, with data as optional information used by the low level module and attempt to place a call on it.
int ast_safe_sleep (struct ast_channel *chan, int ms)
 Wait for a specied amount of time, looking for hangups.
int ast_safe_sleep_conditional (struct ast_channel *chan, int ms, int(*cond)(void *), void *data)
 Wait for a specied amount of time, looking for hangups and a condition argument.
char * ast_safe_string_alloc (const char *fmt,...)
 printf the string into a correctly sized mallocd buffer, and return the buffer
int ast_say_character_str (struct ast_channel *chan, const char *str, const char *ints, const char *lang)
int ast_say_digit_str (struct ast_channel *chan, const char *str, const char *ints, const char *lang)
int ast_say_digits (struct ast_channel *chan, int num, const char *ints, const char *lang)
int ast_say_digits_full (struct ast_channel *chan, int num, const char *ints, const char *lang, int audiofd, int ctrlfd)
int ast_say_enumeration (struct ast_channel *chan, int num, const char *ints, const char *language, const char *options)
int ast_say_number (struct ast_channel *chan, int num, const char *ints, const char *language, const char *options)
int ast_say_phonetic_str (struct ast_channel *chan, const char *str, const char *ints, const char *lang)
int ast_senddigit (struct ast_channel *chan, char digit)
 Send a DTMF digit to a channel Send a DTMF digit to a channel.
int ast_senddigit_begin (struct ast_channel *chan, char digit)
int ast_senddigit_end (struct ast_channel *chan, char digit, unsigned int duration)
int ast_sendtext (struct ast_channel *chan, const char *text)
 Sends text to a channel Write text to a display on a channel.
void ast_set_callerid (struct ast_channel *chan, const char *callerid, const char *calleridname, const char *ani)
int ast_set_read_format (struct ast_channel *chan, int fmt)
 Sets read format on channel chan Set read format for channel to whichever component of "format" is best.
void ast_set_variables (struct ast_channel *chan, struct ast_variable *vars)
 adds a list of channel variables to a channel
int ast_set_write_format (struct ast_channel *chan, int fmt)
 Sets write format on channel chan Set write format for channel to whichever compoent of "format" is best.
int ast_setstate (struct ast_channel *chan, enum ast_channel_state state)
 Change the state of a channel.
int ast_settimeout (struct ast_channel *c, int samples, int(*func)(const void *data), void *data)
int ast_shutting_down (void)
 Returns non-zero if Asterisk is being shut down.
int ast_softhangup (struct ast_channel *chan, int cause)
 Softly hangup up a channel.
int ast_softhangup_nolock (struct ast_channel *chan, int cause)
 Softly hangup up a channel (no channel lock).
char * ast_state2str (enum ast_channel_state state)
 Gives the string form of a given channel state.
int ast_str2cause (const char *name)
 Convert a symbolic hangup cause to number.
int ast_tonepair (struct ast_channel *chan, int freq1, int freq2, int duration, int vol)
int ast_tonepair_start (struct ast_channel *chan, int freq1, int freq2, int duration, int vol)
void ast_tonepair_stop (struct ast_channel *chan)
int ast_transfer (struct ast_channel *chan, char *dest)
 Transfer a channel (if supported). Returns -1 on error, 0 if not supported and 1 if supported and requested.
char * ast_transfercapability2str (int transfercapability)
 Gives the string form of a given transfer capability.
void ast_uninstall_music_functions (void)
int ast_waitfor (struct ast_channel *c, int ms)
 Wait for input on a channel.
ast_channelast_waitfor_n (struct ast_channel **c, int n, int *ms)
 Waits for input on a group of channels Wait for input on an array of channels for a given # of milliseconds.
int ast_waitfor_n_fd (int *fds, int n, int *ms, int *exception)
 Waits for input on an fd This version works on fd's only. Be careful with it.
ast_channelast_waitfor_nandfds (struct ast_channel **c, int n, int *fds, int nfds, int *exception, int *outfd, int *ms)
 Waits for activity on a group of channels.
int ast_waitfordigit (struct ast_channel *c, int ms)
 Waits for a digit.
int ast_waitfordigit_full (struct ast_channel *c, int ms, int audiofd, int cmdfd)
 Wait for a digit Same as ast_waitfordigit() with audio fd for outputting read audio and ctrlfd to monitor for reading.
ast_channelast_walk_channel_by_exten_locked (const struct ast_channel *chan, const char *exten, const char *context)
 Get next channel by exten (and optionally context) and lock it.
ast_channelast_walk_channel_by_name_prefix_locked (const struct ast_channel *chan, const char *name, const int namelen)
 Get channel by name prefix (locks channel).
int ast_write (struct ast_channel *chan, struct ast_frame *fr)
 Write a frame to a channel This function writes the given frame to the indicated channel.
int ast_write_video (struct ast_channel *chan, struct ast_frame *fr)
 Write video frame to a channel This function writes the given frame to the indicated channel.
static void bridge_playfile (struct ast_channel *chan, struct ast_channel *peer, const char *sound, int remain)
static struct ast_channelchannel_find_locked (const struct ast_channel *prev, const char *name, const int namelen, const char *context, const char *exten)
 Helper function to find channels.
const char * channelreloadreason2txt (enum channelreloadreason reason)
 Convert enum channelreloadreason to text string for manager event.
static void clone_variables (struct ast_channel *original, struct ast_channel *clone)
 Clone channel variables from 'clone' channel into 'original' channel.
static char * complete_channeltypes (const char *line, const char *word, int pos, int state)
static char * complete_channeltypes_deprecated (const char *line, const char *word, int pos, int state)
static void free_cid (struct ast_callerid *cid)
static void free_translation (struct ast_channel *clone)
static int generator_force (const void *data)
static int attribute_const is_visible_indication (enum ast_control_frame_type condition)
static void queue_dtmf_readq (struct ast_channel *chan, struct ast_frame *f)
static int set_format (struct ast_channel *chan, int fmt, int *rawformat, int *format, struct ast_trans_pvt **trans, const int direction)
static int should_skip_dtmf (struct ast_channel *chan)
 Determine whether or not we should ignore DTMF in the readq.
static int show_channeltype (int fd, int argc, char *argv[])
static int show_channeltype_deprecated (int fd, int argc, char *argv[])
static int show_channeltypes (int fd, int argc, char *argv[])
static void * silence_generator_alloc (struct ast_channel *chan, void *data)
static int silence_generator_generate (struct ast_channel *chan, void *data, int len, int samples)
static void silence_generator_release (struct ast_channel *chan, void *data)
static void state2str_threadbuf_init (void)
static void * tonepair_alloc (struct ast_channel *chan, void *params)
static int tonepair_generator (struct ast_channel *chan, void *data, int len, int samples)
static void tonepair_release (struct ast_channel *chan, void *params)

Variables

static void(*) ast_moh_cleanup_ptr (struct ast_channel *) = NULL
static int(*) ast_moh_start_ptr (struct ast_channel *, const char *, const char *) = NULL
static void(*) ast_moh_stop_ptr (struct ast_channel *) = NULL
ast_cause causes []
static struct ast_cli_entry cli_channel []
static struct ast_cli_entry cli_show_channeltype_deprecated
static struct ast_cli_entry cli_show_channeltypes_deprecated
unsigned long global_fin
unsigned long global_fout
static struct ast_channel_tech null_tech
static char show_channeltype_usage []
static char show_channeltypes_usage []
static int shutting_down
static struct ast_generator silence_generator
static struct ast_threadstorage state2str_threadbuf = { .once = PTHREAD_ONCE_INIT , .key_init = state2str_threadbuf_init , }
static struct ast_generator tonepair
static int uniqueint


Detailed Description

Channel Management.

Author:
Mark Spencer <markster@digium.com>

Definition in file channel.c.


Define Documentation

#define AST_DEFAULT_EMULATE_DTMF_DURATION   100

Default amount of time to use when emulating a digit as a begin and end 100ms

Definition at line 89 of file channel.c.

Referenced by __ast_read(), and ast_senddigit().

#define AST_MIN_DTMF_DURATION   80

Minimum allowed digit length - 80ms

Definition at line 92 of file channel.c.

Referenced by __ast_read().

#define AST_MIN_DTMF_GAP   45

Minimum amount of time between the end of the last digit and the beginning of a new one - 45ms

Definition at line 96 of file channel.c.

Referenced by __ast_read(), and should_skip_dtmf().

#define FORMAT   "%-10.10s %-40.40s %-12.12s %-12.12s %-12.12s\n"

#define MONITOR_CONSTANT_DELAY

Definition at line 74 of file channel.c.

#define MONITOR_DELAY   150 * 8

Definition at line 75 of file channel.c.

Referenced by __ast_read(), and ast_write().

#define STATE2STR_BUFSIZE   32

Definition at line 85 of file channel.c.

Referenced by ast_state2str().


Function Documentation

static int __ast_queue_frame ( struct ast_channel chan,
struct ast_frame fin,
int  head 
) [static]

Queue an outgoing media frame.

Definition at line 897 of file channel.c.

References ast_channel::alertpipe, ast_assert, ast_channel_lock, ast_channel_unlock, AST_CONTROL_HANGUP, AST_FLAG_BLOCKING, AST_FRAME_CONTROL, AST_FRAME_VOICE, ast_frdup(), ast_frfree, AST_LIST_INSERT_HEAD, AST_LIST_INSERT_TAIL, AST_LIST_LAST, AST_LIST_TRAVERSE, ast_log(), ast_test_flag, ast_channel::blocker, errno, f, ast_frame::frame_list, ast_frame::frametype, LOG_DEBUG, ast_channel::name, option_debug, ast_channel::readq, ast_frame::subclass, and ast_channel::timingfd.

Referenced by ast_queue_frame(), and ast_queue_frame_head().

00898 {
00899    struct ast_frame *f;
00900    struct ast_frame *cur;
00901    int blah = 1;
00902    int qlen = 0;
00903 
00904    /* Build us a copy and free the original one */
00905    if (!(f = ast_frdup(fin))) {
00906       return -1;
00907    }
00908 
00909    ast_channel_lock(chan);
00910 
00911    /* See if the last frame on the queue is a hangup, if so don't queue anything */
00912    if ((cur = AST_LIST_LAST(&chan->readq)) && (cur->frametype == AST_FRAME_CONTROL) && (cur->subclass == AST_CONTROL_HANGUP)) {
00913       ast_frfree(f);
00914       ast_channel_unlock(chan);
00915       return 0;
00916    }
00917 
00918    /* Count how many frames exist on the queue */
00919    AST_LIST_TRAVERSE(&chan->readq, cur, frame_list) {
00920       qlen++;
00921    }
00922 
00923    /* Allow up to 96 voice frames outstanding, and up to 128 total frames */
00924    if (((fin->frametype == AST_FRAME_VOICE) && (qlen > 96)) || (qlen  > 128)) {
00925       if (fin->frametype != AST_FRAME_VOICE) {
00926          ast_log(LOG_WARNING, "Exceptionally long queue length queuing to %s\n", chan->name);
00927          ast_assert(fin->frametype == AST_FRAME_VOICE);
00928       } else {
00929          if (option_debug)
00930             ast_log(LOG_DEBUG, "Dropping voice to exceptionally long queue on %s\n", chan->name);
00931          ast_frfree(f);
00932          ast_channel_unlock(chan);
00933          return 0;
00934       }
00935    }
00936 
00937    if (head) {
00938       AST_LIST_INSERT_HEAD(&chan->readq, f, frame_list);
00939    } else {
00940       AST_LIST_INSERT_TAIL(&chan->readq, f, frame_list);
00941    }
00942 
00943    if (chan->alertpipe[1] > -1) {
00944       if (write(chan->alertpipe[1], &blah, sizeof(blah)) != sizeof(blah)) {
00945          ast_log(LOG_WARNING, "Unable to write to alert pipe on %s, frametype/subclass %d/%d (qlen = %d): %s!\n",
00946             chan->name, f->frametype, f->subclass, qlen, strerror(errno));
00947       }
00948 #ifdef HAVE_DAHDI
00949    } else if (chan->timingfd > -1) {
00950       ioctl(chan->timingfd, DAHDI_TIMERPING, &blah);
00951 #endif            
00952    } else if (ast_test_flag(chan, AST_FLAG_BLOCKING)) {
00953       pthread_kill(chan->blocker, SIGURG);
00954    }
00955 
00956    ast_channel_unlock(chan);
00957 
00958    return 0;
00959 }

static struct ast_frame* __ast_read ( struct ast_channel chan,
int  dropaudio 
) [static]

Definition at line 2022 of file channel.c.

References ast_channel::_softhangup, ast_channel::_state, ast_channel::alertpipe, AST_AUDIOHOOK_DIRECTION_READ, ast_audiohook_write_list(), ast_channel_trylock, ast_channel_unlock, ast_check_hangup(), ast_clear_flag, AST_CONTROL_ANSWER, AST_CONTROL_HANGUP, ast_deactivate_generator(), AST_DEFAULT_EMULATE_DTMF_DURATION, ast_do_masquerade(), AST_FLAG_DEFER_DTMF, AST_FLAG_EMULATE_DTMF, AST_FLAG_END_DTMF_ONLY, AST_FLAG_EXCEPTION, AST_FLAG_IN_DTMF, AST_FLAG_OUTGOING, AST_FLAG_ZOMBIE, AST_FRAME_CONTROL, AST_FRAME_DTMF_BEGIN, AST_FRAME_DTMF_END, ast_frame_dump(), AST_FRAME_NULL, AST_FRAME_VOICE, ast_frfree, AST_GENERATOR_FD, ast_getformatname(), ast_getformatname_multiple(), AST_LIST_EMPTY, AST_LIST_FIRST, AST_LIST_HEAD_SET_NOLOCK, AST_LIST_NEXT, AST_LIST_REMOVE_CURRENT, AST_LIST_TRAVERSE_SAFE_BEGIN, AST_LIST_TRAVERSE_SAFE_END, ast_log(), AST_MIN_DTMF_DURATION, AST_MIN_DTMF_GAP, AST_MONITOR_RUNNING, ast_null_frame, ast_read_generator_actions(), ast_seekstream(), ast_set_flag, ast_setstate(), AST_SOFTHANGUP_DEV, AST_STATE_UP, ast_test_flag, AST_TIMING_FD, ast_translate(), ast_tvdiff_ms(), ast_tvnow(), ast_tvzero(), ast_writestream(), ast_channel::audiohooks, ast_channel::blocker, ast_frame::data, DEBUGCHAN_FLAG, ast_channel::dtmf_tv, ast_channel::dtmff, ast_channel::emulate_dtmf_digit, ast_channel::emulate_dtmf_duration, errno, ast_channel_tech::exception, f, ast_channel::fdno, ast_channel::fds, ast_channel::fin, ast_frame::flags, ast_frame::frame_list, FRAMECOUNT_INC, ast_frame::frametype, ast_generator::generate, ast_channel::generator, ast_channel::generatordata, ast_channel::insmpl, LOG_DEBUG, LOG_DTMF, LOG_ERROR, LOG_NOTICE, ast_channel::masq, ast_channel::monitor, MONITOR_DELAY, ast_channel::name, ast_channel::nativeformats, option_debug, ast_channel::outsmpl, queue_dtmf_readq(), ast_channel_tech::read, ast_channel_monitor::read_stream, ast_channel::readq, ast_channel::readtrans, SEEK_FORCECUR, should_skip_dtmf(), ast_channel_monitor::state, ast_channel::tech, ast_channel::timingdata, ast_channel::timingfd, and ast_channel::timingfunc.

Referenced by ast_read(), and ast_read_noaudio().

02023 {
02024    struct ast_frame *f = NULL;   /* the return value */
02025    int blah;
02026    int prestate;
02027    int count = 0;
02028 
02029    /* this function is very long so make sure there is only one return
02030     * point at the end (there are only two exceptions to this).
02031     */
02032    while(ast_channel_trylock(chan)) {
02033       if(count++ > 10) 
02034          /*cannot goto done since the channel is not locked*/
02035          return &ast_null_frame;
02036       usleep(1);
02037    }
02038 
02039    if (chan->masq) {
02040       if (ast_do_masquerade(chan))
02041          ast_log(LOG_WARNING, "Failed to perform masquerade\n");
02042       else
02043          f =  &ast_null_frame;
02044       goto done;
02045    }
02046 
02047    /* Stop if we're a zombie or need a soft hangup */
02048    if (ast_test_flag(chan, AST_FLAG_ZOMBIE) || ast_check_hangup(chan)) {
02049       if (chan->generator)
02050          ast_deactivate_generator(chan);
02051       goto done;
02052    }
02053    prestate = chan->_state;
02054 
02055    /* Read and ignore anything on the alertpipe, but read only
02056       one sizeof(blah) per frame that we send from it */
02057    if (chan->alertpipe[0] > -1) {
02058       int flags = fcntl(chan->alertpipe[0], F_GETFL);
02059       /* For some odd reason, the alertpipe occasionally loses nonblocking status,
02060        * which immediately causes a deadlock scenario.  Detect and prevent this. */
02061       if ((flags & O_NONBLOCK) == 0) {
02062          ast_log(LOG_ERROR, "Alertpipe on channel %s lost O_NONBLOCK?!!\n", chan->name);
02063          if (fcntl(chan->alertpipe[0], F_SETFL, flags | O_NONBLOCK) < 0) {
02064             ast_log(LOG_WARNING, "Unable to set alertpipe nonblocking! (%d: %s)\n", errno, strerror(errno));
02065             f = &ast_null_frame;
02066             goto done;
02067          }
02068       }
02069       if (read(chan->alertpipe[0], &blah, sizeof(blah)) < 0) {
02070          if (errno != EINTR && errno != EAGAIN)
02071             ast_log(LOG_WARNING, "read() failed: %s\n", strerror(errno));
02072       }
02073    }
02074 
02075 #ifdef HAVE_DAHDI
02076    if (chan->timingfd > -1 && chan->fdno == AST_TIMING_FD && ast_test_flag(chan, AST_FLAG_EXCEPTION)) {
02077       int res;
02078 
02079       ast_clear_flag(chan, AST_FLAG_EXCEPTION);
02080       blah = -1;
02081       /* IF we can't get event, assume it's an expired as-per the old interface */
02082       res = ioctl(chan->timingfd, DAHDI_GETEVENT, &blah);
02083       if (res)
02084          blah = DAHDI_EVENT_TIMER_EXPIRED;
02085 
02086       if (blah == DAHDI_EVENT_TIMER_PING) {
02087          if (AST_LIST_EMPTY(&chan->readq) || !AST_LIST_NEXT(AST_LIST_FIRST(&chan->readq), frame_list)) {
02088             /* Acknowledge PONG unless we need it again */
02089             if (ioctl(chan->timingfd, DAHDI_TIMERPONG, &blah)) {
02090                ast_log(LOG_WARNING, "Failed to pong timer on '%s': %s\n", chan->name, strerror(errno));
02091             }
02092          }
02093       } else if (blah == DAHDI_EVENT_TIMER_EXPIRED) {
02094          ioctl(chan->timingfd, DAHDI_TIMERACK, &blah);
02095          if (chan->timingfunc) {
02096             /* save a copy of func/data before unlocking the channel */
02097             int (*func)(const void *) = chan->timingfunc;
02098             void *data = chan->timingdata;
02099             ast_channel_unlock(chan);
02100             func(data);
02101          } else {
02102             blah = 0;
02103             ioctl(chan->timingfd, DAHDI_TIMERCONFIG, &blah);
02104             chan->timingdata = NULL;
02105             ast_channel_unlock(chan);
02106          }
02107          /* cannot 'goto done' because the channel is already unlocked */
02108          return &ast_null_frame;
02109       } else
02110          ast_log(LOG_NOTICE, "No/unknown event '%d' on timer for '%s'?\n", blah, chan->name);
02111    } else
02112 #endif
02113    if (chan->fds[AST_GENERATOR_FD] > -1 && chan->fdno == AST_GENERATOR_FD) {
02114       /* if the AST_GENERATOR_FD is set, call the generator with args
02115        * set to -1 so it can do whatever it needs to.
02116        */
02117       void *tmp = chan->generatordata;
02118       chan->generatordata = NULL;     /* reset to let ast_write get through */
02119       chan->generator->generate(chan, tmp, -1, -1);
02120       chan->generatordata = tmp;
02121       f = &ast_null_frame;
02122       goto done;
02123    }
02124 
02125    /* Check for pending read queue */
02126    if (!AST_LIST_EMPTY(&chan->readq)) {
02127       int skip_dtmf = should_skip_dtmf(chan);
02128 
02129       AST_LIST_TRAVERSE_SAFE_BEGIN(&chan->readq, f, frame_list) {
02130          /* We have to be picky about which frame we pull off of the readq because
02131           * there are cases where we want to leave DTMF frames on the queue until
02132           * some later time. */
02133 
02134          if ( (f->frametype == AST_FRAME_DTMF_BEGIN || f->frametype == AST_FRAME_DTMF_END) && skip_dtmf) {
02135             continue;
02136          }
02137 
02138          AST_LIST_REMOVE_CURRENT(&chan->readq, frame_list);
02139          break;
02140       }
02141       AST_LIST_TRAVERSE_SAFE_END
02142       
02143       if (!f) {
02144          /* There were no acceptable frames on the readq. */
02145          f = &ast_null_frame;
02146          if (chan->alertpipe[0] > -1) {
02147             int poke = 0;
02148             /* Restore the state of the alertpipe since we aren't ready for any
02149              * of the frames in the readq. */
02150             if (write(chan->alertpipe[1], &poke, sizeof(poke)) != sizeof(poke)) {
02151                ast_log(LOG_ERROR, "Failed to write to alertpipe: %s\n", strerror(errno));
02152             }
02153          }
02154       }
02155 
02156       /* Interpret hangup and return NULL */
02157       /* XXX why not the same for frames from the channel ? */
02158       if (f->frametype == AST_FRAME_CONTROL && f->subclass == AST_CONTROL_HANGUP) {
02159          ast_frfree(f);
02160          f = NULL;
02161       }
02162    } else {
02163       chan->blocker = pthread_self();
02164       if (ast_test_flag(chan, AST_FLAG_EXCEPTION)) {
02165          if (chan->tech->exception)
02166             f = chan->tech->exception(chan);
02167          else {
02168             ast_log(LOG_WARNING, "Exception flag set on '%s', but no exception handler\n", chan->name);
02169             f = &ast_null_frame;
02170          }
02171          /* Clear the exception flag */
02172          ast_clear_flag(chan, AST_FLAG_EXCEPTION);
02173       } else if (chan->tech->read)
02174          f = chan->tech->read(chan);
02175       else
02176          ast_log(LOG_WARNING, "No read routine on channel %s\n", chan->name);
02177    }
02178 
02179    if (f) {
02180       /* if the channel driver returned more than one frame, stuff the excess
02181          into the readq for the next ast_read call (note that we can safely assume
02182          that the readq is empty, because otherwise we would not have called into
02183          the channel driver and f would be only a single frame)
02184       */
02185       if (AST_LIST_NEXT(f, frame_list)) {
02186          AST_LIST_HEAD_SET_NOLOCK(&chan->readq, AST_LIST_NEXT(f, frame_list));
02187          AST_LIST_NEXT(f, frame_list) = NULL;
02188       }
02189 
02190       switch (f->frametype) {
02191       case AST_FRAME_CONTROL:
02192          if (f->subclass == AST_CONTROL_ANSWER) {
02193             if (!ast_test_flag(chan, AST_FLAG_OUTGOING)) {
02194                if (option_debug)
02195                   ast_log(LOG_DEBUG, "Ignoring answer on an inbound call!\n");
02196                ast_frfree(f);
02197                f = &ast_null_frame;
02198             } else if (prestate == AST_STATE_UP) {
02199                if (option_debug)
02200                   ast_log(LOG_DEBUG, "Dropping duplicate answer!\n");
02201                ast_frfree(f);
02202                f = &ast_null_frame;
02203             } else {
02204                /* Answer the CDR */
02205                ast_setstate(chan, AST_STATE_UP);
02206                /* removed a call to ast_cdr_answer(chan->cdr) from here. */
02207             }
02208          }
02209          break;
02210       case AST_FRAME_DTMF_END:
02211          ast_log(LOG_DTMF, "DTMF end '%c' received on %s, duration %ld ms\n", f->subclass, chan->name, f->len);
02212          /* Queue it up if DTMF is deferred, or if DTMF emulation is forced. */
02213          if (ast_test_flag(chan, AST_FLAG_DEFER_DTMF) || ast_test_flag(chan, AST_FLAG_EMULATE_DTMF)) {
02214             queue_dtmf_readq(chan, f);
02215             ast_frfree(f);
02216             f = &ast_null_frame;
02217          } else if (!ast_test_flag(chan, AST_FLAG_IN_DTMF | AST_FLAG_END_DTMF_ONLY)) {
02218             if (!ast_tvzero(chan->dtmf_tv) && 
02219                 ast_tvdiff_ms(ast_tvnow(), chan->dtmf_tv) < AST_MIN_DTMF_GAP) {
02220                /* If it hasn't been long enough, defer this digit */
02221                queue_dtmf_readq(chan, f);
02222                ast_frfree(f);
02223                f = &ast_null_frame;
02224             } else {
02225                /* There was no begin, turn this into a begin and send the end later */
02226                f->frametype = AST_FRAME_DTMF_BEGIN;
02227                ast_set_flag(chan, AST_FLAG_EMULATE_DTMF);
02228                chan->emulate_dtmf_digit = f->subclass;
02229                chan->dtmf_tv = ast_tvnow();
02230                if (f->len) {
02231                   if (f->len > AST_MIN_DTMF_DURATION)
02232                      chan->emulate_dtmf_duration = f->len;
02233                   else 
02234                      chan->emulate_dtmf_duration = AST_MIN_DTMF_DURATION;
02235                } else
02236                   chan->emulate_dtmf_duration = AST_DEFAULT_EMULATE_DTMF_DURATION;
02237                ast_log(LOG_DTMF, "DTMF begin emulation of '%c' with duration %u queued on %s\n", f->subclass, chan->emulate_dtmf_duration, chan->name);
02238             }
02239             if (chan->audiohooks) {
02240                struct ast_frame *old_frame = f;
02241                f = ast_audiohook_write_list(chan, chan->audiohooks, AST_AUDIOHOOK_DIRECTION_READ, f);
02242                if (old_frame != f)
02243                   ast_frfree(old_frame);
02244                                 }
02245          } else {
02246             struct timeval now = ast_tvnow();
02247             if (ast_test_flag(chan, AST_FLAG_IN_DTMF)) {
02248                ast_log(LOG_DTMF, "DTMF end accepted with begin '%c' on %s\n", f->subclass, chan->name);
02249                ast_clear_flag(chan, AST_FLAG_IN_DTMF);
02250                if (!f->len)
02251                   f->len = ast_tvdiff_ms(now, chan->dtmf_tv);
02252             } else if (!f->len) {
02253                ast_log(LOG_DTMF, "DTMF end accepted without begin '%c' on %s\n", f->subclass, chan->name);
02254                f->len = AST_MIN_DTMF_DURATION;
02255             }
02256             if (f->len < AST_MIN_DTMF_DURATION && !ast_test_flag(chan, AST_FLAG_END_DTMF_ONLY)) {
02257                ast_log(LOG_DTMF, "DTMF end '%c' has duration %ld but want minimum %d, emulating on %s\n", f->subclass, f->len, AST_MIN_DTMF_DURATION, chan->name);
02258                ast_set_flag(chan, AST_FLAG_EMULATE_DTMF);
02259                chan->emulate_dtmf_digit = f->subclass;
02260                chan->emulate_dtmf_duration = AST_MIN_DTMF_DURATION - f->len;
02261                ast_frfree(f);
02262                f = &ast_null_frame;
02263             } else {
02264                ast_log(LOG_DTMF, "DTMF end passthrough '%c' on %s\n", f->subclass, chan->name);
02265                if (f->len < AST_MIN_DTMF_DURATION) {
02266                   f->len = AST_MIN_DTMF_DURATION;
02267                }
02268                chan->dtmf_tv = now;
02269             }
02270             if (chan->audiohooks) {
02271                struct ast_frame *old_frame = f;
02272                f = ast_audiohook_write_list(chan, chan->audiohooks, AST_AUDIOHOOK_DIRECTION_READ, f);
02273                if (old_frame != f)
02274                   ast_frfree(old_frame);
02275             }
02276          }
02277          break;
02278       case AST_FRAME_DTMF_BEGIN:
02279          ast_log(LOG_DTMF, "DTMF begin '%c' received on %s\n", f->subclass, chan->name);
02280          if ( ast_test_flag(chan, AST_FLAG_DEFER_DTMF | AST_FLAG_END_DTMF_ONLY | AST_FLAG_EMULATE_DTMF) || 
02281              (!ast_tvzero(chan->dtmf_tv) && 
02282                ast_tvdiff_ms(ast_tvnow(), chan->dtmf_tv) < AST_MIN_DTMF_GAP) ) {
02283             ast_log(LOG_DTMF, "DTMF begin ignored '%c' on %s\n", f->subclass, chan->name);
02284             ast_frfree(f);
02285             f = &ast_null_frame;
02286          } else {
02287             ast_set_flag(chan, AST_FLAG_IN_DTMF);
02288             chan->dtmf_tv = ast_tvnow();
02289             ast_log(LOG_DTMF, "DTMF begin passthrough '%c' on %s\n", f->subclass, chan->name);
02290          }
02291          break;
02292       case AST_FRAME_NULL:
02293          /* The EMULATE_DTMF flag must be cleared here as opposed to when the duration
02294           * is reached , because we want to make sure we pass at least one
02295           * voice frame through before starting the next digit, to ensure a gap
02296           * between DTMF digits. */
02297          if (ast_test_flag(chan, AST_FLAG_EMULATE_DTMF)) {
02298             struct timeval now = ast_tvnow();
02299             if (!chan->emulate_dtmf_duration) {
02300                ast_clear_flag(chan, AST_FLAG_EMULATE_DTMF);
02301                chan->emulate_dtmf_digit = 0;
02302             } else if (ast_tvdiff_ms(now, chan->dtmf_tv) >= chan->emulate_dtmf_duration) {
02303                chan->emulate_dtmf_duration = 0;
02304                ast_frfree(f);
02305                f = &chan->dtmff;
02306                f->frametype = AST_FRAME_DTMF_END;
02307                f->subclass = chan->emulate_dtmf_digit;
02308                f->len = ast_tvdiff_ms(now, chan->dtmf_tv);
02309                chan->dtmf_tv = now;
02310                ast_clear_flag(chan, AST_FLAG_EMULATE_DTMF);
02311                chan->emulate_dtmf_digit = 0;
02312                ast_log(LOG_DTMF, "DTMF end emulation of '%c' queued on %s\n", f->subclass, chan->name);
02313             }
02314          }
02315          break;
02316       case AST_FRAME_VOICE:
02317          /* The EMULATE_DTMF flag must be cleared here as opposed to when the duration
02318           * is reached , because we want to make sure we pass at least one
02319           * voice frame through before starting the next digit, to ensure a gap
02320           * between DTMF digits. */
02321          if (ast_test_flag(chan, AST_FLAG_EMULATE_DTMF) && !chan->emulate_dtmf_duration) {
02322             ast_clear_flag(chan, AST_FLAG_EMULATE_DTMF);
02323             chan->emulate_dtmf_digit = 0;
02324          }
02325 
02326          if (dropaudio || ast_test_flag(chan, AST_FLAG_IN_DTMF)) {
02327             if (dropaudio)
02328                ast_read_generator_actions(chan, f);
02329             ast_frfree(f);
02330             f = &ast_null_frame;
02331          }
02332 
02333          if (ast_test_flag(chan, AST_FLAG_EMULATE_DTMF) && !ast_test_flag(chan, AST_FLAG_IN_DTMF)) {
02334             struct timeval now = ast_tvnow();
02335             if (ast_tvdiff_ms(now, chan->dtmf_tv) >= chan->emulate_dtmf_duration) {
02336                chan->emulate_dtmf_duration = 0;
02337                ast_frfree(f);
02338                f = &chan->dtmff;
02339                f->frametype = AST_FRAME_DTMF_END;
02340                f->subclass = chan->emulate_dtmf_digit;
02341                f->len = ast_tvdiff_ms(now, chan->dtmf_tv);
02342                chan->dtmf_tv = now;
02343                if (chan->audiohooks) {
02344                   struct ast_frame *old_frame = f;
02345                   f = ast_audiohook_write_list(chan, chan->audiohooks, AST_AUDIOHOOK_DIRECTION_READ, f);
02346                   if (old_frame != f)
02347                      ast_frfree(old_frame);
02348                }
02349                ast_log(LOG_DTMF, "DTMF end emulation of '%c' queued on %s\n", f->subclass, chan->name);
02350             } else {
02351                /* Drop voice frames while we're still in the middle of the digit */
02352                ast_frfree(f);
02353                f = &ast_null_frame;
02354             }
02355          } else if ((f->frametype == AST_FRAME_VOICE) && !(f->subclass & chan->nativeformats)) {
02356             /* This frame is not one of the current native formats -- drop it on the floor */
02357             char to[200];
02358             ast_log(LOG_NOTICE, "Dropping incompatible voice frame on %s of format %s since our native format has changed to %s\n",
02359                chan->name, ast_getformatname(f->subclass), ast_getformatname_multiple(to, sizeof(to), chan->nativeformats));
02360             ast_frfree(f);
02361             f = &ast_null_frame;
02362          } else if ((f->frametype == AST_FRAME_VOICE)) {
02363             if (chan->audiohooks) {
02364                struct ast_frame *old_frame = f;
02365                f = ast_audiohook_write_list(chan, chan->audiohooks, AST_AUDIOHOOK_DIRECTION_READ, f);
02366                if (old_frame != f)
02367                   ast_frfree(old_frame);
02368             }
02369             if (chan->monitor && chan->monitor->read_stream ) {
02370                /* XXX what does this do ? */
02371 #ifndef MONITOR_CONSTANT_DELAY
02372                int jump = chan->outsmpl - chan->insmpl - 4 * f->samples;
02373                if (jump >= 0) {
02374                   jump = chan->outsmpl - chan->insmpl;
02375                   if (ast_seekstream(chan->monitor->read_stream, jump, SEEK_FORCECUR) == -1)
02376                      ast_log(LOG_WARNING, "Failed to perform seek in monitoring read stream, synchronization between the files may be broken\n");
02377                   chan->insmpl += jump + f->samples;
02378                } else
02379                   chan->insmpl+= f->samples;
02380 #else
02381                int jump = chan->outsmpl - chan->insmpl;
02382                if (jump - MONITOR_DELAY >= 0) {
02383                   if (ast_seekstream(chan->monitor->read_stream, jump - f->samples, SEEK_FORCECUR) == -1)
02384                      ast_log(LOG_WARNING, "Failed to perform seek in monitoring read stream, synchronization between the files may be broken\n");
02385                   chan->insmpl += jump;
02386                } else
02387                   chan->insmpl += f->samples;
02388 #endif
02389                if (chan->monitor->state == AST_MONITOR_RUNNING) {
02390                   if (ast_writestream(chan->monitor->read_stream, f) < 0)
02391                      ast_log(LOG_WARNING, "Failed to write data to channel monitor read stream\n");
02392                }
02393             }
02394 
02395             if (chan->readtrans && (f = ast_translate(chan->readtrans, f, 1)) == NULL)
02396                f = &ast_null_frame;
02397 
02398             /* Run generator sitting on the line if timing device not available
02399             * and synchronous generation of outgoing frames is necessary       */
02400             ast_read_generator_actions(chan, f);
02401          }
02402       default:
02403          /* Just pass it on! */
02404          break;
02405       }
02406    } else {
02407       /* Make sure we always return NULL in the future */
02408       chan->_softhangup |= AST_SOFTHANGUP_DEV;
02409       if (chan->generator)
02410          ast_deactivate_generator(chan);
02411       /* We no longer End the CDR here */
02412    }
02413 
02414    /* High bit prints debugging */
02415    if (chan->fin & DEBUGCHAN_FLAG)
02416       ast_frame_dump(chan->name, f, "<<");
02417    chan->fin = FRAMECOUNT_INC(chan->fin);
02418 
02419 done:
02420    ast_channel_unlock(chan);
02421    return f;
02422 }

struct ast_channel* __ast_request_and_dial ( const char *  type,
int  format,
void *  data,
int  timeout,
int *  outstate,
const char *  cid_num,
const char *  cid_name,
struct outgoing_helper oh 
)

Definition at line 3000 of file channel.c.

References ast_channel::_state, outgoing_helper::account, ast_call(), AST_CAUSE_BUSY, AST_CAUSE_CONGESTION, AST_CAUSE_NO_ANSWER, ast_cdr_alloc(), ast_cdr_disposition(), ast_cdr_end(), ast_cdr_failed(), ast_cdr_init(), ast_cdr_setaccount(), ast_cdr_setapp(), ast_cdr_start(), ast_cdr_update(), ast_channel_inherit_variables(), AST_CONTROL_ANSWER, AST_CONTROL_BUSY, AST_CONTROL_CONGESTION, AST_CONTROL_HANGUP, AST_CONTROL_HOLD, AST_CONTROL_PROCEEDING, AST_CONTROL_PROGRESS, AST_CONTROL_RINGING, AST_CONTROL_SRCUPDATE, AST_CONTROL_UNHOLD, AST_CONTROL_VIDUPDATE, ast_copy_string(), AST_FRAME_CONTROL, ast_frfree, ast_hangup(), ast_log(), ast_read(), ast_request(), ast_set_callerid(), ast_set_variables(), AST_STATE_UP, ast_strlen_zero(), ast_waitfor(), ast_channel::cdr, outgoing_helper::cid_name, outgoing_helper::cid_num, outgoing_helper::context, ast_channel::context, outgoing_helper::exten, ast_channel::exten, f, ast_channel::hangupcause, LOG_NOTICE, outgoing_helper::parent_channel, outgoing_helper::priority, ast_channel::priority, and outgoing_helper::vars.

Referenced by ast_pbx_outgoing_app(), ast_pbx_outgoing_exten(), ast_request_and_dial(), and parkandannounce_exec().

03001 {
03002    int dummy_outstate;
03003    int cause = 0;
03004    struct ast_channel *chan;
03005    int res = 0;
03006    int last_subclass = 0;
03007    
03008    if (outstate)
03009       *outstate = 0;
03010    else
03011       outstate = &dummy_outstate;   /* make outstate always a valid pointer */
03012 
03013    chan = ast_request(type, format, data, &cause);
03014    if (!chan) {
03015       ast_log(LOG_NOTICE, "Unable to request channel %s/%s\n", type, (char *)data);
03016       /* compute error and return */
03017       if (cause == AST_CAUSE_BUSY)
03018          *outstate = AST_CONTROL_BUSY;
03019       else if (cause == AST_CAUSE_CONGESTION)
03020          *outstate = AST_CONTROL_CONGESTION;
03021       return NULL;
03022    }
03023 
03024    if (oh) {
03025       if (oh->vars)  
03026          ast_set_variables(chan, oh->vars);
03027       /* XXX why is this necessary, for the parent_channel perhaps ? */
03028       if (!ast_strlen_zero(oh->cid_num) && !ast_strlen_zero(oh->cid_name))
03029          ast_set_callerid(chan, oh->cid_num, oh->cid_name, oh->cid_num);
03030       if (oh->parent_channel)
03031          ast_channel_inherit_variables(oh->parent_channel, chan);
03032       if (oh->account)
03033          ast_cdr_setaccount(chan, oh->account); 
03034    }
03035    ast_set_callerid(chan, cid_num, cid_name, cid_num);
03036 
03037    if (ast_call(chan, data, 0)) {   /* ast_call failed... */
03038       ast_log(LOG_NOTICE, "Unable to call channel %s/%s\n", type, (char *)data);
03039    } else {
03040       res = 1; /* mark success in case chan->_state is already AST_STATE_UP */
03041       while (timeout && chan->_state != AST_STATE_UP) {
03042          struct ast_frame *f;
03043          res = ast_waitfor(chan, timeout);
03044          if (res <= 0) /* error, timeout, or done */
03045             break;
03046          if (timeout > -1)
03047             timeout = res;
03048          f = ast_read(chan);
03049          if (!f) {
03050             *outstate = AST_CONTROL_HANGUP;
03051             res = 0;
03052             break;
03053          }
03054          if (f->frametype == AST_FRAME_CONTROL) {
03055             switch (f->subclass) {
03056             case AST_CONTROL_RINGING:  /* record but keep going */
03057                *outstate = f->subclass;
03058                break;
03059 
03060             case AST_CONTROL_BUSY:
03061             case AST_CONTROL_CONGESTION:
03062             case AST_CONTROL_ANSWER:
03063                *outstate = f->subclass;
03064                timeout = 0;      /* trick to force exit from the while() */
03065                break;
03066 
03067             /* Ignore these */
03068             case AST_CONTROL_PROGRESS:
03069             case AST_CONTROL_PROCEEDING:
03070             case AST_CONTROL_HOLD:
03071             case AST_CONTROL_UNHOLD:
03072             case AST_CONTROL_VIDUPDATE:
03073             case AST_CONTROL_SRCUPDATE:
03074             case -1:       /* Ignore -- just stopping indications */
03075                break;
03076 
03077             default:
03078                ast_log(LOG_NOTICE, "Don't know what to do with control frame %d\n", f->subclass);
03079             }
03080             last_subclass = f->subclass;
03081          }
03082          ast_frfree(f);
03083       }
03084    }
03085 
03086    /* Final fixups */
03087    if (oh) {
03088       if (!ast_strlen_zero(oh->context))
03089          ast_copy_string(chan->context, oh->context, sizeof(chan->context));
03090       if (!ast_strlen_zero(oh->exten))
03091          ast_copy_string(chan->exten, oh->exten, sizeof(chan->exten));
03092       if (oh->priority) 
03093          chan->priority = oh->priority;
03094    }
03095    if (chan->_state == AST_STATE_UP)
03096       *outstate = AST_CONTROL_ANSWER;
03097 
03098    if (res <= 0) {
03099       if ( AST_CONTROL_RINGING == last_subclass ) 
03100          chan->hangupcause = AST_CAUSE_NO_ANSWER;
03101       if (!chan->cdr && (chan->cdr = ast_cdr_alloc()))
03102          ast_cdr_init(chan->cdr, chan);
03103       if (chan->cdr) {
03104          char tmp[256];
03105          snprintf(tmp, sizeof(tmp), "%s/%s", type, (char *)data);
03106          ast_cdr_setapp(chan->cdr,"Dial",tmp);
03107          ast_cdr_update(chan);
03108          ast_cdr_start(chan->cdr);
03109          ast_cdr_end(chan->cdr);
03110          /* If the cause wasn't handled properly */
03111          if (ast_cdr_disposition(chan->cdr,chan->hangupcause))
03112             ast_cdr_failed(chan->cdr);
03113       }
03114       ast_hangup(chan);
03115       chan = NULL;
03116    }
03117    return chan;
03118 }

int ast_activate_generator ( struct ast_channel chan,
struct ast_generator gen,
void *  params 
)

Activate a given generator

Definition at line 1632 of file channel.c.

References ast_generator::alloc, ast_channel_lock, ast_channel_unlock, ast_prod(), ast_settimeout(), gen, ast_channel::generator, generator_force(), ast_channel::generatordata, and ast_generator::release.

Referenced by app_exec(), ast_channel_start_silence_generator(), ast_linear_stream(), ast_playtones_start(), ast_tonepair_start(), channel_spy(), local_ast_moh_start(), and old_milliwatt_exec().

01633 {
01634    int res = 0;
01635 
01636    ast_channel_lock(chan);
01637 
01638    if (chan->generatordata) {
01639       if (chan->generator && chan->generator->release)
01640          chan->generator->release(chan, chan->generatordata);
01641       chan->generatordata = NULL;
01642    }
01643 
01644    ast_prod(chan);
01645    if (gen->alloc && !(chan->generatordata = gen->alloc(chan, params))) {
01646       res = -1;
01647    }
01648    
01649    if (!res) {
01650       ast_settimeout(chan, 160, generator_force, chan);
01651       chan->generator = gen;
01652    }
01653 
01654    ast_channel_unlock(chan);
01655 
01656    return res;
01657 }

int ast_active_channels ( void   ) 

returns number of active/allocated channels

Returns number of active/allocated channels

Definition at line 443 of file channel.c.

References AST_LIST_LOCK, AST_LIST_TRAVERSE, and AST_LIST_UNLOCK.

Referenced by action_corestatus(), dahdi_restart(), handle_show_settings(), and quit_handler().

00444 {
00445    struct ast_channel *c;
00446    int cnt = 0;
00447    AST_LIST_LOCK(&channels);
00448    AST_LIST_TRAVERSE(&channels, c, chan_list)
00449       cnt++;
00450    AST_LIST_UNLOCK(&channels);
00451    return cnt;
00452 }

int ast_answer ( struct ast_channel chan  ) 

Answer a ringing call.

Parameters:
chan channel to answer This function answers a channel and handles all necessary call setup functions.
Returns:
Returns 0 on success, -1 on failure

Definition at line 1553 of file channel.c.

References ast_channel::_state, ast_channel_tech::answer, ast_cdr_answer(), ast_channel_lock, ast_channel_unlock, ast_check_hangup(), AST_FLAG_OUTGOING, AST_FLAG_ZOMBIE, ast_indicate(), ast_setstate(), AST_STATE_RING, AST_STATE_RINGING, AST_STATE_UP, ast_test_flag, ast_channel::cdr, ast_channel::tech, and ast_channel::visible_indication.

Referenced by __login_exec(), agi_exec_full(), alarmreceiver_exec(), answer_trunk_chan(), app_exec(), ast_bridge_call(), ast_control_streamfile(), ast_pickup_call(), auth_exec(), background_detect_exec(), builtin_parkcall(), common_exec(), conf_exec(), count_exec(), dictate_exec(), directory_exec(), disa_exec(), exec(), features_answer(), handle_answer(), ices_exec(), old_milliwatt_exec(), park_call_exec(), park_exec(), pbx_builtin_answer(), pbx_builtin_background(), pickup_do(), playback_exec(), privacy_exec(), read_exec(), sayunixtime_exec(), send_waveform_to_channel(), skel_exec(), sla_station_exec(), speech_background(), testclient_exec(), testserver_exec(), vm_exec(), vm_execmain(), waitforsilence_exec(), and zapateller_exec().

01554 {
01555    int res = 0;
01556    ast_channel_lock(chan);
01557    /* You can't answer an outbound call */
01558    if (ast_test_flag(chan, AST_FLAG_OUTGOING)) {
01559       ast_channel_unlock(chan);
01560       return 0;
01561    }
01562    /* Stop if we're a zombie or need a soft hangup */
01563    if (ast_test_flag(chan, AST_FLAG_ZOMBIE) || ast_check_hangup(chan)) {
01564       ast_channel_unlock(chan);
01565       return -1;
01566    }
01567    switch(chan->_state) {
01568    case AST_STATE_RINGING:
01569    case AST_STATE_RING:
01570       if (chan->tech->answer)
01571          res = chan->tech->answer(chan);
01572       ast_setstate(chan, AST_STATE_UP);
01573       ast_cdr_answer(chan->cdr);
01574       break;
01575    case AST_STATE_UP:
01576       break;
01577    default:
01578       break;
01579    }
01580    ast_indicate(chan, -1);
01581    chan->visible_indication = 0;
01582    ast_channel_unlock(chan);
01583    return res;
01584 }

void ast_begin_shutdown ( int  hangup  ) 

Initiate system shutdown.

Initiate system shutdown -- prevents new channels from being allocated. If "hangup" is non-zero, all existing channels will receive soft hangups

Definition at line 430 of file channel.c.

References AST_LIST_LOCK, AST_LIST_TRAVERSE, AST_LIST_UNLOCK, ast_softhangup(), and AST_SOFTHANGUP_SHUTDOWN.

Referenced by quit_handler().

00431 {
00432    struct ast_channel *c;
00433    shutting_down = 1;
00434    if (hangup) {
00435       AST_LIST_LOCK(&channels);
00436       AST_LIST_TRAVERSE(&channels, c, chan_list)
00437          ast_softhangup(c, AST_SOFTHANGUP_SHUTDOWN);
00438       AST_LIST_UNLOCK(&channels);
00439    }
00440 }

int ast_best_codec ( int  fmts  ) 

Pick the best audio codec.

Pick the best codec

Okay, ulaw is used by all telephony equipment, so start with it

Unless of course, you're a silly European, so then prefer ALAW

G.722 is better then all below, but not as common as the above... so give ulaw and alaw priority

Okay, well, signed linear is easy to translate into other stuff

G.726 is standard ADPCM, in RFC3551 packing order

G.726 is standard ADPCM, in AAL2 packing order

ADPCM has great sound quality and is still pretty easy to translate

Okay, we're down to vocoders now, so pick GSM because it's small and easier to translate and sounds pretty good

iLBC is not too bad

Speex is free, but computationally more expensive than GSM

Ick, LPC10 sounds terrible, but at least we have code for it, if you're tacky enough to use it

G.729a is faster than 723 and slightly less expensive

Down to G.723.1 which is proprietary but at least designed for voice

Definition at line 655 of file channel.c.

References AST_FORMAT_ADPCM, AST_FORMAT_ALAW, AST_FORMAT_AUDIO_MASK, AST_FORMAT_G722, AST_FORMAT_G723_1, AST_FORMAT_G726, AST_FORMAT_G726_AAL2, AST_FORMAT_G729A, AST_FORMAT_GSM, AST_FORMAT_ILBC, AST_FORMAT_LPC10, AST_FORMAT_SLINEAR, AST_FORMAT_SPEEX, AST_FORMAT_ULAW, ast_log(), LOG_WARNING, and prefs.

Referenced by __login_exec(), __oh323_new(), agent_call(), ast_codec_choose(), ast_iax2_new(), do_atxfer(), echo_exec(), findmeexec(), gtalk_new(), handle_open_receive_channel_ack_message(), iax2_request(), local_new(), mgcp_new(), sip_new(), skinny_new(), socket_process(), and transmit_connect().

00656 {
00657    /* This just our opinion, expressed in code.  We are asked to choose
00658       the best codec to use, given no information */
00659    int x;
00660    static int prefs[] =
00661    {
00662       /*! Okay, ulaw is used by all telephony equipment, so start with it */
00663       AST_FORMAT_ULAW,
00664       /*! Unless of course, you're a silly European, so then prefer ALAW */
00665       AST_FORMAT_ALAW,
00666       /*! G.722 is better then all below, but not as common as the above... so give ulaw and alaw priority */
00667       AST_FORMAT_G722,
00668       /*! Okay, well, signed linear is easy to translate into other stuff */
00669       AST_FORMAT_SLINEAR,
00670       /*! G.726 is standard ADPCM, in RFC3551 packing order */
00671       AST_FORMAT_G726,
00672       /*! G.726 is standard ADPCM, in AAL2 packing order */
00673       AST_FORMAT_G726_AAL2,
00674       /*! ADPCM has great sound quality and is still pretty easy to translate */
00675       AST_FORMAT_ADPCM,
00676       /*! Okay, we're down to vocoders now, so pick GSM because it's small and easier to
00677           translate and sounds pretty good */
00678       AST_FORMAT_GSM,
00679       /*! iLBC is not too bad */
00680       AST_FORMAT_ILBC,
00681       /*! Speex is free, but computationally more expensive than GSM */
00682       AST_FORMAT_SPEEX,
00683       /*! Ick, LPC10 sounds terrible, but at least we have code for it, if you're tacky enough
00684           to use it */
00685       AST_FORMAT_LPC10,
00686       /*! G.729a is faster than 723 and slightly less expensive */
00687       AST_FORMAT_G729A,
00688       /*! Down to G.723.1 which is proprietary but at least designed for voice */
00689       AST_FORMAT_G723_1,
00690    };
00691 
00692    /* Strip out video */
00693    fmts &= AST_FORMAT_AUDIO_MASK;
00694    
00695    /* Find the first preferred codec in the format given */
00696    for (x=0; x < (sizeof(prefs) / sizeof(prefs[0]) ); x++)
00697       if (fmts & prefs[x])
00698          return prefs[x];
00699    ast_log(LOG_WARNING, "Don't know any of 0x%x formats\n", fmts);
00700    return 0;
00701 }

struct ast_channel* ast_bridged_channel ( struct ast_channel chan  ) 

Find bridged channel.

Parameters:
chan Current channel

Definition at line 3847 of file channel.c.

References ast_channel::_bridge, ast_channel_tech::bridged_channel, and ast_channel::tech.

Referenced by __dahdi_exception(), action_agents(), agents_show(), agents_show_online(), ast_bridge_call(), ast_channel_masquerade(), attempt_transfer(), cb_events(), check_bridge(), common_exec(), console_transfer(), console_transfer_deprecated(), create_jb(), dahdi_handle_event(), dahdi_hangup(), export_aoc_vars(), handle_chanlist(), handle_chanlist_deprecated(), handle_hd_hf(), handle_invite_replaces(), handle_request(), handle_request_bye(), handle_request_info(), handle_request_invite(), handle_request_refer(), handle_response_invite(), handle_showchan(), handle_showchan_deprecated(), local_attended_transfer(), mgcp_hangup(), mgcp_ss(), misdn_transfer_bc(), mixmonitor_thread(), park_call_full(), schedule_delivery(), sip_read(), socket_process(), ss_thread(), start_spying(), and startmon().

03848 {
03849    struct ast_channel *bridged;
03850    bridged = chan->_bridge;
03851    if (bridged && bridged->tech->bridged_channel)
03852       bridged = bridged->tech->bridged_channel(chan, bridged);
03853    return bridged;
03854 }

int ast_call ( struct ast_channel chan,
char *  addr,
int  timeout 
)

Make a call.

Parameters:
chan which channel to make the call on
addr destination of the call
timeout time to wait on for connect Place a call, take no longer than timeout ms.
Returns:
Returns -1 on failure, 0 on not enough time (does not automatically stop ringing), and the number of seconds the connect took otherwise.

Definition at line 3175 of file channel.c.

References AST_CDR_FLAG_DIALED, ast_channel_lock, ast_channel_unlock, ast_check_hangup(), AST_FLAG_OUTGOING, AST_FLAG_ZOMBIE, ast_set_flag, ast_test_flag, ast_channel_tech::call, ast_channel::cdr, and ast_channel::tech.

Referenced by __ast_request_and_dial(), agent_call(), ast_feature_request_and_dial(), attempt_reconnect(), begin_dial(), connect_link(), do_idle_thread(), features_call(), findmeexec(), ring_entry(), rpt(), and wait_for_answer().

03176 {
03177    /* Place an outgoing call, but don't wait any longer than timeout ms before returning.
03178       If the remote end does not answer within the timeout, then do NOT hang up, but
03179       return anyway.  */
03180    int res = -1;
03181    /* Stop if we're a zombie or need a soft hangup */
03182    ast_channel_lock(chan);
03183    if (!ast_test_flag(chan, AST_FLAG_ZOMBIE) && !ast_check_hangup(chan)) {
03184       if (chan->cdr)
03185          ast_set_flag(chan->cdr, AST_CDR_FLAG_DIALED);
03186       if (chan->tech->call)
03187          res = chan->tech->call(chan, addr, timeout);
03188       ast_set_flag(chan, AST_FLAG_OUTGOING);
03189    }
03190    ast_channel_unlock(chan);
03191    return res;
03192 }

void ast_cancel_shutdown ( void   ) 

Cancel a shutdown in progress.

Cancels an existing shutdown and returns to normal operation

Definition at line 455 of file channel.c.

Referenced by handle_abort_halt().

00456 {
00457    shutting_down = 0;
00458 }

const char* ast_cause2str ( int  state  ) 

Gives the string form of a given hangup cause.

Parameters:
state cause to get the description of Give a name to a cause code Returns the text form of the binary cause code given

Definition at line 575 of file channel.c.

References causes, and desc.

Referenced by __transmit_response(), ast_do_masquerade(), ast_hangup(), findmeexec(), pbx_retrieve_variable(), sip_hangup(), and transmit_request_with_auth().

00576 {
00577    int x;
00578 
00579    for (x=0; x < sizeof(causes) / sizeof(causes[0]); x++) {
00580       if (causes[x].cause == cause)
00581          return causes[x].desc;
00582    }
00583 
00584    return "Unknown";
00585 }

void ast_change_name ( struct ast_channel chan,
char *  newname 
)

Change channel name.

Definition at line 3425 of file channel.c.

References ast_string_field_set, manager_event(), ast_channel::name, name, and ast_channel::uniqueid.

03426 {
03427    manager_event(EVENT_FLAG_CALL, "Rename", "Oldname: %s\r\nNewname: %s\r\nUniqueid: %s\r\n", chan->name, newname, chan->uniqueid);
03428    ast_string_field_set(chan, name, newname);
03429 }

struct ast_channel* ast_channel_alloc ( int  needqueue,
int  state,
const char *  cid_num,
const char *  cid_name,
const char *  acctcode,
const char *  exten,
const char *  context,
const int  amaflag,
const char *  name_fmt,
  ... 
)

Create a channel structure.

Returns:
Returns NULL on failure to allocate.
Note:
New channels are by default set to the "default" context and extension "s"

Definition at line 709 of file channel.c.

References ast_calloc, ast_log(), AST_MAX_FDS, ast_string_field_init, DAHDI_FILE_TIMER, ast_channel::flags, free, LOG_WARNING, sched_context_create(), and sched_context_destroy().

Referenced by __oh323_new(), acf_odbc_read(), acf_odbc_write(), action_getvar(), agent_new(), alsa_new(), ast_async_goto(), ast_iax2_new(), ast_pbx_outgoing_cdr_failed(), ast_pbx_outgoing_exten(), check_goto_on_transfer(), dahdi_new(), do_atxfer(), features_new(), gtalk_new(), iax_park(), local_new(), make_email_file(), masq_park_call(), mgcp_new(), misdn_new(), nbs_new(), oss_new(), pbx_substitute_variables_helper_full(), phone_new(), sendpage(), sip_new(), sip_park(), and skinny_new().

00710 {
00711    struct ast_channel *tmp;
00712    int x;
00713    int flags;
00714    struct varshead *headp;
00715    va_list ap1, ap2;
00716 
00717    /* If shutting down, don't allocate any new channels */
00718    if (shutting_down) {
00719       ast_log(LOG_WARNING, "Channel allocation failed: Refusing due to active shutdown\n");
00720       return NULL;
00721    }
00722 
00723    if (!(tmp = ast_calloc(1, sizeof(*tmp))))
00724       return NULL;
00725 
00726    if (!(tmp->sched = sched_context_create())) {
00727       ast_log(LOG_WARNING, "Channel allocation failed: Unable to create schedule context\n");
00728       free(tmp);
00729       return NULL;
00730    }
00731    
00732    if ((ast_string_field_init(tmp, 128))) {
00733       sched_context_destroy(tmp->sched);
00734       free(tmp);
00735       return NULL;
00736    }
00737 
00738    /* Don't bother initializing the last two FD here, because they
00739       will *always* be set just a few lines down (AST_TIMING_FD,
00740       AST_ALERT_FD). */
00741    for (x = 0; x < AST_MAX_FDS - 2; x++)
00742       tmp->fds[x] = -1;
00743 
00744 #ifdef HAVE_DAHDI
00745 
00746    tmp->timingfd = open(DAHDI_FILE_TIMER, O_RDWR);
00747 
00748    if (tmp->timingfd > -1) {
00749       /* Check if timing interface supports new
00750          ping/pong scheme */
00751       flags = 1;
00752       if (!ioctl(tmp->timingfd, DAHDI_TIMERPONG, &flags))
00753          needqueue = 0;
00754    }
00755 #else
00756    tmp->timingfd = -1;              
00757 #endif               
00758 
00759    if (needqueue) {
00760       if (pipe(tmp->alertpipe)) {
00761          ast_log(LOG_WARNING, "Channel allocation failed: Can't create alert pipe!\n");
00762 alertpipe_failed:
00763 #ifdef HAVE_DAHDI
00764          if (tmp->timingfd > -1)
00765             close(tmp->timingfd);
00766 #endif
00767          sched_context_destroy(tmp->sched);
00768          ast_string_field_free_memory(tmp);
00769          free(tmp);
00770          return NULL;
00771       } else {
00772          flags = fcntl(tmp->alertpipe[0], F_GETFL);
00773          if (fcntl(tmp->alertpipe[0], F_SETFL, flags | O_NONBLOCK) < 0) {
00774             ast_log(LOG_WARNING, "Channel allocation failed: Unable to set alertpipe nonblocking! (%d: %s)\n", errno, strerror(errno));
00775             close(tmp->alertpipe[0]);
00776             close(tmp->alertpipe[1]);
00777             goto alertpipe_failed;
00778          }
00779          flags = fcntl(tmp->alertpipe[1], F_GETFL);
00780          if (fcntl(tmp->alertpipe[1], F_SETFL, flags | O_NONBLOCK) < 0) {
00781             ast_log(LOG_WARNING, "Channel allocation failed: Unable to set alertpipe nonblocking! (%d: %s)\n", errno, strerror(errno));
00782             close(tmp->alertpipe[0]);
00783             close(tmp->alertpipe[1]);
00784             goto alertpipe_failed;
00785          }
00786       }
00787    } else   /* Make sure we've got it done right if they don't */
00788       tmp->alertpipe[0] = tmp->alertpipe[1] = -1;
00789 
00790    /* Always watch the alertpipe */
00791    tmp->fds[AST_ALERT_FD] = tmp->alertpipe[0];
00792    /* And timing pipe */
00793    tmp->fds[AST_TIMING_FD] = tmp->timingfd;
00794    ast_string_field_set(tmp, name, "**Unknown**");
00795 
00796    /* Initial state */
00797    tmp->_state = state;
00798 
00799    tmp->streamid = -1;
00800    
00801    tmp->fin = global_fin;
00802    tmp->fout = global_fout;
00803 
00804    if (ast_strlen_zero(ast_config_AST_SYSTEM_NAME)) {
00805       ast_string_field_build(tmp, uniqueid, "%li.%d", (long) time(NULL), 
00806          ast_atomic_fetchadd_int(&uniqueint, 1));
00807    } else {
00808       ast_string_field_build(tmp, uniqueid, "%s-%li.%d", ast_config_AST_SYSTEM_NAME, 
00809          (long) time(NULL), ast_atomic_fetchadd_int(&uniqueint, 1));
00810    }
00811 
00812    tmp->cid.cid_name = ast_strdup(cid_name);
00813    tmp->cid.cid_num = ast_strdup(cid_num);
00814    
00815    if (!ast_strlen_zero(name_fmt)) {
00816       /* Almost every channel is calling this function, and setting the name via the ast_string_field_build() call.
00817        * And they all use slightly different formats for their name string.
00818        * This means, to set the name here, we have to accept variable args, and call the string_field_build from here.
00819        * This means, that the stringfields must have a routine that takes the va_lists directly, and 
00820        * uses them to build the string, instead of forming the va_lists internally from the vararg ... list.
00821        * This new function was written so this can be accomplished.
00822        */
00823       va_start(ap1, name_fmt);
00824       va_start(ap2, name_fmt);
00825       ast_string_field_build_va(tmp, name, name_fmt, ap1, ap2);
00826       va_end(ap1);
00827       va_end(ap2);
00828    }
00829 
00830    /* Reminder for the future: under what conditions do we NOT want to track cdrs on channels? */
00831 
00832    /* These 4 variables need to be set up for the cdr_init() to work right */
00833    if (amaflag)
00834       tmp->amaflags = amaflag;
00835    else
00836       tmp->amaflags = ast_default_amaflags;
00837    
00838    if (!ast_strlen_zero(acctcode))
00839       ast_string_field_set(tmp, accountcode, acctcode);
00840    else
00841       ast_string_field_set(tmp, accountcode, ast_default_accountcode);
00842       
00843    if (!ast_strlen_zero(context))
00844       ast_copy_string(tmp->context, context, sizeof(tmp->context));
00845    else
00846       strcpy(tmp->context, "default");
00847 
00848    if (!ast_strlen_zero(exten))
00849       ast_copy_string(tmp->exten, exten, sizeof(tmp->exten));
00850    else
00851       strcpy(tmp->exten, "s");
00852 
00853    tmp->priority = 1;
00854       
00855    tmp->cdr = ast_cdr_alloc();
00856    ast_cdr_init(tmp->cdr, tmp);
00857    ast_cdr_start(tmp->cdr);
00858    
00859    headp = &tmp->varshead;
00860    AST_LIST_HEAD_INIT_NOLOCK(headp);
00861    
00862    ast_mutex_init(&tmp->lock);
00863    
00864    AST_LIST_HEAD_INIT_NOLOCK(&tmp->datastores);
00865    
00866    ast_string_field_set(tmp, language, defaultlanguage);
00867 
00868    tmp->tech = &null_tech;
00869 
00870    AST_LIST_LOCK(&channels);
00871    AST_LIST_INSERT_HEAD(&channels, tmp, chan_list);
00872    AST_LIST_UNLOCK(&channels);
00873 
00874    /*\!note
00875     * and now, since the channel structure is built, and has its name, let's
00876     * call the manager event generator with this Newchannel event. This is the
00877     * proper and correct place to make this call, but you sure do have to pass
00878     * a lot of data into this func to do it here!
00879     */
00880    if (!ast_strlen_zero(name_fmt)) {
00881       manager_event(EVENT_FLAG_CALL, "Newchannel",
00882             "Channel: %s\r\n"
00883             "State: %s\r\n"
00884             "CallerIDNum: %s\r\n"
00885             "CallerIDName: %s\r\n"
00886             "Uniqueid: %s\r\n",
00887             tmp->name, ast_state2str(state),
00888             S_OR(cid_num, "<unknown>"),
00889             S_OR(cid_name, "<unknown>"),
00890             tmp->uniqueid);
00891    }
00892 
00893    return tmp;
00894 }

enum ast_bridge_result ast_channel_bridge ( struct ast_channel c0,
struct ast_channel c1,
struct ast_bridge_config config,
struct ast_frame **  fo,
struct ast_channel **  rc 
)

Bridge two channels together.

Bridge two channels together

Parameters:
c0 first channel to bridge
c1 second channel to bridge
config config for the channels
fo destination frame(?)
rc destination channel(?) Bridge two channels (c0 and c1) together. If an important frame occurs, we return that frame in rf (remember, it could be NULL) and which channel (0 or 1) in rc

Definition at line 4042 of file channel.c.

References ast_channel::_bridge, ast_channel::_softhangup, AST_BRIDGE_COMPLETE, AST_BRIDGE_FAILED, AST_BRIDGE_FAILED_NOWARN, AST_BRIDGE_RETRY, ast_channel_make_compatible(), ast_check_hangup(), ast_check_hangup_locked(), ast_clear_flag, AST_CONTROL_SRCUPDATE, AST_FEATURE_PLAY_WARNING, AST_FEATURE_REDIRECT, AST_FLAG_END_DTMF_ONLY, AST_FLAG_NBRIDGE, AST_FLAG_ZOMBIE, ast_generic_bridge(), ast_indicate(), ast_log(), ast_samp2tv(), ast_set_flag, AST_SOFTHANGUP_UNBRIDGE, ast_strlen_zero(), ast_test_flag, ast_tvadd(), ast_tvdiff_ms(), ast_tvnow(), ast_tvsub(), ast_tvzero(), ast_verbose(), ast_channel::audiohooks, ast_channel_tech::bridge, bridge_playfile(), ast_channel::cid, ast_callerid::cid_num, config, ast_channel::generator, LOG_DEBUG, manager_event(), ast_channel::masq, ast_channel::masqr, ast_channel::monitor, ast_channel::name, ast_channel::nativeformats, option_debug, option_verbose, pbx_builtin_getvar_helper(), pbx_builtin_setvar_helper(), ast_channel::readformat, ast_channel_tech::send_digit_begin, t, ast_channel::tech, ast_channel::uniqueid, VERBOSE_PREFIX_3, and ast_channel::writeformat.

Referenced by ast_bridge_call().

04044 {
04045    struct ast_channel *who = NULL;
04046    enum ast_bridge_result res = AST_BRIDGE_COMPLETE;
04047    int nativefailed=0;
04048    int firstpass;
04049    int o0nativeformats;
04050    int o1nativeformats;
04051    long time_left_ms=0;
04052    struct timeval nexteventts = { 0, };
04053    char caller_warning = 0;
04054    char callee_warning = 0;
04055 
04056    if (c0->_bridge) {
04057       ast_log(LOG_WARNING, "%s is already in a bridge with %s\n",
04058          c0->name, c0->_bridge->name);
04059       return -1;
04060    }
04061    if (c1->_bridge) {
04062       ast_log(LOG_WARNING, "%s is already in a bridge with %s\n",
04063          c1->name, c1->_bridge->name);
04064       return -1;
04065    }
04066    
04067    /* Stop if we're a zombie or need a soft hangup */
04068    if (ast_test_flag(c0, AST_FLAG_ZOMBIE) || ast_check_hangup_locked(c0) ||
04069        ast_test_flag(c1, AST_FLAG_ZOMBIE) || ast_check_hangup_locked(c1))
04070       return -1;
04071 
04072    *fo = NULL;
04073    firstpass = config->firstpass;
04074    config->firstpass = 0;
04075 
04076    if (ast_tvzero(config->start_time))
04077       config->start_time = ast_tvnow();
04078    time_left_ms = config->timelimit;
04079 
04080    caller_warning = ast_test_flag(&config->features_caller, AST_FEATURE_PLAY_WARNING);
04081    callee_warning = ast_test_flag(&config->features_callee, AST_FEATURE_PLAY_WARNING);
04082 
04083    if (config->start_sound && firstpass) {
04084       if (caller_warning)
04085          bridge_playfile(c0, c1, config->start_sound, time_left_ms / 1000);
04086       if (callee_warning)
04087          bridge_playfile(c1, c0, config->start_sound, time_left_ms / 1000);
04088    }
04089 
04090    /* Keep track of bridge */
04091    c0->_bridge = c1;
04092    c1->_bridge = c0;
04093 
04094    /* \todo  XXX here should check that cid_num is not NULL */
04095    manager_event(EVENT_FLAG_CALL, "Link",
04096             "Channel1: %s\r\n"
04097             "Channel2: %s\r\n"
04098             "Uniqueid1: %s\r\n"
04099             "Uniqueid2: %s\r\n"
04100             "CallerID1: %s\r\n"
04101             "CallerID2: %s\r\n",
04102             c0->name, c1->name, c0->uniqueid, c1->uniqueid, c0->cid.cid_num, c1->cid.cid_num);
04103 
04104    o0nativeformats = c0->nativeformats;
04105    o1nativeformats = c1->nativeformats;
04106 
04107    if (config->feature_timer) {
04108       nexteventts = ast_tvadd(config->start_time, ast_samp2tv(config->feature_timer, 1000));
04109    } else if (config->timelimit) {
04110       nexteventts = ast_tvadd(config->start_time, ast_samp2tv(config->timelimit, 1000));
04111       if (caller_warning || callee_warning)
04112          nexteventts = ast_tvsub(nexteventts, ast_samp2tv(config->play_warning, 1000));
04113    }
04114 
04115    if (!c0->tech->send_digit_begin)
04116       ast_set_flag(c1, AST_FLAG_END_DTMF_ONLY);
04117    if (!c1->tech->send_digit_begin)
04118       ast_set_flag(c0, AST_FLAG_END_DTMF_ONLY);
04119 
04120    /* Before we enter in and bridge these two together tell them both the source of audio has changed */
04121    ast_indicate(c0, AST_CONTROL_SRCUPDATE);
04122    ast_indicate(c1, AST_CONTROL_SRCUPDATE);
04123 
04124    for (/* ever */;;) {
04125       struct timeval now = { 0, };
04126       int to;
04127 
04128       to = -1;
04129 
04130       if (!ast_tvzero(nexteventts)) {
04131          now = ast_tvnow();
04132          to = ast_tvdiff_ms(nexteventts, now);
04133          if (to <= 0) {
04134             if (!config->timelimit) {
04135                res = AST_BRIDGE_COMPLETE;
04136                break;
04137             }
04138             to = 0;
04139          }
04140       }
04141 
04142       if (config->timelimit) {
04143          time_left_ms = config->timelimit - ast_tvdiff_ms(now, config->start_time);
04144          if (time_left_ms < to)
04145             to = time_left_ms;
04146 
04147          if (time_left_ms <= 0) {
04148             if (caller_warning && config->end_sound)
04149                bridge_playfile(c0, c1, config->end_sound, 0);
04150             if (callee_warning && config->end_sound)
04151                bridge_playfile(c1, c0, config->end_sound, 0);
04152             *fo = NULL;
04153             if (who)
04154                *rc = who;
04155             res = 0;
04156             break;
04157          }
04158          
04159          if (!to) {
04160             if (time_left_ms >= 5000 && config->warning_sound && config->play_warning) {
04161                int t = (time_left_ms + 500) / 1000; /* round to nearest second */
04162                if (caller_warning)
04163                   bridge_playfile(c0, c1, config->warning_sound, t);
04164                if (callee_warning)
04165                   bridge_playfile(c1, c0, config->warning_sound, t);
04166             }
04167             if (config->warning_freq && (time_left_ms > (config->warning_freq + 5000)))
04168                nexteventts = ast_tvadd(nexteventts, ast_samp2tv(config->warning_freq, 1000));
04169             else
04170                nexteventts = ast_tvadd(config->start_time, ast_samp2tv(config->timelimit, 1000));
04171          }
04172       }
04173 
04174       if (c0->_softhangup == AST_SOFTHANGUP_UNBRIDGE || c1->_softhangup == AST_SOFTHANGUP_UNBRIDGE) {
04175          if (c0->_softhangup == AST_SOFTHANGUP_UNBRIDGE)
04176             c0->_softhangup = 0;
04177          if (c1->_softhangup == AST_SOFTHANGUP_UNBRIDGE)
04178             c1->_softhangup = 0;
04179          c0->_bridge = c1;
04180          c1->_bridge = c0;
04181          if (option_debug)
04182             ast_log(LOG_DEBUG, "Unbridge signal received. Ending native bridge.\n");
04183          continue;
04184       }
04185       
04186       /* Stop if we're a zombie or need a soft hangup */
04187       if (ast_test_flag(c0, AST_FLAG_ZOMBIE) || ast_check_hangup_locked(c0) ||
04188           ast_test_flag(c1, AST_FLAG_ZOMBIE) || ast_check_hangup_locked(c1)) {
04189          *fo = NULL;
04190          if (who)
04191             *rc = who;
04192          res = 0;
04193          if (option_debug)
04194             ast_log(LOG_DEBUG, "Bridge stops because we're zombie or need a soft hangup: c0=%s, c1=%s, flags: %s,%s,%s,%s\n",
04195                c0->name, c1->name,
04196                ast_test_flag(c0, AST_FLAG_ZOMBIE) ? "Yes" : "No",
04197                ast_check_hangup(c0) ? "Yes" : "No",
04198                ast_test_flag(c1, AST_FLAG_ZOMBIE) ? "Yes" : "No",
04199                ast_check_hangup(c1) ? "Yes" : "No");
04200          break;
04201       }
04202       
04203       /* See if the BRIDGEPEER variable needs to be updated */
04204       if (!ast_strlen_zero(pbx_builtin_getvar_helper(c0, "BRIDGEPEER")))
04205          pbx_builtin_setvar_helper(c0, "BRIDGEPEER", c1->name);
04206       if (!ast_strlen_zero(pbx_builtin_getvar_helper(c1, "BRIDGEPEER")))
04207          pbx_builtin_setvar_helper(c1, "BRIDGEPEER", c0->name);
04208       
04209       if (c0->tech->bridge &&
04210           (config->timelimit == 0) &&
04211           (c0->tech->bridge == c1->tech->bridge) &&
04212           !nativefailed && !c0->monitor && !c1->monitor &&
04213           !c0->audiohooks && !c1->audiohooks && !ast_test_flag(&(config->features_callee),AST_FEATURE_REDIRECT) &&
04214           !ast_test_flag(&(config->features_caller),AST_FEATURE_REDIRECT) &&
04215           !c0->masq && !c0->masqr && !c1->masq && !c1->masqr) {
04216          /* Looks like they share a bridge method and nothing else is in the way */
04217          ast_set_flag(c0, AST_FLAG_NBRIDGE);
04218          ast_set_flag(c1, AST_FLAG_NBRIDGE);
04219          if ((res = c0->tech->bridge(c0, c1, config->flags, fo, rc, to)) == AST_BRIDGE_COMPLETE) {
04220             /* \todo  XXX here should check that cid_num is not NULL */
04221             manager_event(EVENT_FLAG_CALL, "Unlink",
04222                      "Channel1: %s\r\n"
04223                      "Channel2: %s\r\n"
04224                      "Uniqueid1: %s\r\n"
04225                      "Uniqueid2: %s\r\n"
04226                      "CallerID1: %s\r\n"
04227                      "CallerID2: %s\r\n",
04228                      c0->name, c1->name, c0->uniqueid, c1->uniqueid, c0->cid.cid_num, c1->cid.cid_num);
04229             if (option_debug)
04230                ast_log(LOG_DEBUG, "Returning from native bridge, channels: %s, %s\n", c0->name, c1->name);
04231 
04232             ast_clear_flag(c0, AST_FLAG_NBRIDGE);
04233             ast_clear_flag(c1, AST_FLAG_NBRIDGE);
04234 
04235             if (c0->_softhangup == AST_SOFTHANGUP_UNBRIDGE || c1->_softhangup == AST_SOFTHANGUP_UNBRIDGE)
04236                continue;
04237 
04238             c0->_bridge = NULL;
04239             c1->_bridge = NULL;
04240 
04241             return res;
04242          } else {
04243             ast_clear_flag(c0, AST_FLAG_NBRIDGE);
04244             ast_clear_flag(c1, AST_FLAG_NBRIDGE);
04245          }
04246          switch (res) {
04247          case AST_BRIDGE_RETRY:
04248             continue;
04249          default:
04250             if (option_verbose > 2)
04251                ast_verbose(VERBOSE_PREFIX_3 "Native bridging %s and %s ended\n",
04252                       c0->name, c1->name);
04253             /* fallthrough */
04254          case AST_BRIDGE_FAILED_NOWARN:
04255             nativefailed++;
04256             break;
04257          }
04258       }
04259    
04260       if (((c0->writeformat != c1->readformat) || (c0->readformat != c1->writeformat) ||
04261           (c0->nativeformats != o0nativeformats) || (c1->nativeformats != o1nativeformats)) &&
04262           !(c0->generator || c1->generator)) {
04263          if (ast_channel_make_compatible(c0, c1)) {
04264             ast_log(LOG_WARNING, "Can't make %s and %s compatible\n", c0->name, c1->name);
04265             /* \todo  XXX here should check that cid_num is not NULL */
04266                                 manager_event(EVENT_FLAG_CALL, "Unlink",
04267                      "Channel1: %s\r\n"
04268                      "Channel2: %s\r\n"
04269                      "Uniqueid1: %s\r\n"
04270                      "Uniqueid2: %s\r\n"
04271                      "CallerID1: %s\r\n"
04272                      "CallerID2: %s\r\n",
04273                      c0->name, c1->name, c0->uniqueid, c1->uniqueid, c0->cid.cid_num, c1->cid.cid_num);
04274             return AST_BRIDGE_FAILED;
04275          }
04276          o0nativeformats = c0->nativeformats;
04277          o1nativeformats = c1->nativeformats;
04278       }
04279 
04280       if (!ast_strlen_zero(pbx_builtin_getvar_helper(c0, "BRIDGEPEER")))
04281          pbx_builtin_setvar_helper(c0, "BRIDGEPEER", c1->name);
04282       if (!ast_strlen_zero(pbx_builtin_getvar_helper(c1, "BRIDGEPEER")))
04283          pbx_builtin_setvar_helper(c1, "BRIDGEPEER", c0->name);
04284 
04285       res = ast_generic_bridge(c0, c1, config, fo, rc, nexteventts);
04286       if (res != AST_BRIDGE_RETRY)
04287          break;
04288    }
04289 
04290    ast_clear_flag(c0, AST_FLAG_END_DTMF_ONLY);
04291    ast_clear_flag(c1, AST_FLAG_END_DTMF_ONLY);
04292 
04293    /* Now that we have broken the bridge the source will change yet again */
04294    ast_indicate(c0, AST_CONTROL_SRCUPDATE);
04295    ast_indicate(c1, AST_CONTROL_SRCUPDATE);
04296 
04297    c0->_bridge = NULL;
04298    c1->_bridge = NULL;
04299 
04300    /* \todo  XXX here should check that cid_num is not NULL */
04301    manager_event(EVENT_FLAG_CALL, "Unlink",
04302             "Channel1: %s\r\n"
04303             "Channel2: %s\r\n"
04304             "Uniqueid1: %s\r\n"
04305             "Uniqueid2: %s\r\n"
04306             "CallerID1: %s\r\n"
04307             "CallerID2: %s\r\n",
04308             c0->name, c1->name, c0->uniqueid, c1->uniqueid, c0->cid.cid_num, c1->cid.cid_num);
04309    if (option_debug)
04310       ast_log(LOG_DEBUG, "Bridge stops bridging channels %s and %s\n", c0->name, c1->name);
04311 
04312    return res;
04313 }

int ast_channel_cmpwhentohangup ( struct ast_channel chan,
time_t  offset 
)

Compare a offset with the settings of when to hang a channel up.

Parameters:
chan channel on which to check for hang up
offset offset in seconds from current time
Returns:
1, 0, or -1 This function compares a offset from current time with the absolute time out on a channel (when to hang up). If the absolute time out on a channel is earlier than current time plus the offset, it returns 1, if the two time values are equal, it return 0, otherwise, it retturn -1.

Definition at line 475 of file channel.c.

References ast_channel::whentohangup.

00476 {
00477    time_t whentohangup;
00478 
00479    if (chan->whentohangup == 0) {
00480       return (offset == 0) ? 0 : -1;
00481    } else {
00482       if (offset == 0)  /* XXX why is this special ? */
00483          return (1);
00484       else {
00485          whentohangup = offset + time (NULL);
00486          if (chan->whentohangup < whentohangup)
00487             return (1);
00488          else if (chan->whentohangup == whentohangup)
00489             return (0);
00490          else
00491             return (-1);
00492       }
00493    }
00494 }

int ast_channel_datastore_add ( struct ast_channel chan,
struct ast_datastore datastore 
)

Add a datastore to a channel.

Definition at line 1370 of file channel.c.

References AST_LIST_INSERT_HEAD, ast_channel::datastores, and ast_datastore::entry.

Referenced by _macro_exec(), setup_chanspy_ds(), setup_inheritance_datastore(), setup_transfer_datastore(), smdi_msg_retrieve_read(), speech_create(), and try_calling().

01371 {
01372    int res = 0;
01373 
01374    AST_LIST_INSERT_HEAD(&chan->datastores, datastore, entry);
01375 
01376    return res;
01377 }

struct ast_datastore* ast_channel_datastore_alloc ( const struct ast_datastore_info info,
char *  uid 
)

Create a channel datastore structure.

Definition at line 1309 of file channel.c.

References ast_calloc, ast_strdup, and ast_datastore::info.

Referenced by _macro_exec(), ast_channel_datastore_inherit(), setup_chanspy_ds(), setup_inheritance_datastore(), setup_transfer_datastore(), smdi_msg_retrieve_read(), speech_create(), and try_calling().

01310 {
01311    struct ast_datastore *datastore = NULL;
01312 
01313    /* Make sure we at least have type so we can identify this */
01314    if (info == NULL) {
01315       return NULL;
01316    }
01317 
01318    /* Allocate memory for datastore and clear it */
01319    datastore = ast_calloc(1, sizeof(*datastore));
01320    if (datastore == NULL) {
01321       return NULL;
01322    }
01323 
01324    datastore->info = info;
01325 
01326    datastore->uid = ast_strdup(uid);
01327 
01328    return datastore;
01329 }

struct ast_datastore* ast_channel_datastore_find ( struct ast_channel chan,
const struct ast_datastore_info info,
char *  uid 
)

Find a datastore on a channel.

Definition at line 1397 of file channel.c.

References AST_LIST_TRAVERSE_SAFE_BEGIN, AST_LIST_TRAVERSE_SAFE_END, ast_channel::datastores, ast_datastore::entry, ast_datastore::info, and ast_datastore::uid.

Referenced by _macro_exec(), attended_transfer_occurred(), chanspy_ds_free(), do_atxfer(), do_parking_thread(), find_speech(), func_inheritance_write(), queue_transfer_fixup(), smdi_msg_read(), speech_background(), speech_destroy(), and try_calling().

01398 {
01399    struct ast_datastore *datastore = NULL;
01400    
01401    if (info == NULL)
01402       return NULL;
01403 
01404    AST_LIST_TRAVERSE_SAFE_BEGIN(&chan->datastores, datastore, entry) {
01405       if (datastore->info == info) {
01406          if (uid != NULL && datastore->uid != NULL) {
01407             if (!strcasecmp(uid, datastore->uid)) {
01408                /* Matched by type AND uid */
01409                break;
01410             }
01411          } else {
01412             /* Matched by type at least */
01413             break;
01414          }
01415       }
01416    }
01417    AST_LIST_TRAVERSE_SAFE_END
01418 
01419    return datastore;
01420 }

int ast_channel_datastore_free ( struct ast_datastore datastore  ) 

Free a channel datastore structure.

Definition at line 1331 of file channel.c.

References ast_datastore::data, ast_datastore_info::destroy, free, ast_datastore::info, and ast_datastore::uid.

Referenced by ast_channel_free(), chanspy_ds_free(), setup_inheritance_datastore(), and try_calling().

01332 {
01333    int res = 0;
01334 
01335    /* Using the destroy function (if present) destroy the data */
01336    if (datastore->info->destroy != NULL && datastore->data != NULL) {
01337       datastore->info->destroy(datastore->data);
01338       datastore->data = NULL;
01339    }
01340 
01341    /* Free allocated UID memory */
01342    if (datastore->uid != NULL) {
01343       free(datastore->uid);
01344       datastore->uid = NULL;
01345    }
01346 
01347    /* Finally free memory used by ourselves */
01348    free(datastore);
01349 
01350    return res;
01351 }

int ast_channel_datastore_inherit ( struct ast_channel from,
struct ast_channel to 
)

Inherit datastores from a parent to a child.

Definition at line 1353 of file channel.c.

References ast_channel_datastore_alloc(), AST_LIST_INSERT_TAIL, AST_LIST_TRAVERSE, ast_datastore::data, DATASTORE_INHERIT_FOREVER, ast_channel::datastores, ast_datastore_info::duplicate, ast_datastore::entry, ast_datastore::info, ast_datastore::inheritance, and ast_datastore::uid.

Referenced by local_call(), and wait_for_answer().

01354 {
01355    struct ast_datastore *datastore = NULL, *datastore2;
01356 
01357    AST_LIST_TRAVERSE(&from->datastores, datastore, entry) {
01358       if (datastore->inheritance > 0) {
01359          datastore2 = ast_channel_datastore_alloc(datastore->info, datastore->uid);
01360          if (datastore2) {
01361             datastore2->data = datastore->info->duplicate ? datastore->info->duplicate(datastore->data) : NULL;
01362             datastore2->inheritance = datastore->inheritance == DATASTORE_INHERIT_FOREVER ? DATASTORE_INHERIT_FOREVER : datastore->inheritance - 1;
01363             AST_LIST_INSERT_TAIL(&to->datastores, datastore2, entry);
01364          }
01365       }
01366    }
01367    return 0;
01368 }

int ast_channel_datastore_remove ( struct ast_channel chan,
struct ast_datastore datastore 
)

Remove a datastore from a channel.

Definition at line 1379 of file channel.c.

References AST_LIST_REMOVE_CURRENT, AST_LIST_TRAVERSE_SAFE_BEGIN, AST_LIST_TRAVERSE_SAFE_END, ast_channel::datastores, and ast_datastore::entry.

Referenced by chanspy_ds_free(), queue_transfer_fixup(), speech_background(), speech_destroy(), and try_calling().

01380 {
01381    struct ast_datastore *datastore2 = NULL;
01382    int res = -1;
01383 
01384    /* Find our position and remove ourselves */
01385    AST_LIST_TRAVERSE_SAFE_BEGIN(&chan->datastores, datastore2, entry) {
01386       if (datastore2 == datastore) {
01387          AST_LIST_REMOVE_CURRENT(&chan->datastores, entry);
01388          res = 0;
01389          break;
01390       }
01391    }
01392    AST_LIST_TRAVERSE_SAFE_END
01393 
01394    return res;
01395 }

int ast_channel_defer_dtmf ( struct ast_channel chan  ) 

Set defer DTMF flag on channel.

Defer DTMF so that you only read things like hangups and audio. Returns non-zero if channel was already DTMF-deferred or 0 if channel is just now being DTMF-deferred

Definition at line 1007 of file channel.c.

References AST_FLAG_DEFER_DTMF, ast_set_flag, and ast_test_flag.

Referenced by __adsi_transmit_messages(), and find_cache().

01008 {
01009    int pre = 0;
01010 
01011    if (chan) {
01012       pre = ast_test_flag(chan, AST_FLAG_DEFER_DTMF);
01013       ast_set_flag(chan, AST_FLAG_DEFER_DTMF);
01014    }
01015    return pre;
01016 }

void ast_channel_free ( struct ast_channel chan  ) 

Free a channel structure.

Definition at line 1214 of file channel.c.

References ast_channel::alertpipe, ast_app_group_discard(), ast_cdr_discard(), ast_channel_datastore_free(), ast_channel_lock, AST_CHANNEL_NAME, ast_channel_unlock, ast_copy_string(), ast_device_state_changed_literal(), ast_frfree, ast_jb_destroy(), AST_LIST_LOCK, AST_LIST_REMOVE, AST_LIST_REMOVE_HEAD, AST_LIST_UNLOCK, ast_log(), ast_moh_cleanup(), ast_mutex_destroy(), ast_string_field_free_memory, ast_translator_free_path(), ast_var_delete(), ast_channel::cdr, ast_channel::cid, ast_channel::datastores, ast_datastore::entry, f, free, free_cid(), ast_channel::lock, LOG_ERROR, ast_channel::monitor, ast_channel::music_state, name, ast_channel::name, ast_channel::pbx, ast_channel::readq, ast_channel::readtrans, ast_channel::sched, sched_context_destroy(), ast_channel_monitor::stop, ast_channel::tech_pvt, ast_channel::timingfd, ast_channel::varshead, and ast_channel::writetrans.

Referenced by acf_odbc_read(), acf_odbc_write(), action_getvar(), agent_cleanup(), agent_new(), ast_do_masquerade(), ast_hangup(), ast_iax2_new(), ast_pbx_outgoing_cdr_failed(), gtalk_newcall(), local_new(), make_email_file(), pbx_substitute_variables_helper_full(), and sendpage().

01215 {
01216    int fd;
01217    struct ast_var_t *vardata;
01218    struct ast_frame *f;
01219    struct varshead *headp;
01220    struct ast_datastore *datastore = NULL;
01221    char name[AST_CHANNEL_NAME], *dashptr;
01222    
01223    headp=&chan->varshead;
01224    
01225    AST_LIST_LOCK(&channels);
01226    if (!AST_LIST_REMOVE(&channels, chan, chan_list)) {
01227       AST_LIST_UNLOCK(&channels);
01228       ast_log(LOG_ERROR, "Unable to find channel in list to free. Assuming it has already been done.\n");
01229    }
01230    /* Lock and unlock the channel just to be sure nobody has it locked still
01231       due to a reference retrieved from the channel list. */
01232    ast_channel_lock(chan);
01233    ast_channel_unlock(chan);
01234 
01235    /* Get rid of each of the data stores on the channel */
01236    while ((datastore = AST_LIST_REMOVE_HEAD(&chan->datastores, entry)))
01237       /* Free the data store */
01238       ast_channel_datastore_free(datastore);
01239 
01240    /* Lock and unlock the channel just to be sure nobody has it locked still
01241       due to a reference that was stored in a datastore. (i.e. app_chanspy) */
01242    ast_channel_lock(chan);
01243    ast_channel_unlock(chan);
01244 
01245    if (chan->tech_pvt) {
01246       ast_log(LOG_WARNING, "Channel '%s' may not have been hung up properly\n", chan->name);
01247       free(chan->tech_pvt);
01248    }
01249 
01250    if (chan->sched)
01251       sched_context_destroy(chan->sched);
01252 
01253    ast_copy_string(name, chan->name, sizeof(name));
01254    if ((dashptr = strrchr(name, '-'))) {
01255       *dashptr = '\0';
01256    }
01257 
01258    /* Stop monitoring */
01259    if (chan->monitor)
01260       chan->monitor->stop( chan, 0 );
01261 
01262    /* If there is native format music-on-hold state, free it */
01263    if (chan->music_state)
01264       ast_moh_cleanup(chan);
01265 
01266    /* Free translators */
01267    if (chan->readtrans)
01268       ast_translator_free_path(chan->readtrans);
01269    if (chan->writetrans)
01270       ast_translator_free_path(chan->writetrans);
01271    if (chan->pbx)
01272       ast_log(LOG_WARNING, "PBX may not have been terminated properly on '%s'\n", chan->name);
01273    free_cid(&chan->cid);
01274    /* Close pipes if appropriate */
01275    if ((fd = chan->alertpipe[0]) > -1)
01276       close(fd);
01277    if ((fd = chan->alertpipe[1]) > -1)
01278       close(fd);
01279    if ((fd = chan->timingfd) > -1)
01280       close(fd);
01281    while ((f = AST_LIST_REMOVE_HEAD(&chan->readq, frame_list)))
01282       ast_frfree(f);
01283    
01284    /* loop over the variables list, freeing all data and deleting list items */
01285    /* no need to lock the list, as the channel is already locked */
01286    
01287    while ((vardata = AST_LIST_REMOVE_HEAD(headp, entries)))
01288       ast_var_delete(vardata);
01289 
01290    ast_app_group_discard(chan);
01291 
01292    /* Destroy the jitterbuffer */
01293    ast_jb_destroy(chan);
01294 
01295    if (chan->cdr) {
01296       ast_cdr_discard(chan->cdr);
01297       chan->cdr = NULL;
01298    }
01299    
01300    ast_mutex_destroy(&chan->lock);
01301 
01302    ast_string_field_free_memory(chan);
01303    free(chan);
01304    AST_LIST_UNLOCK(&channels);
01305 
01306    ast_device_state_changed_literal(name);
01307 }

void ast_channel_inherit_variables ( const struct ast_channel parent,
struct ast_channel child 
)

Inherits channel variable from parent to child channel.

Parameters:
parent Parent channel
child Child channel
Scans all channel variables in the parent channel, looking for those that should be copied into the child channel. Variables whose names begin with a single '_' are copied into the child channel with the prefix removed. Variables whose names begin with '__' are copied into the child channel with their names unchanged.

Definition at line 3431 of file channel.c.

References AST_LIST_INSERT_TAIL, AST_LIST_TRAVERSE, ast_log(), ast_var_assign(), ast_var_full_name(), ast_var_name(), ast_var_value(), ast_var_t::entries, LOG_DEBUG, option_debug, and ast_channel::varshead.

Referenced by __ast_request_and_dial(), agent_call(), ast_feature_request_and_dial(), begin_dial(), findmeexec(), ring_entry(), and wait_for_answer().

03432 {
03433    struct ast_var_t *current, *newvar;
03434    const char *varname;
03435 
03436    AST_LIST_TRAVERSE(&parent->varshead, current, entries) {
03437       int vartype = 0;
03438 
03439       varname = ast_var_full_name(current);
03440       if (!varname)
03441          continue;
03442 
03443       if (varname[0] == '_') {
03444          vartype = 1;
03445          if (varname[1] == '_')
03446             vartype = 2;
03447       }
03448 
03449       switch (vartype) {
03450       case 1:
03451          newvar = ast_var_assign(&varname[1], ast_var_value(current));
03452          if (newvar) {
03453             AST_LIST_INSERT_TAIL(&child->varshead, newvar, entries);
03454             if (option_debug)
03455                ast_log(LOG_DEBUG, "Copying soft-transferable variable %s.\n", ast_var_name(newvar));
03456          }
03457          break;
03458       case 2:
03459          newvar = ast_var_assign(ast_var_full_name(current), ast_var_value(current));
03460          if (newvar) {
03461             AST_LIST_INSERT_TAIL(&child->varshead, newvar, entries);
03462             if (option_debug)
03463                ast_log(LOG_DEBUG, "Copying hard-transferable variable %s.\n", ast_var_name(newvar));
03464          }
03465          break;
03466       default:
03467          if (option_debug)
03468             ast_log(LOG_DEBUG, "Not copying variable %s.\n", ast_var_name(current));
03469          break;
03470       }
03471    }
03472 }

int ast_channel_make_compatible ( struct ast_channel c0,
struct ast_channel c1 
)

Makes two channel formats compatible.

Parameters:
c0 first channel to make compatible
c1 other channel to make compatible Set two channels to compatible formats -- call before ast_channel_bridge in general .
Returns:
Returns 0 on success and -1 if it could not be done

Definition at line 3284 of file channel.c.

References AST_FORMAT_SLINEAR, ast_log(), ast_opt_transcode_via_slin, ast_set_read_format(), ast_set_write_format(), ast_translate_path_steps(), ast_translator_best_choice(), ast_channel::name, ast_channel::nativeformats, ast_channel::readformat, and ast_channel::writeformat.

Referenced by app_exec(), ast_channel_bridge(), check_compat(), park_exec(), try_calling(), and wait_for_answer().

03285 {
03286    int src;
03287    int dst;
03288 
03289    if (chan->readformat == peer->writeformat && chan->writeformat == peer->readformat) {
03290       /* Already compatible!  Moving on ... */
03291       return 0;
03292    }
03293 
03294    /* Set up translation from the chan to the peer */
03295    src = chan->nativeformats;
03296    dst = peer->nativeformats;
03297    if (ast_translator_best_choice(&dst, &src) < 0) {
03298       ast_log(LOG_WARNING, "No path to translate from %s(%d) to %s(%d)\n", chan->name, src, peer->name, dst);
03299       return -1;
03300    }
03301 
03302    /* if the best path is not 'pass through', then
03303       transcoding is needed; if desired, force transcode path
03304       to use SLINEAR between channels, but only if there is
03305       no direct conversion available */
03306    if ((src != dst) && ast_opt_transcode_via_slin &&
03307        (ast_translate_path_steps(dst, src) != 1))
03308       dst = AST_FORMAT_SLINEAR;
03309    if (ast_set_read_format(chan, dst) < 0) {
03310       ast_log(LOG_WARNING, "Unable to set read format on channel %s to %d\n", chan->name, dst);
03311       return -1;
03312    }
03313    if (ast_set_write_format(peer, dst) < 0) {
03314       ast_log(LOG_WARNING, "Unable to set write format on channel %s to %d\n", peer->name, dst);
03315       return -1;
03316    }
03317 
03318    /* Set up translation from the peer to the chan */
03319    src = peer->nativeformats;
03320    dst = chan->nativeformats;
03321    if (ast_translator_best_choice(&dst, &src) < 0) {
03322       ast_log(LOG_WARNING, "No path to translate from %s(%d) to %s(%d)\n", peer->name, src, chan->name, dst);
03323       return -1;
03324    }
03325 
03326    /* if the best path is not 'pass through', then
03327       transcoding is needed; if desired, force transcode path
03328       to use SLINEAR between channels, but only if there is
03329       no direct conversion available */
03330    if ((src != dst) && ast_opt_transcode_via_slin &&
03331        (ast_translate_path_steps(dst, src) != 1))
03332       dst = AST_FORMAT_SLINEAR;
03333    if (ast_set_read_format(peer, dst) < 0) {
03334       ast_log(LOG_WARNING, "Unable to set read format on channel %s to %d\n", peer->name, dst);
03335       return -1;
03336    }
03337    if (ast_set_write_format(chan, dst) < 0) {
03338       ast_log(LOG_WARNING, "Unable to set write format on channel %s to %d\n", chan->name, dst);
03339       return -1;
03340    }
03341    return 0;
03342 }

int ast_channel_masquerade ( struct ast_channel original,
struct ast_channel clone 
)

Weird function made for call transfers.

Parameters:
original channel to make a copy of
clone copy of the original channel This is a very strange and freaky function used primarily for transfer. Suppose that "original" and "clone" are two channels in random situations. This function takes the guts out of "clone" and puts them into the "original" channel, then alerts the channel driver of the change, asking it to fixup any private information (like the p->owner pointer) that is affected by the change. The physical layer of the original channel is hung up.

Definition at line 3344 of file channel.c.

References ast_channel::_bridge, ast_bridged_channel(), ast_channel_lock, ast_channel_trylock, ast_channel_unlock, ast_log(), ast_null_frame, ast_queue_frame(), ast_channel_tech::get_base_channel, LOG_DEBUG, ast_channel::masq, ast_channel::masqr, ast_channel::name, option_debug, and ast_channel::tech.

Referenced by ast_async_goto(), ast_pickup_call(), attempt_transfer(), check_availability(), check_bridge(), check_goto_on_transfer(), do_atxfer(), handle_invite_replaces(), iax_park(), masq_park_call(), misdn_transfer_bc(), pickup_do(), and sip_park().

03345 {
03346    int res = -1;
03347    struct ast_channel *final_orig, *final_clone, *base;
03348 
03349 retrymasq:
03350    final_orig = original;
03351    final_clone = clone;
03352 
03353    ast_channel_lock(original);
03354    while (ast_channel_trylock(clone)) {
03355       ast_channel_unlock(original);
03356       usleep(1);
03357       ast_channel_lock(original);
03358    }
03359 
03360    /* each of these channels may be sitting behind a channel proxy (i.e. chan_agent)
03361       and if so, we don't really want to masquerade it, but its proxy */
03362    if (original->_bridge && (original->_bridge != ast_bridged_channel(original)) && (original->_bridge->_bridge != original))
03363       final_orig = original->_bridge;
03364 
03365    if (clone->_bridge && (clone->_bridge != ast_bridged_channel(clone)) && (clone->_bridge->_bridge != clone))
03366       final_clone = clone->_bridge;
03367    
03368    if (final_clone->tech->get_base_channel && (base = final_clone->tech->get_base_channel(final_clone))) {
03369       final_clone = base;
03370    }
03371 
03372    if ((final_orig != original) || (final_clone != clone)) {
03373       /* Lots and lots of deadlock avoidance.  The main one we're competing with
03374        * is ast_write(), which locks channels recursively, when working with a
03375        * proxy channel. */
03376       if (ast_channel_trylock(final_orig)) {
03377          ast_channel_unlock(clone);
03378          ast_channel_unlock(original);
03379          goto retrymasq;
03380       }
03381       if (ast_channel_trylock(final_clone)) {
03382          ast_channel_unlock(final_orig);
03383          ast_channel_unlock(clone);
03384          ast_channel_unlock(original);
03385          goto retrymasq;
03386       }
03387       ast_channel_unlock(clone);
03388       ast_channel_unlock(original);
03389       original = final_orig;
03390       clone = final_clone;
03391    }
03392 
03393    if (original == clone) {
03394       ast_log(LOG_WARNING, "Can't masquerade channel '%s' into itself!\n", original->name);
03395       ast_channel_unlock(clone);
03396       ast_channel_unlock(original);
03397       return -1;
03398    }
03399 
03400    if (option_debug)
03401       ast_log(LOG_DEBUG, "Planning to masquerade channel %s into the structure of %s\n",
03402          clone->name, original->name);
03403    if (original->masq) {
03404       ast_log(LOG_WARNING, "%s is already going to masquerade as %s\n",
03405          original->masq->name, original->name);
03406    } else if (clone->masqr) {
03407       ast_log(LOG_WARNING, "%s is already going to masquerade as %s\n",
03408          clone->name, clone->masqr->name);
03409    } else {
03410       original->masq = clone;
03411       clone->masqr = original;
03412       ast_queue_frame(original, &ast_null_frame);
03413       ast_queue_frame(clone, &ast_null_frame);
03414       if (option_debug)
03415          ast_log(LOG_DEBUG, "Done planning to masquerade channel %s into the structure of %s\n", clone->name, original->name);
03416       res = 0;
03417    }
03418 
03419    ast_channel_unlock(clone);
03420    ast_channel_unlock(original);
03421 
03422    return res;
03423 }

char* ast_channel_reason2str ( int  reason  ) 

return an english explanation of the code returned thru __ast_request_and_dial's 'outstate' argument

Parameters:
reason The integer argument, usually taken from AST_CONTROL_ macros
Returns:
char pointer explaining the code

Definition at line 2977 of file channel.c.

References AST_CONTROL_ANSWER, AST_CONTROL_BUSY, AST_CONTROL_CONGESTION, AST_CONTROL_HANGUP, AST_CONTROL_RING, and AST_CONTROL_RINGING.

Referenced by attempt_thread().

02978 {
02979    switch (reason) /* the following appear to be the only ones actually returned by request_and_dial */
02980    {
02981    case 0:
02982       return "Call Failure (not BUSY, and not NO_ANSWER, maybe Circuit busy or down?)";
02983    case AST_CONTROL_HANGUP:
02984       return "Hangup";
02985    case AST_CONTROL_RING:
02986       return "Local Ring";
02987    case AST_CONTROL_RINGING:
02988       return "Remote end Ringing";
02989    case AST_CONTROL_ANSWER:
02990       return "Remote end has Answered";
02991    case AST_CONTROL_BUSY:
02992       return "Remote end is Busy";
02993    case AST_CONTROL_CONGESTION:
02994       return "Congestion (circuits busy)";
02995    default:
02996       return "Unknown Reason!!";
02997    }
02998 }

int ast_channel_register ( const struct ast_channel_tech tech  ) 

Register a channel technology (a new channel driver) Called by a channel module to register the kind of channels it supports.

Parameters:
tech Structure defining channel technology or "type"
Returns:
Returns 0 on success, -1 on failure.

Definition at line 497 of file channel.c.

References ast_calloc, AST_LIST_INSERT_HEAD, AST_LIST_LOCK, AST_LIST_TRAVERSE, AST_LIST_UNLOCK, ast_log(), ast_verbose(), chanlist::list, LOG_DEBUG, LOG_WARNING, option_debug, option_verbose, chanlist::tech, ast_channel_tech::type, and VERBOSE_PREFIX_2.

Referenced by load_module(), and unload_module().

00498 {
00499    struct chanlist *chan;
00500 
00501    AST_LIST_LOCK(&channels);
00502 
00503    AST_LIST_TRAVERSE(&backends, chan, list) {
00504       if (!strcasecmp(tech->type, chan->tech->type)) {
00505          ast_log(LOG_WARNING, "Already have a handler for type '%s'\n", tech->type);
00506          AST_LIST_UNLOCK(&channels);
00507          return -1;
00508       }
00509    }
00510    
00511    if (!(chan = ast_calloc(1, sizeof(*chan)))) {
00512       AST_LIST_UNLOCK(&channels);
00513       return -1;
00514    }
00515    chan->tech = tech;
00516    AST_LIST_INSERT_HEAD(&backends, chan, list);
00517 
00518    if (option_debug)
00519       ast_log(LOG_DEBUG, "Registered handler for '%s' (%s)\n", chan->tech->type, chan->tech->description);
00520 
00521    if (option_verbose > 1)
00522       ast_verbose(VERBOSE_PREFIX_2 "Registered channel type '%s' (%s)\n", chan->tech->type,
00523              chan->tech->description);
00524 
00525    AST_LIST_UNLOCK(&channels);
00526    return 0;
00527 }

int ast_channel_sendhtml ( struct ast_channel channel,
int  subclass,
const char *  data,
int  datalen 
)

Send HTML or URL on link. Returns 0 on success or -1 on failure

Definition at line 3272 of file channel.c.

References ast_channel_tech::send_html, and ast_channel::tech.

Referenced by agent_sendhtml(), ast_channel_sendurl(), and wait_for_answer().

03273 {
03274    if (chan->tech->send_html)
03275       return chan->tech->send_html(chan, subclass, data, datalen);
03276    return -1;
03277 }

int ast_channel_sendurl ( struct ast_channel channel,
const char *  url 
)

Send URL on link. Returns 0 on success or -1 on failure

Definition at line 3279 of file channel.c.

References ast_channel_sendhtml(), and AST_HTML_URL.

Referenced by sendurl_exec(), and try_calling().

03280 {
03281    return ast_channel_sendhtml(chan, AST_HTML_URL, url, strlen(url) + 1);
03282 }

int ast_channel_setoption ( struct ast_channel channel,
int  option,
void *  data,
int  datalen,
int  block 
)

Sets an option on a channel.

Parameters:
channel channel to set options on
option option to change
data data specific to option
datalen length of the data
block blocking or not Set an option on a channel (see frame.h), optionally blocking awaiting the reply Returns 0 on success and -1 on failure

Definition at line 4316 of file channel.c.

References ast_log(), errno, LOG_ERROR, ast_channel_tech::setoption, and ast_channel::tech.

Referenced by ast_bridge_call(), common_exec(), conf_run(), dahdi_hangup(), func_channel_write(), handle_tddmode(), play_record_review(), reset_volumes(), rpt(), set_listen_volume(), set_talk_volume(), try_calling(), and vm_forwardoptions().

04317 {
04318    int res;
04319 
04320    if (chan->tech->setoption) {
04321       res = chan->tech->setoption(chan, option, data, datalen);
04322       if (res < 0)
04323          return res;
04324    } else {
04325       errno = ENOSYS;
04326       return -1;
04327    }
04328    if (block) {
04329       /* XXX Implement blocking -- just wait for our option frame reply, discarding
04330          intermediate packets. XXX */
04331       ast_log(LOG_ERROR, "XXX Blocking not implemented yet XXX\n");
04332       return -1;
04333    }
04334    return 0;
04335 }

void ast_channel_setwhentohangup ( struct ast_channel chan,
time_t  offset 
)

Set when to hang a channel up.

Parameters:
chan channel on which to check for hang up
offset offset in seconds from current time of when to hang up This function sets the absolute time out on a channel (when to hang up).

Definition at line 467 of file channel.c.

References ast_null_frame, ast_queue_frame(), and ast_channel::whentohangup.

Referenced by action_timeout(), and timeout_write().

00468 {
00469    chan->whentohangup = offset ? time(NULL) + offset : 0;
00470    ast_queue_frame(chan, &ast_null_frame);
00471    return;
00472 }

struct ast_silence_generator* ast_channel_start_silence_generator ( struct ast_channel chan  ) 

Starts a silence generator on the given channel.

Parameters:
chan The channel to generate silence on
Returns:
An ast_silence_generator pointer, or NULL if an error occurs
This function will cause SLINEAR silence to be generated on the supplied channel until it is disabled; if the channel cannot be put into SLINEAR mode then the function will fail.

The pointer returned by this function must be preserved and passed to ast_channel_stop_silence_generator when you wish to stop the silence generation.

Definition at line 4644 of file channel.c.

References ast_activate_generator(), ast_calloc, AST_FORMAT_SLINEAR, ast_log(), ast_set_write_format(), free, LOG_DEBUG, LOG_ERROR, ast_channel::name, ast_silence_generator::old_write_format, option_debug, silence_generator, and ast_channel::writeformat.

Referenced by __ast_play_and_record(), ast_dtmf_stream(), and channel_spy().

04645 {
04646    struct ast_silence_generator *state;
04647 
04648    if (!(state = ast_calloc(1, sizeof(*state)))) {
04649       return NULL;
04650    }
04651 
04652    state->old_write_format = chan->writeformat;
04653 
04654    if (ast_set_write_format(chan, AST_FORMAT_SLINEAR) < 0) {
04655       ast_log(LOG_ERROR, "Could not set write format to SLINEAR\n");
04656       free(state);
04657       return NULL;
04658    }
04659 
04660    ast_activate_generator(chan, &silence_generator, state);
04661 
04662    if (option_debug)
04663       ast_log(LOG_DEBUG, "Started silence generator on '%s'\n", chan->name);
04664 
04665    return state;
04666 }

void ast_channel_stop_silence_generator ( struct ast_channel chan,
struct ast_silence_generator state 
)

Stops a previously-started silence generator on the given channel.

Parameters:
chan The channel to operate on
state The ast_silence_generator pointer return by a previous call to ast_channel_start_silence_generator.
Returns:
nothing
This function will stop the operating silence generator and return the channel to its previous write format.

Definition at line 4668 of file channel.c.

References ast_deactivate_generator(), ast_log(), ast_set_write_format(), free, LOG_DEBUG, LOG_ERROR, ast_channel::name, ast_silence_generator::old_write_format, and option_debug.

Referenced by __ast_play_and_record(), ast_dtmf_stream(), and channel_spy().

04669 {
04670    if (!state)
04671       return;
04672 
04673    ast_deactivate_generator(chan);
04674 
04675    if (option_debug)
04676       ast_log(LOG_DEBUG, "Stopped silence generator on '%s'\n", chan->name);
04677 
04678    if (ast_set_write_format(chan, state->old_write_format) < 0)
04679       ast_log(LOG_ERROR, "Could not return write format to its original state\n");
04680 
04681    free(state);
04682 }

int ast_channel_supports_html ( struct ast_channel channel  ) 

Returns 0 if channel does not support HTML or non-zero if it does

Definition at line 3267 of file channel.c.

References ast_channel_tech::send_html, and ast_channel::tech.

Referenced by sendurl_exec(), and try_calling().

03268 {
03269    return (chan->tech->send_html) ? 1 : 0;
03270 }

void ast_channel_undefer_dtmf ( struct ast_channel chan  ) 

Unset defer DTMF flag on channel.

Undo defer. ast_read will return any dtmf characters that were queued

Definition at line 1019 of file channel.c.

References ast_clear_flag, and AST_FLAG_DEFER_DTMF.

Referenced by __adsi_transmit_messages(), find_cache(), and rpt_call().

01020 {
01021    if (chan)
01022       ast_clear_flag(chan, AST_FLAG_DEFER_DTMF);
01023 }

void ast_channel_unregister ( const struct ast_channel_tech tech  ) 

Unregister a channel technology.

Parameters:
tech Structure defining channel technology or "type" that was previously registered
Returns:
No return value.

Definition at line 529 of file channel.c.

References AST_LIST_LOCK, AST_LIST_REMOVE_CURRENT, AST_LIST_TRAVERSE_SAFE_BEGIN, AST_LIST_TRAVERSE_SAFE_END, AST_LIST_UNLOCK, ast_log(), ast_verbose(), free, chanlist::list, LOG_DEBUG, option_debug, option_verbose, chanlist::tech, ast_channel_tech::type, and VERBOSE_PREFIX_2.

Referenced by __unload_module(), and unload_module().

00530 {
00531    struct chanlist *chan;
00532 
00533    if (option_debug)
00534       ast_log(LOG_DEBUG, "Unregistering channel type '%s'\n", tech->type);
00535 
00536    AST_LIST_LOCK(&channels);
00537 
00538    AST_LIST_TRAVERSE_SAFE_BEGIN(&backends, chan, list) {
00539       if (chan->tech == tech) {
00540          AST_LIST_REMOVE_CURRENT(&backends, list);
00541          free(chan);
00542          if (option_verbose > 1)
00543             ast_verbose(VERBOSE_PREFIX_2 "Unregistered channel type '%s'\n", tech->type);
00544          break;   
00545       }
00546    }
00547    AST_LIST_TRAVERSE_SAFE_END
00548 
00549    AST_LIST_UNLOCK(&channels);
00550 }

struct ast_channel* ast_channel_walk_locked ( const struct ast_channel prev  ) 

Browse channels in use Browse the channels currently in use.

Parameters:
prev where you want to start in the channel list
Returns:
Returns the next channel in the list, NULL on end. If it returns a channel, that channel *has been locked*!

Definition at line 1135 of file channel.c.

References channel_find_locked().

Referenced by action_status(), ast_complete_channels(), ast_pickup_call(), complete_ch_helper(), conf_exec(), handle_chanlist(), handle_chanlist_deprecated(), handle_core_set_debug_channel(), handle_debugchan_deprecated(), handle_nodebugchan_deprecated(), next_channel(), pickup_by_exten(), pickup_by_mark(), and softhangup_exec().

01136 {
01137    return channel_find_locked(prev, NULL, 0, NULL, NULL);
01138 }

void ast_channels_init ( void   ) 

Provided by channel.c

Definition at line 4568 of file channel.c.

References ast_cli_register_multiple(), and cli_channel.

Referenced by main().

04569 {
04570    ast_cli_register_multiple(cli_channel, sizeof(cli_channel) / sizeof(struct ast_cli_entry));
04571 }

struct ast_variable* ast_channeltype_list ( void   ) 

return an ast_variable list of channeltypes

Definition at line 163 of file channel.c.

References AST_LIST_TRAVERSE, ast_variable_new(), ast_channel_tech::description, chanlist::list, chanlist::tech, ast_channel_tech::type, and var.

00164 {
00165    struct chanlist *cl;
00166    struct ast_variable *var=NULL, *prev = NULL;
00167    AST_LIST_TRAVERSE(&backends, cl, list) {
00168       if (prev)  {
00169          if ((prev->next = ast_variable_new(cl->tech->type, cl->tech->description)))
00170             prev = prev->next;
00171       } else {
00172          var = ast_variable_new(cl->tech->type, cl->tech->description);
00173          prev = var;
00174       }
00175    }
00176    return var;
00177 }

int ast_check_hangup ( struct ast_channel chan  ) 

Check to see if a channel is needing hang up.

Parameters:
chan channel on which to check for hang up This function determines if the channel is being requested to be hung up.
Returns:
Returns 0 if not, or 1 if hang up is requested (including time-out).

Definition at line 385 of file channel.c.

References ast_channel::_softhangup, AST_SOFTHANGUP_TIMEOUT, ast_channel::tech_pvt, and ast_channel::whentohangup.

Referenced by __ast_read(), action_redirect(), agent_indicate(), agi_handle_command(), announce_thread(), app_exec(), ast_answer(), ast_bridge_call(), ast_call(), ast_channel_bridge(), ast_check_hangup_locked(), ast_feature_request_and_dial(), ast_indicate_data(), ast_readstring_full(), ast_recvtext(), ast_rtp_bridge(), ast_sendtext(), ast_transfer(), ast_udptl_bridge(), ast_waitfordigit_full(), ast_write(), bridge_native_loop(), channel_spy(), common_exec(), conf_run(), dahdi_sendtext(), dahdi_setoption(), deadagi_exec(), do_atxfer(), handle_request_invite(), handle_sendimage(), pbx_exec(), rpt(), and wait_for_answer().

00386 {
00387    if (chan->_softhangup)     /* yes if soft hangup flag set */
00388       return 1;
00389    if (!chan->tech_pvt)    /* yes if no technology private data */
00390       return 1;
00391    if (!chan->whentohangup)   /* no if no hangup scheduled */
00392       return 0;
00393    if (chan->whentohangup > time(NULL))   /* no if hangup time has not come yet. */
00394       return 0;
00395    chan->_softhangup |= AST_SOFTHANGUP_TIMEOUT; /* record event */
00396    return 1;
00397 }

static int ast_check_hangup_locked ( struct ast_channel chan  )  [static]

Definition at line 399 of file channel.c.

References ast_channel_lock, ast_channel_unlock, and ast_check_hangup().

Referenced by ast_channel_bridge().

00400 {
00401    int res;
00402    ast_channel_lock(chan);
00403    res = ast_check_hangup(chan);
00404    ast_channel_unlock(chan);
00405    return res;
00406 }

void ast_deactivate_generator ( struct ast_channel chan  ) 

Deactive an active generator

Definition at line 1586 of file channel.c.

References ast_channel_lock, ast_channel_unlock, ast_clear_flag, AST_FLAG_WRITE_INT, AST_GENERATOR_FD, ast_settimeout(), ast_channel::fds, ast_channel::generator, ast_channel::generatordata, and ast_generator::release.

Referenced by __ast_read(), app_exec(), ast_channel_stop_silence_generator(), ast_openstream_full(), ast_playtones_stop(), ast_quiet_chan(), ast_read_generator_actions(), ast_tonepair_stop(), ast_write(), cb_events(), channel_spy(), generator_force(), local_ast_moh_stop(), old_milliwatt_exec(), and wait_for_answer().

01587 {
01588    ast_channel_lock(chan);
01589    if (chan->generatordata) {
01590       if (chan->generator && chan->generator->release)
01591          chan->generator->release(chan, chan->generatordata);
01592       chan->generatordata = NULL;
01593       chan->generator = NULL;
01594       chan->fds[AST_GENERATOR_FD] = -1;
01595       ast_clear_flag(chan, AST_FLAG_WRITE_INT);
01596       ast_settimeout(chan, 0, NULL, NULL);
01597    }
01598    ast_channel_unlock(chan);
01599 }

int ast_do_masquerade ( struct ast_channel original  ) 

Start masquerading a channel XXX This is a seriously wacked out operation. We're essentially putting the guts of the clone channel into the original channel. Start by killing off the original channel's backend. I'm not sure we're going to keep this function, because while the features are nice, the cost is very high in terms of pure nastiness. XXX.

Note:
Assumes channel will be locked when called

Definition at line 3505 of file channel.c.

References ast_channel::_softhangup, ast_channel::_state, ast_channel::adsicpe, ast_channel::alertpipe, ast_app_group_update(), ast_cause2str(), ast_channel_free(), ast_channel_lock, ast_channel_unlock, ast_copy_string(), AST_FLAG_BLOCKING, AST_FLAG_EXCEPTION, AST_FLAG_OUTGOING, AST_FLAG_ZOMBIE, AST_GENERATOR_FD, ast_indicate(), AST_LIST_APPEND_LIST, AST_LIST_FIRST, AST_LIST_HEAD_NOLOCK, AST_LIST_HEAD_SET_NOLOCK, AST_LIST_INSERT_TAIL, AST_LIST_REMOVE_HEAD, AST_LIST_TRAVERSE, ast_log(), AST_MAX_FDS, ast_null_frame, ast_queue_frame(), ast_set_flag, ast_set_read_format(), ast_set_write_format(), AST_SOFTHANGUP_DEV, ast_string_field_set, ast_test_flag, AST_TIMING_FD, ast_channel::blocker, ast_channel::cdr, ast_datastore_info::chan_fixup, ast_channel::cid, clone_variables(), ast_datastore::data, ast_channel::datastores, ast_datastore::entry, errno, ast_channel::fdno, ast_channel::fds, ast_channel_tech::fixup, free_translation(), ast_channel_tech::hangup, ast_datastore::info, language, ast_channel::language, ast_channel::lock, LOG_DEBUG, manager_event(), ast_channel::masq, ast_channel::masqr, ast_channel::monitor, musicclass, ast_channel::name, name, ast_channel::nativeformats, option_debug, ast_channel::rawreadformat, ast_channel::rawwriteformat, ast_channel::readformat, ast_channel::readq, t, ast_channel::tech, ast_channel::tech_pvt, ast_channel::timingfd, ast_channel_tech::type, ast_channel::uniqueid, ast_channel::visible_indication, and ast_channel::writeformat.

Referenced by __ast_read(), ast_async_goto(), ast_hangup(), ast_waitfor_nandfds(), ast_write(), iax_park(), sip_park(), and sip_park_thread().

03506 {
03507    int x,i;
03508    int res=0;
03509    int origstate;
03510    struct ast_frame *cur;
03511    const struct ast_channel_tech *t;
03512    void *t_pvt;
03513    struct ast_callerid tmpcid;
03514    struct ast_channel *clone = original->masq;
03515    struct ast_cdr *cdr;
03516    int rformat = original->readformat;
03517    int wformat = original->writeformat;
03518    char newn[100];
03519    char orig[100];
03520    char masqn[100];
03521    char zombn[100];
03522 
03523    if (option_debug > 3)
03524       ast_log(LOG_DEBUG, "Actually Masquerading %s(%d) into the structure of %s(%d)\n",
03525          clone->name, clone->_state, original->name, original->_state);
03526 
03527    /* XXX This is a seriously wacked out operation.  We're essentially putting the guts of
03528       the clone channel into the original channel.  Start by killing off the original
03529       channel's backend.   I'm not sure we're going to keep this function, because
03530       while the features are nice, the cost is very high in terms of pure nastiness. XXX */
03531 
03532    /* We need the clone's lock, too */
03533    ast_channel_lock(clone);
03534 
03535    if (option_debug > 1)
03536       ast_log(LOG_DEBUG, "Got clone lock for masquerade on '%s' at %p\n", clone->name, &clone->lock);
03537 
03538    /* Having remembered the original read/write formats, we turn off any translation on either
03539       one */
03540    free_translation(clone);
03541    free_translation(original);
03542 
03543 
03544    /* Unlink the masquerade */
03545    original->masq = NULL;
03546    clone->masqr = NULL;
03547    
03548    /* Save the original name */
03549    ast_copy_string(orig, original->name, sizeof(orig));
03550    /* Save the new name */
03551    ast_copy_string(newn, clone->name, sizeof(newn));
03552    /* Create the masq name */
03553    snprintf(masqn, sizeof(masqn), "%s<MASQ>", newn);
03554       
03555    /* Copy the name from the clone channel */
03556    ast_string_field_set(original, name, newn);
03557 
03558    /* Mangle the name of the clone channel */
03559    ast_string_field_set(clone, name, masqn);
03560    
03561    /* Notify any managers of the change, first the masq then the other */
03562    manager_event(EVENT_FLAG_CALL, "Rename", "Oldname: %s\r\nNewname: %s\r\nUniqueid: %s\r\n", newn, masqn, clone->uniqueid);
03563    manager_event(EVENT_FLAG_CALL, "Rename", "Oldname: %s\r\nNewname: %s\r\nUniqueid: %s\r\n", orig, newn, original->uniqueid);
03564 
03565    /* Swap the technologies */   
03566    t = original->tech;
03567    original->tech = clone->tech;
03568    clone->tech = t;
03569 
03570    /* Swap the cdrs */
03571    cdr = original->cdr;
03572    original->cdr = clone->cdr;
03573    clone->cdr = cdr;
03574 
03575    t_pvt = original->tech_pvt;
03576    original->tech_pvt = clone->tech_pvt;
03577    clone->tech_pvt = t_pvt;
03578 
03579    /* Swap the alertpipes */
03580    for (i = 0; i < 2; i++) {
03581       x = original->alertpipe[i];
03582       original->alertpipe[i] = clone->alertpipe[i];
03583       clone->alertpipe[i] = x;
03584    }
03585 
03586    /* 
03587     * Swap the readq's.  The end result should be this:
03588     *
03589     *  1) All frames should be on the new (original) channel.
03590     *  2) Any frames that were already on the new channel before this
03591     *     masquerade need to be at the end of the readq, after all of the
03592     *     frames on the old (clone) channel.
03593     *  3) The alertpipe needs to get poked for every frame that was already
03594     *     on the new channel, since we are now using the alert pipe from the
03595     *     old (clone) channel.
03596     */
03597    {
03598       AST_LIST_HEAD_NOLOCK(, ast_frame) tmp_readq;
03599       AST_LIST_HEAD_SET_NOLOCK(&tmp_readq, NULL);
03600 
03601       AST_LIST_APPEND_LIST(&tmp_readq, &original->readq, frame_list);
03602       AST_LIST_APPEND_LIST(&original->readq, &clone->readq, frame_list);
03603 
03604       while ((cur = AST_LIST_REMOVE_HEAD(&tmp_readq, frame_list))) {
03605          AST_LIST_INSERT_TAIL(&original->readq, cur, frame_list);
03606          if (original->alertpipe[1] > -1) {
03607             int poke = 0;
03608 
03609             if (write(original->alertpipe[1], &poke, sizeof(poke)) < 0) {
03610                ast_log(LOG_WARNING, "write() failed: %s\n", strerror(errno));
03611             }
03612          }
03613       }
03614    }
03615 
03616    /* Swap the raw formats */
03617    x = original->rawreadformat;
03618    original->rawreadformat = clone->rawreadformat;
03619    clone->rawreadformat = x;
03620    x = original->rawwriteformat;
03621    original->rawwriteformat = clone->rawwriteformat;
03622    clone->rawwriteformat = x;
03623 
03624    clone->_softhangup = AST_SOFTHANGUP_DEV;
03625 
03626    /* And of course, so does our current state.  Note we need not
03627       call ast_setstate since the event manager doesn't really consider
03628       these separate.  We do this early so that the clone has the proper
03629       state of the original channel. */
03630    origstate = original->_state;
03631    original->_state = clone->_state;
03632    clone->_state = origstate;
03633 
03634    if (clone->tech->fixup){
03635       res = clone->tech->fixup(original, clone);
03636       if (res)
03637          ast_log(LOG_WARNING, "Fixup failed on channel %s, strange things may happen.\n", clone->name);
03638    }
03639 
03640    /* Start by disconnecting the original's physical side */
03641    if (clone->tech->hangup)
03642       res = clone->tech->hangup(clone);
03643    if (res) {
03644       ast_log(LOG_WARNING, "Hangup failed!  Strange things may happen!\n");
03645       ast_channel_unlock(clone);
03646       return -1;
03647    }
03648    
03649    snprintf(zombn, sizeof(zombn), "%s<ZOMBIE>", orig);
03650    /* Mangle the name of the clone channel */
03651    ast_string_field_set(clone, name, zombn);
03652    manager_event(EVENT_FLAG_CALL, "Rename", "Oldname: %s\r\nNewname: %s\r\nUniqueid: %s\r\n", masqn, zombn, clone->uniqueid);
03653 
03654    /* Update the type. */
03655    t_pvt = original->monitor;
03656    original->monitor = clone->monitor;
03657    clone->monitor = t_pvt;
03658    
03659    /* Keep the same language.  */
03660    ast_string_field_set(original, language, clone->language);
03661    /* Copy the FD's other than the generator fd */
03662    for (x = 0; x < AST_MAX_FDS; x++) {
03663       if (x != AST_GENERATOR_FD)
03664          original->fds[x] = clone->fds[x];
03665    }
03666 
03667    ast_app_group_update(clone, original);
03668    /* Move data stores over */
03669    if (AST_LIST_FIRST(&clone->datastores)) {
03670       struct ast_datastore *ds;
03671       AST_LIST_TRAVERSE(&clone->datastores, ds, entry) {
03672          if (ds->info->chan_fixup)
03673             ds->info->chan_fixup(ds->data, clone, original);
03674       }
03675       AST_LIST_APPEND_LIST(&original->datastores, &clone->datastores, entry);
03676    }
03677 
03678    clone_variables(original, clone);
03679    /* Presense of ADSI capable CPE follows clone */
03680    original->adsicpe = clone->adsicpe;
03681    /* Bridge remains the same */
03682    /* CDR fields remain the same */
03683    /* XXX What about blocking, softhangup, blocker, and lock and blockproc? XXX */
03684    /* Application and data remain the same */
03685    /* Clone exception  becomes real one, as with fdno */
03686    ast_set_flag(original, ast_test_flag(clone, AST_FLAG_OUTGOING | AST_FLAG_EXCEPTION));
03687    original->fdno = clone->fdno;
03688    /* Schedule context remains the same */
03689    /* Stream stuff stays the same */
03690    /* Keep the original state.  The fixup code will need to work with it most likely */
03691 
03692    /* Just swap the whole structures, nevermind the allocations, they'll work themselves
03693       out. */
03694    tmpcid = original->cid;
03695    original->cid = clone->cid;
03696    clone->cid = tmpcid;
03697    
03698    /* Restore original timing file descriptor */
03699    original->fds[AST_TIMING_FD] = original->timingfd;
03700    
03701    /* Our native formats are different now */
03702    original->nativeformats = clone->nativeformats;
03703    
03704    /* Context, extension, priority, app data, jump table,  remain the same */
03705    /* pvt switches.  pbx stays the same, as does next */
03706    
03707    /* Set the write format */
03708    ast_set_write_format(original, wformat);
03709 
03710    /* Set the read format */
03711    ast_set_read_format(original, rformat);
03712 
03713    /* Copy the music class */
03714    ast_string_field_set(original, musicclass, clone->musicclass);
03715 
03716    if (option_debug)
03717       ast_log(LOG_DEBUG, "Putting channel %s in %d/%d formats\n", original->name, wformat, rformat);
03718 
03719    /* Okay.  Last thing is to let the channel driver know about all this mess, so he
03720       can fix up everything as best as possible */
03721    if (original->tech->fixup) {
03722       res = original->tech->fixup(clone, original);
03723       if (res) {
03724          ast_log(LOG_WARNING, "Channel for type '%s' could not fixup channel %s\n",
03725             original->tech->type, original->name);
03726          ast_channel_unlock(clone);
03727          return -1;
03728       }
03729    } else
03730       ast_log(LOG_WARNING, "Channel type '%s' does not have a fixup routine (for %s)!  Bad things may happen.\n",
03731          original->tech->type, original->name);
03732 
03733    /* 
03734     * If an indication is currently playing, maintain it on the channel 
03735     * that is taking the place of original 
03736     *
03737     * This is needed because the masquerade is swapping out in the internals
03738     * of this channel, and the new channel private data needs to be made
03739     * aware of the current visible indication (RINGING, CONGESTION, etc.)
03740     */
03741    if (original->visible_indication) {
03742       ast_indicate(original, original->visible_indication);
03743    }
03744    
03745    /* Now, at this point, the "clone" channel is totally F'd up.  We mark it as
03746       a zombie so nothing tries to touch it.  If it's already been marked as a
03747       zombie, then free it now (since it already is considered invalid). */
03748    if (ast_test_flag(clone, AST_FLAG_ZOMBIE)) {
03749       if (option_debug)
03750          ast_log(LOG_DEBUG, "Destroying channel clone '%s'\n", clone->name);
03751       ast_channel_unlock(clone);
03752       manager_event(EVENT_FLAG_CALL, "Hangup",
03753          "Channel: %s\r\n"
03754          "Uniqueid: %s\r\n"
03755          "Cause: %d\r\n"
03756          "Cause-txt: %s\r\n",
03757          clone->name,
03758          clone->uniqueid,
03759          clone->hangupcause,
03760          ast_cause2str(clone->hangupcause)
03761          );
03762       ast_channel_free(clone);
03763    } else {
03764       if (option_debug)
03765          ast_log(LOG_DEBUG, "Released clone lock on '%s'\n", clone->name);
03766       ast_set_flag(clone, AST_FLAG_ZOMBIE);
03767       ast_queue_frame(clone, &ast_null_frame);
03768       ast_channel_unlock(clone);
03769    }
03770    
03771    /* Signal any blocker */
03772    if (ast_test_flag(original, AST_FLAG_BLOCKING))
03773       pthread_kill(original->blocker, SIGURG);
03774    if (option_debug)
03775       ast_log(LOG_DEBUG, "Done Masquerading %s (%d)\n", original->name, original->_state);
03776    return 0;
03777 }

static enum ast_bridge_result ast_generic_bridge ( struct ast_channel c0,
struct ast_channel c1,
struct ast_bridge_config config,
struct ast_frame **  fo,
struct ast_channel **  rc,
struct timeval  bridge_end 
) [static]

Definition at line 3890 of file channel.c.

References AST_BRIDGE_COMPLETE, AST_BRIDGE_DTMF_CHANNEL_0, AST_BRIDGE_DTMF_CHANNEL_1, AST_BRIDGE_RETRY, ast_jb_do_usecheck(), ast_jb_empty_and_reset(), ast_tvdiff_ms(), ast_tvnow(), config, f, ast_channel::nativeformats, and ast_channel::tech_pvt.

Referenced by ast_channel_bridge().

03893 {
03894    /* Copy voice back and forth between the two channels. */
03895    struct ast_channel *cs[3];
03896    struct ast_frame *f;
03897    enum ast_bridge_result res = AST_BRIDGE_COMPLETE;
03898    int o0nativeformats;
03899    int o1nativeformats;
03900    int watch_c0_dtmf;
03901    int watch_c1_dtmf;
03902    void *pvt0, *pvt1;
03903    /* Indicates whether a frame was queued into a jitterbuffer */
03904    int frame_put_in_jb = 0;
03905    int jb_in_use;
03906    int to;
03907    
03908    cs[0] = c0;
03909    cs[1] = c1;
03910    pvt0 = c0->tech_pvt;
03911    pvt1 = c1->tech_pvt;
03912    o0nativeformats = c0->nativeformats;
03913    o1nativeformats = c1->nativeformats;
03914    watch_c0_dtmf = config->flags & AST_BRIDGE_DTMF_CHANNEL_0;
03915    watch_c1_dtmf = config->flags & AST_BRIDGE_DTMF_CHANNEL_1;
03916 
03917    /* Check the need of a jitterbuffer for each channel */
03918    jb_in_use = ast_jb_do_usecheck(c0, c1);
03919    if (jb_in_use)
03920       ast_jb_empty_and_reset(c0, c1);
03921 
03922    for (;;) {
03923       struct ast_channel *who, *other;
03924 
03925       if ((c0->tech_pvt != pvt0) || (c1->tech_pvt != pvt1) ||
03926           (o0nativeformats != c0->nativeformats) ||
03927           (o1nativeformats != c1->nativeformats)) {
03928          /* Check for Masquerade, codec changes, etc */
03929          res = AST_BRIDGE_RETRY;
03930          break;
03931       }
03932       if (bridge_end.tv_sec) {
03933          to = ast_tvdiff_ms(bridge_end, ast_tvnow());
03934          if (to <= 0) {
03935             if (config->timelimit)
03936                res = AST_BRIDGE_RETRY;
03937             else
03938                res = AST_BRIDGE_COMPLETE;
03939             break;
03940          }
03941       } else
03942          to = -1;
03943       /* Calculate the appropriate max sleep interval - in general, this is the time,
03944          left to the closest jb delivery moment */
03945       if (jb_in_use)
03946          to = ast_jb_get_when_to_wakeup(c0, c1, to);
03947       who = ast_waitfor_n(cs, 2, &to);
03948       if (!who) {
03949          /* No frame received within the specified timeout - check if we have to deliver now */
03950          if (jb_in_use)
03951             ast_jb_get_and_deliver(c0, c1);
03952          if (c0->_softhangup == AST_SOFTHANGUP_UNBRIDGE || c1->_softhangup == AST_SOFTHANGUP_UNBRIDGE) {
03953             if (c0->_softhangup == AST_SOFTHANGUP_UNBRIDGE)
03954                c0->_softhangup = 0;
03955             if (c1->_softhangup == AST_SOFTHANGUP_UNBRIDGE)
03956                c1->_softhangup = 0;
03957             c0->_bridge = c1;
03958             c1->_bridge = c0;
03959          }
03960          continue;
03961       }
03962       f = ast_read(who);
03963       if (!f) {
03964          *fo = NULL;
03965          *rc = who;
03966          if (option_debug)
03967             ast_log(LOG_DEBUG, "Didn't get a frame from channel: %s\n",who->name);
03968          break;
03969       }
03970 
03971       other = (who == c0) ? c1 : c0; /* the 'other' channel */
03972       /* Try add the frame info the who's bridged channel jitterbuff */
03973       if (jb_in_use)
03974          frame_put_in_jb = !ast_jb_put(other, f);
03975 
03976       if ((f->frametype == AST_FRAME_CONTROL) && !(config->flags & AST_BRIDGE_IGNORE_SIGS)) {
03977          int bridge_exit = 0;
03978 
03979          switch (f->subclass) {
03980          case AST_CONTROL_HOLD:
03981          case AST_CONTROL_UNHOLD:
03982          case AST_CONTROL_VIDUPDATE:
03983          case AST_CONTROL_SRCUPDATE:
03984             ast_indicate_data(other, f->subclass, f->data, f->datalen);
03985             if (jb_in_use) {
03986                ast_jb_empty_and_reset(c0, c1);
03987             }
03988             break;
03989          default:
03990             *fo = f;
03991             *rc = who;
03992             bridge_exit = 1;
03993             if (option_debug)
03994                ast_log(LOG_DEBUG, "Got a FRAME_CONTROL (%d) frame on channel %s\n", f->subclass, who->name);
03995             break;
03996          }
03997          if (bridge_exit)
03998             break;
03999       }
04000       if ((f->frametype == AST_FRAME_VOICE) ||
04001           (f->frametype == AST_FRAME_DTMF_BEGIN) ||
04002           (f->frametype == AST_FRAME_DTMF) ||
04003           (f->frametype == AST_FRAME_VIDEO) ||
04004           (f->frametype == AST_FRAME_IMAGE) ||
04005           (f->frametype == AST_FRAME_HTML) ||
04006           (f->frametype == AST_FRAME_MODEM) ||
04007           (f->frametype == AST_FRAME_TEXT)) {
04008          /* monitored dtmf causes exit from bridge */
04009          int monitored_source = (who == c0) ? watch_c0_dtmf : watch_c1_dtmf;
04010 
04011          if (monitored_source && 
04012             (f->frametype == AST_FRAME_DTMF_END || 
04013             f->frametype == AST_FRAME_DTMF_BEGIN)) {
04014             *fo = f;
04015             *rc = who;
04016             if (option_debug)
04017                ast_log(LOG_DEBUG, "Got DTMF %s on channel (%s)\n", 
04018                   f->frametype == AST_FRAME_DTMF_END ? "end" : "begin",
04019                   who->name);
04020             break;
04021          }
04022          /* Write immediately frames, not passed through jb */
04023          if (!frame_put_in_jb)
04024             ast_write(other, f);
04025             
04026          /* Check if we have to deliver now */
04027          if (jb_in_use)
04028             ast_jb_get_and_deliver(c0, c1);
04029       }
04030       /* XXX do we want to pass on also frames not matched above ? */
04031       ast_frfree(f);
04032 
04033       /* Swap who gets priority */
04034       cs[2] = cs[0];
04035       cs[0] = cs[1];
04036       cs[1] = cs[2];
04037    }
04038    return res;
04039 }

struct ast_channel* ast_get_channel_by_exten_locked ( const char *  exten,
const char *  context 
)

Get channel by exten (and optionally context) and lock it.

Definition at line 1160 of file channel.c.

References channel_find_locked().

01161 {
01162    return channel_find_locked(NULL, NULL, 0, context, exten);
01163 }

struct ast_channel* ast_get_channel_by_name_locked ( const char *  name  ) 

Get channel by name (locks channel).

Definition at line 1141 of file channel.c.

References channel_find_locked().

Referenced by action_atxfer(), action_getvar(), action_hangup(), action_redirect(), action_setcdruserfield(), action_setvar(), action_status(), action_timeout(), ast_async_goto_by_name(), ast_bridge_call(), asyncgoto_exec(), change_monitor_action(), do_pause_or_unpause(), get_zap_channel_locked(), handle_channelstatus(), handle_core_set_debug_channel(), handle_debugchan_deprecated(), handle_getvariablefull(), handle_hangup(), handle_nodebugchan_deprecated(), handle_showchan(), handle_showchan_deprecated(), handle_softhangup(), manager_park(), manager_play_dtmf(), park_call_full(), pbx_builtin_importvar(), start_monitor_action(), and stop_monitor_action().

01142 {
01143    return channel_find_locked(NULL, name, 0, NULL, NULL);
01144 }

struct ast_channel* ast_get_channel_by_name_prefix_locked ( const char *  name,
const int  namelen 
)

Get channel by name prefix (locks channel).

Definition at line 1147 of file channel.c.

References channel_find_locked().

Referenced by ast_parse_device_state(), common_exec(), and mixmonitor_cli().

01148 {
01149    return channel_find_locked(NULL, name, namelen, NULL, NULL);
01150 }

struct ast_channel_tech* ast_get_channel_tech ( const char *  name  ) 

Get a channel technology structure by name.

Parameters:
name name of technology to find
Returns:
a pointer to the structure, or NULL if no matching technology found

Definition at line 552 of file channel.c.

References AST_LIST_LOCK, AST_LIST_TRAVERSE, AST_LIST_UNLOCK, ast_log(), chanlist::list, LOG_WARNING, chanlist::tech, and ast_channel_tech::type.

Referenced by ast_device_state().

00553 {
00554    struct chanlist *chanls;
00555    const struct ast_channel_tech *ret = NULL;
00556 
00557    if (AST_LIST_LOCK(&channels)) {
00558       ast_log(LOG_WARNING, "Unable to lock channel tech list\n");
00559       return NULL;
00560    }
00561 
00562    AST_LIST_TRAVERSE(&backends, chanls, list) {
00563       if (!strcasecmp(name, chanls->tech->type)) {
00564          ret = chanls->tech;
00565          break;
00566       }
00567    }
00568 
00569    AST_LIST_UNLOCK(&channels);
00570    
00571    return ret;
00572 }

ast_group_t ast_get_group ( const char *  s  ) 

Definition at line 4489 of file channel.c.

References ast_log(), ast_strdupa, ast_strlen_zero(), group, and LOG_ERROR.

Referenced by _parse(), build_device(), build_gateway(), build_peer(), build_user(), func_channel_write(), process_dahdi(), and read_agent_config().

04490 {
04491    char *piece;
04492    char *c;
04493    int start=0, finish=0, x;
04494    ast_group_t group = 0;
04495 
04496    if (ast_strlen_zero(s))
04497       return 0;
04498 
04499    c = ast_strdupa(s);
04500    
04501    while ((piece = strsep(&c, ","))) {
04502       if (sscanf(piece, "%d-%d", &start, &finish) == 2) {
04503          /* Range */
04504       } else if (sscanf(piece, "%d", &start)) {
04505          /* Just one */
04506          finish = start;
04507       } else {
04508          ast_log(LOG_ERROR, "Syntax error parsing group configuration '%s' at '%s'. Ignoring.\n", s, piece);
04509          continue;
04510       }
04511       for (x = start; x <= finish; x++) {
04512          if ((x > 63) || (x < 0)) {
04513             ast_log(LOG_WARNING, "Ignoring invalid group %d (maximum group is 63)\n", x);
04514          } else
04515             group |= ((ast_group_t) 1 << x);
04516       }
04517    }
04518    return group;
04519 }

int ast_hangup ( struct ast_channel chan  ) 

Hang up a channel.

Note:
This function performs a hard hangup on a channel. Unlike the soft-hangup, this function performs all stream stopping, etc, on the channel that needs to end. chan is no longer valid after this call.
Parameters:
chan channel to hang up
Returns:
Returns 0 on success, -1 on failure.

Definition at line 1459 of file channel.c.

References ast_assert, ast_audiohook_detach_list(), ast_autoservice_stop(), ast_cause2str(), ast_cdr_detach(), ast_cdr_end(), AST_CDR_FLAG_BRIDGED, AST_CDR_FLAG_DIALED, AST_CDR_FLAG_POST_DISABLED, AST_CDR_NULL, ast_channel_free(), ast_channel_lock, ast_channel_unlock, ast_closestream(), ast_do_masquerade(), AST_FLAG_BLOCKING, AST_FLAG_ZOMBIE, ast_log(), ast_set_flag, ast_test_flag, ast_channel::audiohooks, ast_channel::blocker, ast_channel::blockproc, ast_channel::cdr, ast_cdr::disposition, free_translation(), ast_channel::generator, ast_channel::generatordata, ast_channel_tech::hangup, ast_channel::hangupcause, LOG_DEBUG, manager_event(), ast_channel::masq, ast_channel::masqr, ast_channel::name, option_debug, ast_generator::release, ast_channel::sched, sched_context_destroy(), ast_channel::stream, ast_channel::tech, ast_channel::uniqueid, and ast_channel::vstream.

Referenced by __ast_request_and_dial(), __oh323_new(), agent_hangup(), agent_read(), alsa_new(), answer_exec_run(), app_exec(), ast_async_goto(), ast_bridge_call_thread(), ast_dial_destroy(), ast_dial_hangup(), ast_feature_request_and_dial(), ast_iax2_new(), ast_pbx_outgoing_app(), ast_pbx_outgoing_exten(), ast_pbx_run_app(), async_wait(), begin_dial(), build_conf(), chanavail_exec(), check_compat(), check_goto_on_transfer(), clear_caller(), conf_run(), connect_link(), dahdi_handle_event(), dahdi_new(), do_atxfer(), do_hang(), do_idle_thread(), do_parking_thread(), features_hangup(), findmeexec(), gtalk_new(), handle_enbloc_call_message(), handle_frame(), handle_frame_ownerless(), handle_hd_hf(), handle_init_event(), handle_invite_replaces(), handle_offhook_message(), handle_request_invite(), handle_soft_key_event_message(), handle_stimulus_message(), hangup_chan(), hangupcalls(), hanguptree(), iax2_request(), iax_park(), iax_park_thread(), local_attended_transfer(), local_hangup(), masq_park_call(), mgcp_new(), mgcp_ss(), monitor_dial(), nbs_new(), oss_new(), park_exec(), parkandannounce_exec(), phone_new(), rpt(), rpt_call(), rpt_tele_thread(), sip_new(), sip_park(), sip_park_thread(), skinny_new(), skinny_ss(), ss_thread(), try_calling(), wait_for_answer(), and wait_for_winner().

01460 {
01461    int res = 0;
01462 
01463    /* Don't actually hang up a channel that will masquerade as someone else, or
01464       if someone is going to masquerade as us */
01465    ast_channel_lock(chan);
01466 
01467    if (chan->audiohooks) {
01468       ast_audiohook_detach_list(chan->audiohooks);
01469       chan->audiohooks = NULL;
01470    }
01471 
01472    ast_autoservice_stop(chan);
01473 
01474    if (chan->masq) {
01475       if (ast_do_masquerade(chan))
01476          ast_log(LOG_WARNING, "Failed to perform masquerade\n");
01477    }
01478 
01479    if (chan->masq) {
01480       ast_log(LOG_WARNING, "%s getting hung up, but someone is trying to masq into us?!?\n", chan->name);
01481       ast_channel_unlock(chan);
01482       return 0;
01483    }
01484    /* If this channel is one which will be masqueraded into something,
01485       mark it as a zombie already, so we know to free it later */
01486    if (chan->masqr) {
01487       ast_set_flag(chan, AST_FLAG_ZOMBIE);
01488       ast_channel_unlock(chan);
01489       return 0;
01490    }
01491    free_translation(chan);
01492    /* Close audio stream */
01493    if (chan->stream) {
01494       ast_closestream(chan->stream);
01495       chan->stream = NULL;
01496    }
01497    /* Close video stream */
01498    if (chan->vstream) {
01499       ast_closestream(chan->vstream);
01500       chan->vstream = NULL;
01501    }
01502    if (chan->sched) {
01503       sched_context_destroy(chan->sched);
01504       chan->sched = NULL;
01505    }
01506    
01507    if (chan->generatordata)   /* Clear any tone stuff remaining */
01508       chan->generator->release(chan, chan->generatordata);
01509    chan->generatordata = NULL;
01510    chan->generator = NULL;
01511    if (ast_test_flag(chan, AST_FLAG_BLOCKING)) {
01512       ast_log(LOG_WARNING, "Hard hangup called by thread %ld on %s, while fd "
01513                "is blocked by thread %ld in procedure %s!  Expect a failure\n",
01514                (long)pthread_self(), chan->name, (long)chan->blocker, chan->blockproc);
01515       ast_assert(ast_test_flag(chan, AST_FLAG_BLOCKING) == 0);
01516    }
01517    if (!ast_test_flag(chan, AST_FLAG_ZOMBIE)) {
01518       if (option_debug)
01519          ast_log(LOG_DEBUG, "Hanging up channel '%s'\n", chan->name);
01520       if (chan->tech->hangup)
01521          res = chan->tech->hangup(chan);
01522    } else {
01523       if (option_debug)
01524          ast_log(LOG_DEBUG, "Hanging up zombie '%s'\n", chan->name);
01525    }
01526          
01527    ast_channel_unlock(chan);
01528    manager_event(EVENT_FLAG_CALL, "Hangup",
01529          "Channel: %s\r\n"
01530          "Uniqueid: %s\r\n"
01531          "Cause: %d\r\n"
01532          "Cause-txt: %s\r\n",
01533          chan->name,
01534          chan->uniqueid,
01535          chan->hangupcause,
01536          ast_cause2str(chan->hangupcause)
01537          );
01538 
01539    if (chan->cdr && !ast_test_flag(chan->cdr, AST_CDR_FLAG_BRIDGED) && 
01540       !ast_test_flag(chan->cdr, AST_CDR_FLAG_POST_DISABLED) && 
01541        (chan->cdr->disposition != AST_CDR_NULL || ast_test_flag(chan->cdr, AST_CDR_FLAG_DIALED))) {
01542          
01543       ast_cdr_end(chan->cdr);
01544       ast_cdr_detach(chan->cdr);
01545       chan->cdr = NULL;
01546    }
01547    
01548    ast_channel_free(chan);
01549 
01550    return res;
01551 }

int ast_indicate ( struct ast_channel chan,
int  condition 
)

Indicates condition of channel.

Note:
Indicate a condition such as AST_CONTROL_BUSY, AST_CONTROL_RINGING, or AST_CONTROL_CONGESTION on a channel
Parameters:
chan channel to change the indication
condition which condition to indicate on the channel
Returns:
Returns 0 on success, -1 on failure

Definition at line 2442 of file channel.c.

References ast_indicate_data().

Referenced by __ast_play_and_record(), agent_new(), answer_trunk_chan(), ast_answer(), ast_bridge_call(), ast_channel_bridge(), ast_do_masquerade(), ast_dtmf_stream(), ast_feature_request_and_dial(), attempt_transfer(), builtin_blindtransfer(), conf_run(), disa_exec(), do_atxfer(), do_parking_thread(), features_indicate(), finishup(), function_remote(), handle_frame(), handle_recordfile(), mgcp_ss(), monitor_dial(), park_exec(), pbx_builtin_busy(), pbx_builtin_congestion(), pbx_builtin_progress(), pbx_builtin_ringing(), pbx_builtin_waitexten(), queue_exec(), rpt(), send_waveform_to_channel(), skinny_ss(), sla_handle_hold_event(), sla_station_exec(), sla_trunk_exec(), and wait_for_answer().

02443 {
02444    return ast_indicate_data(chan, condition, NULL, 0);
02445 }

int ast_indicate_data ( struct ast_channel chan,
int  condition,
const void *  data,
size_t  datalen 
)

Indicates condition of channel, with payload.

Note:
Indicate a condition such as AST_CONTROL_BUSY, AST_CONTROL_RINGING, or AST_CONTROL_CONGESTION on a channel
Parameters:
chan channel to change the indication
condition which condition to indicate on the channel
data pointer to payload data
datalen size of payload data
Returns:
Returns 0 on success, -1 on failure

Note:
If we compare the enumeration type, which does not have any negative constants, the compiler may optimize this code away. Therefore, we must perform an integer comparison here.

Definition at line 2480 of file channel.c.

References ast_channel_lock, ast_channel_unlock, ast_check_hangup(), AST_CONTROL_ANSWER, AST_CONTROL_BUSY, AST_CONTROL_CONGESTION, AST_CONTROL_FLASH, AST_CONTROL_HANGUP, AST_CONTROL_HOLD, AST_CONTROL_OFFHOOK, AST_CONTROL_OPTION, AST_CONTROL_PROCEEDING, AST_CONTROL_PROGRESS, AST_CONTROL_RADIO_KEY, AST_CONTROL_RADIO_UNKEY, AST_CONTROL_RING, AST_CONTROL_RINGING, AST_CONTROL_SRCUPDATE, AST_CONTROL_TAKEOFFHOOK, AST_CONTROL_UNHOLD, AST_CONTROL_VIDUPDATE, AST_CONTROL_WINK, AST_FLAG_ZOMBIE, ast_get_indication_tone(), ast_log(), ast_playtones_start(), ast_playtones_stop(), ast_test_flag, tone_zone_sound::data, ast_channel_tech::indicate, is_visible_indication(), LOG_DEBUG, ast_channel::name, option_debug, ast_channel::tech, ast_channel::visible_indication, and ast_channel::zone.

Referenced by __login_exec(), agent_hangup(), ast_bridge_call(), ast_indicate(), bridge_native_loop(), do_parking_thread(), park_call_full(), pbx_builtin_waitexten(), and wait_for_answer().

02482 {
02483    /* By using an enum, we'll get compiler warnings for values not handled 
02484     * in switch statements. */
02485    enum ast_control_frame_type condition = _condition;
02486    const struct tone_zone_sound *ts = NULL;
02487    int res = -1;
02488 
02489    ast_channel_lock(chan);
02490 
02491    /* Don't bother if the channel is about to go away, anyway. */
02492    if (ast_test_flag(chan, AST_FLAG_ZOMBIE) || ast_check_hangup(chan)) {
02493       ast_channel_unlock(chan);
02494       return -1;
02495    }
02496 
02497    if (chan->tech->indicate) {
02498       /* See if the channel driver can handle this condition. */
02499       res = chan->tech->indicate(chan, condition, data, datalen);
02500    }
02501 
02502    ast_channel_unlock(chan);
02503 
02504    if (chan->tech->indicate && !res) {
02505       /* The channel driver successfully handled this indication */
02506       if (is_visible_indication(condition)) {
02507          chan->visible_indication = condition;
02508       }
02509       return 0;
02510    }
02511 
02512    /* The channel driver does not support this indication, let's fake
02513     * it by doing our own tone generation if applicable. */
02514 
02515    /*!\note If we compare the enumeration type, which does not have any
02516     * negative constants, the compiler may optimize this code away.
02517     * Therefore, we must perform an integer comparison here. */
02518    if (_condition < 0) {
02519       /* Stop any tones that are playing */
02520       ast_playtones_stop(chan);
02521       return 0;
02522    }
02523 
02524    /* Handle conditions that we have tones for. */
02525    switch (condition) {
02526    case AST_CONTROL_RINGING:
02527       ts = ast_get_indication_tone(chan->zone, "ring");
02528       break;
02529    case AST_CONTROL_BUSY:
02530       ts = ast_get_indication_tone(chan->zone, "busy");
02531       break;
02532    case AST_CONTROL_CONGESTION:
02533       ts = ast_get_indication_tone(chan->zone, "congestion");
02534       break;
02535    case AST_CONTROL_PROGRESS:
02536    case AST_CONTROL_PROCEEDING:
02537    case AST_CONTROL_VIDUPDATE:
02538    case AST_CONTROL_SRCUPDATE:
02539    case AST_CONTROL_RADIO_KEY:
02540    case AST_CONTROL_RADIO_UNKEY:
02541    case AST_CONTROL_OPTION:
02542    case AST_CONTROL_WINK:
02543    case AST_CONTROL_FLASH:
02544    case AST_CONTROL_OFFHOOK:
02545    case AST_CONTROL_TAKEOFFHOOK:
02546    case AST_CONTROL_ANSWER:
02547    case AST_CONTROL_HANGUP:
02548    case AST_CONTROL_RING:
02549    case AST_CONTROL_HOLD:
02550    case AST_CONTROL_UNHOLD:
02551       /* Nothing left to do for these. */
02552       res = 0;
02553       break;
02554    }
02555 
02556    if (ts && ts->data[0]) {
02557       /* We have a tone to play, yay. */
02558       if (option_debug) {
02559             ast_log(LOG_DEBUG, "Driver for channel '%s' does not support indication %d, emulating it\n", chan->name, condition);
02560       }
02561       ast_playtones_start(chan, 0, ts->data, 1);
02562       res = 0;
02563       chan->visible_indication = condition;
02564    }
02565 
02566    if (res) {
02567       /* not handled */
02568       ast_log(LOG_WARNING, "Unable to handle indication %d for '%s'\n", condition, chan->name);
02569    }
02570 
02571    return res;
02572 }

void ast_install_music_functions ( int(*)(struct ast_channel *, const char *, const char *)  start_ptr,
void(*)(struct ast_channel *)  stop_ptr,
void(*)(struct ast_channel *)  cleanup_ptr 
)

Definition at line 4525 of file channel.c.

References ast_moh_cleanup_ptr, ast_moh_start_ptr, and ast_moh_stop_ptr.

Referenced by load_module(), and reload().

04528 {
04529    ast_moh_start_ptr = start_ptr;
04530    ast_moh_stop_ptr = stop_ptr;
04531    ast_moh_cleanup_ptr = cleanup_ptr;
04532 }

int ast_internal_timing_enabled ( struct ast_channel chan  ) 

Check if the channel can run in internal timing mode.

Parameters:
chan The channel to check
Returns:
boolean
This function will return 1 if internal timing is enabled and the timing device is available.

Definition at line 2424 of file channel.c.

References ast_log(), ast_opt_internal_timing, LOG_DEBUG, option_debug, and ast_channel::timingfd.

Referenced by add_sdp(), and ast_read_generator_actions().

02425 {
02426    int ret = ast_opt_internal_timing && chan->timingfd > -1;
02427    if (option_debug > 4)
02428       ast_log(LOG_DEBUG, "Internal timing is %s (option_internal_timing=%d chan->timingfd=%d)\n", ret? "enabled": "disabled", ast_opt_internal_timing, chan->timingfd);
02429    return ret;
02430 }

void ast_moh_cleanup ( struct ast_channel chan  ) 

Definition at line 4562 of file channel.c.

References ast_moh_cleanup_ptr.

Referenced by ast_channel_free().

04563 {
04564    if (ast_moh_cleanup_ptr)
04565       ast_moh_cleanup_ptr(chan);
04566 }

int ast_moh_start ( struct ast_channel chan,
const char *  mclass,
const char *  interpclass 
)

Turn on music on hold on a given channel.

Parameters:
chan The channel structure that will get music on hold
mclass The class to use if the musicclass is not currently set on the channel structure.
interpclass The class to use if the musicclass is not currently set on the channel structure or in the mclass argument.
Return values:
0 success
non-zero failure

Definition at line 4542 of file channel.c.

References ast_moh_start_ptr, ast_verbose(), option_verbose, and VERBOSE_PREFIX_3.

Referenced by alsa_indicate(), app_exec(), cb_events(), conf_run(), dahdi_indicate(), feature_exec_app(), gtalk_indicate(), handle_setmusic(), iax2_indicate(), local_indicate(), mgcp_indicate(), misdn_indication(), moh0_exec(), moh1_exec(), moh3_exec(), oh323_indicate(), oss_indicate(), phone_indicate(), queue_exec(), retrydial_exec(), say_periodic_announcement(), say_position(), sip_indicate(), and skinny_indicate().

04543 {
04544    if (ast_moh_start_ptr)
04545       return ast_moh_start_ptr(chan, mclass, interpclass);
04546 
04547    if (option_verbose > 2) {
04548       ast_verbose(VERBOSE_PREFIX_3 "Music class %s requested but no musiconhold loaded.\n", 
04549          mclass ? mclass : (interpclass ? interpclass : "default"));
04550    }
04551 
04552    return 0;
04553 }

void ast_moh_stop ( struct ast_channel chan  ) 

Turn off music on hold on a given channel.

Turn off music on hold on a given channel

Definition at line 4556 of file channel.c.

References ast_moh_stop_ptr.

Referenced by alsa_indicate(), app_exec(), ast_quiet_chan(), cb_events(), conf_run(), dahdi_indicate(), feature_exec_app(), gtalk_indicate(), handle_setmusic(), iax2_indicate(), local_indicate(), mgcp_indicate(), misdn_indication(), misdn_transfer_bc(), moh0_exec(), moh1_exec(), moh4_exec(), oh323_indicate(), oss_indicate(), phone_indicate(), queue_exec(), retrydial_exec(), say_periodic_announcement(), say_position(), sip_indicate(), skinny_indicate(), and try_calling().

04557 {
04558    if (ast_moh_stop_ptr)
04559       ast_moh_stop_ptr(chan);
04560 }

char* ast_print_group ( char *  buf,
int  buflen,
ast_group_t  group 
)

print call- and pickup groups into buffer

Definition at line 4574 of file channel.c.

References first.

Referenced by _sip_show_peer(), func_channel_read(), misdn_cfg_get_config_string(), print_group(), read_config(), and serialize_showchan().

04575 {
04576    unsigned int i;
04577    int first=1;
04578    char num[3];
04579 
04580    buf[0] = '\0';
04581    
04582    if (!group) /* Return empty string if no group */
04583       return buf;
04584 
04585    for (i = 0; i <= 63; i++) {   /* Max group is 63 */
04586       if (group & ((ast_group_t) 1 << i)) {
04587             if (!first) {
04588             strncat(buf, ", ", buflen - strlen(buf) - 1);
04589          } else {
04590             first=0;
04591          }
04592          snprintf(num, sizeof(num), "%u", i);
04593          strncat(buf, num, buflen - strlen(buf) - 1);
04594       }
04595    }
04596    return buf;
04597 }

int ast_prod ( struct ast_channel chan  ) 

Send empty audio to prime a channel driver.

Definition at line 2694 of file channel.c.

References ast_channel::_state, AST_FRAME_VOICE, AST_FRIENDLY_OFFSET, ast_log(), AST_STATE_UP, ast_write(), ast_frame::data, LOG_DEBUG, ast_channel::name, option_debug, ast_channel::rawwriteformat, ast_frame::src, and ast_frame::subclass.

Referenced by ast_activate_generator().

02695 {
02696    struct ast_frame a = { AST_FRAME_VOICE };
02697    char nothing[128];
02698 
02699    /* Send an empty audio frame to get things moving */
02700    if (chan->_state != AST_STATE_UP) {
02701       if (option_debug)
02702          ast_log(LOG_DEBUG, "Prodding channel '%s'\n", chan->name);
02703       a.subclass = chan->rawwriteformat;
02704       a.data = nothing + AST_FRIENDLY_OFFSET;
02705       a.src = "ast_prod";
02706       if (ast_write(chan, &a))
02707          ast_log(LOG_WARNING, "Prodding channel '%s' failed\n", chan->name);
02708    }
02709    return 0;
02710 }

int ast_queue_control ( struct ast_channel chan,
enum ast_control_frame_type  control 
)

Queue a control frame with payload.

Parameters:
chan channel to queue frame onto
control type of control frame
Returns:
zero on success, non-zero on failure

Definition at line 984 of file channel.c.

References AST_FRAME_CONTROL, ast_queue_frame(), and f.

Referenced by __dahdi_exception(), __oh323_update_info(), ast_pickup_call(), attempt_transfer(), auto_congest(), cb_events(), dahdi_handle_event(), dahdi_hangup(), gtalk_is_answered(), gtalk_ringing_ack(), handle_hd_hf(), handle_offhook_message(), handle_request(), handle_request_bye(), handle_request_info(), handle_request_invite(), handle_request_refer(), handle_response(), handle_response_invite(), handle_response_refer(), handle_soft_key_event_message(), handle_stimulus_message(), mgcp_call(), nbs_call(), phone_call(), pickup_do(), process_sdp(), receive_digit(), send_cause2ast(), setup_rtp_connection(), skinny_call(), skinny_unhold(), ss_thread(), and update_state().

00985 {
00986    struct ast_frame f = { AST_FRAME_CONTROL, };
00987 
00988    f.subclass = control;
00989 
00990    return ast_queue_frame(chan, &f);
00991 }

int ast_queue_control_data ( struct ast_channel chan,
enum ast_control_frame_type  control,
const void *  data,
size_t  datalen 
)

Queue a control frame with payload.

Parameters:
chan channel to queue frame onto
control type of control frame
data pointer to payload data to be included in frame
datalen number of bytes of payload data
Returns:
zero on success, non-zero on failure
The supplied payload data is copied into the frame, so the caller's copy is not modified nor freed, and the resulting frame will retain a copy of the data even if the caller frees their local copy.

Note:
This method should be treated as a 'network transport'; in other words, your frames may be transferred across an IAX2 channel to another system, which may be a different endianness than yours. Because of this, you should ensure that either your frames will never be expected to work across systems, or that you always put your payload data into 'network byte order' before calling this function.

Definition at line 994 of file channel.c.

References AST_FRAME_CONTROL, ast_queue_frame(), and f.

Referenced by action_atxfer(), dahdi_handle_event(), dahdi_hangup(), iax2_queue_control_data(), process_sdp(), and skinny_hold().

00996 {
00997    struct ast_frame f = { AST_FRAME_CONTROL, };
00998 
00999    f.subclass = control;
01000    f.data = (void *) data;
01001    f.datalen = datalen;
01002 
01003    return ast_queue_frame(chan, &f);
01004 }

int ast_queue_frame ( struct ast_channel chan,
struct ast_frame fin 
)

Queue an outgoing frame.

Definition at line 961 of file channel.c.

References __ast_queue_frame().

Referenced by __oh323_rtp_create(), __oh323_update_info(), agent_new(), alsa_call(), ast_channel_masquerade(), ast_channel_setwhentohangup(), ast_do_masquerade(), ast_dsp_process(), ast_queue_control(), ast_queue_control_data(), ast_queue_hangup(), ast_softhangup_nolock(), cb_events(), console_answer(), console_answer_deprecated(), console_dial(), console_dial_deprecated(), console_flash(), console_flash_deprecated(), console_sendtext(), console_sendtext_deprecated(), dahdi_queue_frame(), dictate_exec(), do_immediate_setup(), gtalk_handle_dtmf(), handle_keypad_button_message(), handle_request_info(), handle_request_invite(), handle_response_invite(), iax2_queue_frame(), local_queue_frame(), mgcp_queue_frame(), oh323_simulate_dtmf_end(), oss_call(), process_sdp(), queue_dtmf_readq(), receive_digit(), receive_message(), rpt_call(), and wakeup_sub().

00962 {
00963    return __ast_queue_frame(chan, fin, 0);
00964 }

int ast_queue_frame_head ( struct ast_channel chan,
struct ast_frame f 
)

Queue an outgoing frame to the head of the frame queue.

Parameters:
chan the channel to queue the frame on
f the frame to queue. Note that this frame will be duplicated by this function. It is the responsibility of the caller to handle freeing the memory associated with the frame being passed if necessary.
Return values:
0 success
non-zero failure

Definition at line 966 of file channel.c.

References __ast_queue_frame().

Referenced by ast_autoservice_stop().

00967 {
00968    return __ast_queue_frame(chan, fin, 1);
00969 }

int ast_queue_hangup ( struct ast_channel chan  ) 

Queue a hangup frame.

Definition at line 972 of file channel.c.

References ast_channel::_softhangup, ast_channel_trylock, ast_channel_unlock, AST_CONTROL_HANGUP, AST_FRAME_CONTROL, ast_queue_frame(), AST_SOFTHANGUP_DEV, and f.

Referenced by __oh323_update_info(), __sip_autodestruct(), cleanup_connection(), console_hangup(), console_hangup_deprecated(), dahdi_handle_event(), gtalk_hangup_farend(), gtalk_is_answered(), handle_onhook_message(), handle_request_bye(), handle_request_cancel(), handle_response(), handle_response_invite(), handle_soft_key_event_message(), hangup_chan(), hangup_connection(), iax2_destroy(), iax2_queue_hangup(), local_hangup(), mgcp_queue_hangup(), misdn_answer(), pri_hangup_all(), and retrans_pkt().

00973 {
00974    struct ast_frame f = { AST_FRAME_CONTROL, AST_CONTROL_HANGUP };
00975    /* Yeah, let's not change a lock-critical value without locking */
00976    if (!ast_channel_trylock(chan)) {
00977       chan->_softhangup |= AST_SOFTHANGUP_DEV;
00978       ast_channel_unlock(chan);
00979    }
00980    return ast_queue_frame(chan, &f);
00981 }

struct ast_frame* ast_read ( struct ast_channel chan  ) 

Reads a frame.

Parameters:
chan channel to read a frame from Read a frame.
Returns:
Returns a frame, or NULL on error. If it returns NULL, you best just stop reading frames and assume the channel has been disconnected.

Definition at line 2432 of file channel.c.

References __ast_read().

Referenced by __adsi_transmit_messages(), __ast_play_and_record(), __ast_request_and_dial(), adsi_careful_send(), agent_ack_sleep(), agent_read(), app_exec(), ast_feature_request_and_dial(), ast_recvtext(), ast_safe_sleep_conditional(), ast_tonepair(), ast_udptl_bridge(), ast_waitfordigit_full(), async_wait(), autoservice_run(), background_detect_exec(), bridge_native_loop(), bridge_p2p_loop(), channel_spy(), check_goto_on_transfer(), conf_exec(), conf_flush(), conf_run(), dahdi_bridge(), dictate_exec(), disa_exec(), do_atxfer(), do_idle_thread(), do_parking_thread(), do_waiting(), echo_exec(), features_read(), find_cache(), handle_invite_replaces(), handle_recordfile(), iax_park_thread(), ices_exec(), isAnsweringMachine(), masq_park_call(), measurenoise(), misdn_bridge(), monitor_dial(), mp3_exec(), NBScat_exec(), receive_dtmf_digits(), recordthread(), rpt(), run_agi(), send_tone_burst(), send_waveform_to_channel(), sendurl_exec(), speech_background(), ss_thread(), wait_for_answer(), wait_for_hangup(), wait_for_winner(), waitforring_exec(), and waitstream_core().

02433 {
02434    return __ast_read(chan, 0);
02435 }

static void ast_read_generator_actions ( struct ast_channel chan,
struct ast_frame f 
) [static]

Definition at line 1932 of file channel.c.

References ast_channel_lock, ast_channel_unlock, ast_deactivate_generator(), ast_format_rate(), AST_FRAME_CNG, ast_internal_timing_enabled(), ast_log(), ast_settimeout(), f, ast_generator::generate, ast_channel::generator, generator_force(), ast_channel::generatordata, LOG_DEBUG, option_debug, ast_channel::timingfd, ast_channel::timingfunc, and ast_channel::writeformat.

Referenced by __ast_read().

01933 {
01934    if (chan->generatordata &&  !ast_internal_timing_enabled(chan)) {
01935       void *tmp = chan->generatordata;
01936       int (*generate)(struct ast_channel *chan, void *tmp, int datalen, int samples) = NULL;
01937       int res;
01938       int samples;
01939 
01940       if (chan->timingfunc) {
01941          if (option_debug > 1)
01942             ast_log(LOG_DEBUG, "Generator got voice, switching to phase locked mode\n");
01943          ast_settimeout(chan, 0, NULL, NULL);
01944       }
01945 
01946       chan->generatordata = NULL;     /* reset, to let writes go through */
01947 
01948       if (f->subclass != chan->writeformat) {
01949          float factor;
01950          factor = ((float) ast_format_rate(chan->writeformat)) / ((float) ast_format_rate(f->subclass));
01951          samples = (int) ( ((float) f->samples) * factor );
01952       } else {
01953          samples = f->samples;
01954       }
01955 
01956       if (chan->generator->generate) {
01957          generate = chan->generator->generate;
01958       }
01959       /* This unlock is here based on two assumptions that hold true at this point in the
01960        * code. 1) this function is only called from within __ast_read() and 2) all generators
01961        * call ast_write() in their generate callback.
01962        *
01963        * The reason this is added is so that when ast_write is called, the lock that occurs 
01964        * there will not recursively lock the channel. Doing this will cause intended deadlock 
01965        * avoidance not to work in deeper functions
01966        */
01967       ast_channel_unlock(chan);
01968       res = generate(chan, tmp, f->datalen, samples);
01969       ast_channel_lock(chan);
01970       chan->generatordata = tmp;
01971       if (res) {
01972          if (option_debug > 1)
01973             ast_log(LOG_DEBUG, "Auto-deactivating generator\n");
01974          ast_deactivate_generator(chan);
01975       }
01976 
01977    } else if (f->frametype == AST_FRAME_CNG) {
01978       if (chan->generator && !chan->timingfunc && (chan->timingfd > -1)) {
01979          if (option_debug > 1)
01980             ast_log(LOG_DEBUG, "Generator got CNG, switching to timed mode\n");
01981          ast_settimeout(chan, 160, generator_force, chan);
01982       }
01983    }
01984 }

struct ast_frame* ast_read_noaudio ( struct ast_channel chan  ) 

Reads a frame, returning AST_FRAME_NULL frame if audio. Read a frame.

Parameters:
chan channel to read a frame from
Returns:
Returns a frame, or NULL on error. If it returns NULL, you best just stop reading frames and assume the channel has been disconnected.
Note:
Audio is replaced with AST_FRAME_NULL to avoid transcode when the resulting audio is not necessary.

Definition at line 2437 of file channel.c.

References __ast_read().

Referenced by conf_run().

02438 {
02439    return __ast_read(chan, 1);
02440 }

int ast_readstring ( struct ast_channel c,
char *  s,
int  len,
int  timeout,
int  rtimeout,
char *  enders 
)

Reads multiple digits

Parameters:
c channel to read from
s string to read in to. Must be at least the size of your length
len how many digits to read (maximum)
timeout how long to timeout between digits
rtimeout timeout to wait on the first digit
enders digits to end the string Read in a digit string "s", max length "len", maximum timeout between digits "timeout" (-1 for none), terminated by anything in "enders". Give them rtimeout for the first digit. Returns 0 on normal return, or 1 on a timeout. In the case of a timeout, any digits that were read before the timeout will still be available in s. RETURNS 2 in full version when ctrlfd is available, NOT 1

Definition at line 3219 of file channel.c.

References ast_readstring_full().

Referenced by __adsi_transmit_messages(), ast_adsi_begin_download(), ast_adsi_get_cpeinfo(), ast_adsi_load_session(), ast_app_getdata(), dialout(), do_directory(), forward_message(), privacy_exec(), vm_authenticate(), vm_newuser(), and vm_options().

03220 {
03221    return ast_readstring_full(c, s, len, timeout, ftimeout, enders, -1, -1);
03222 }

int ast_readstring_full ( struct ast_channel c,
char *  s,
int  len,
int  timeout,
int  ftimeout,
char *  enders,
int  audiofd,
int  ctrlfd 
)

Definition at line 3224 of file channel.c.

References ast_check_hangup(), AST_DIGIT_ANY, AST_FLAG_ZOMBIE, ast_stopstream(), ast_test_flag, ast_waitfordigit_full(), ast_waitstream_full(), and ast_channel::stream.

Referenced by ast_app_getdata_full(), and ast_readstring().

03225 {
03226    int pos = 0;   /* index in the buffer where we accumulate digits */
03227    int to = ftimeout;
03228 
03229    /* Stop if we're a zombie or need a soft hangup */
03230    if (ast_test_flag(c, AST_FLAG_ZOMBIE) || ast_check_hangup(c))
03231       return -1;
03232    if (!len)
03233       return -1;
03234    for (;;) {
03235       int d;
03236       if (c->stream) {
03237          d = ast_waitstream_full(c, AST_DIGIT_ANY, audiofd, ctrlfd);
03238          ast_stopstream(c);
03239          usleep(1000);
03240          if (!d)
03241             d = ast_waitfordigit_full(c, to, audiofd, ctrlfd);
03242       } else {
03243          d = ast_waitfordigit_full(c, to, audiofd, ctrlfd);
03244       }
03245       if (d < 0)
03246          return -1;
03247       if (d == 0) {
03248          s[pos]='\0';
03249          return 1;
03250       }
03251       if (d == 1) {
03252          s[pos]='\0';
03253          return 2;
03254       }
03255       if (!strchr(enders, d))
03256          s[pos++] = d;
03257       if (strchr(enders, d) || (pos >= len)) {
03258          s[pos]='\0';
03259          return 0;
03260       }
03261       to = timeout;
03262    }
03263    /* Never reached */
03264    return 0;
03265 }

int ast_recvchar ( struct ast_channel chan,
int  timeout 
)

Receives a text character from a channel.

Parameters:
chan channel to act upon
timeout timeout in milliseconds (0 for infinite wait) Read a char of text from a channel Returns 0 on success, -1 on failure

Definition at line 2574 of file channel.c.

References ast_recvtext(), and free.

Referenced by handle_recvchar().

02575 {
02576    int c;
02577    char *buf = ast_recvtext(chan, timeout);
02578    if (buf == NULL)
02579       return -1;  /* error or timeout */
02580    c = *(unsigned char *)buf;
02581    free(buf);
02582    return c;
02583 }

char* ast_recvtext ( struct ast_channel chan,
int  timeout 
)

Receives a text string from a channel Read a string of text from a channel.

Parameters:
chan channel to act upon
timeout timeout in milliseconds (0 for infinite wait)
Returns:
the received text, or NULL to signify failure.

Definition at line 2585 of file channel.c.

References ast_check_hangup(), AST_CONTROL_HANGUP, AST_FRAME_CONTROL, AST_FRAME_TEXT, ast_frfree, ast_read(), ast_strndup, ast_waitfor(), and f.

Referenced by ast_recvchar(), and handle_recvtext().

02586 {
02587    int res, done = 0;
02588    char *buf = NULL;
02589    
02590    while (!done) {
02591       struct ast_frame *f;
02592       if (ast_check_hangup(chan))
02593          break;
02594       res = ast_waitfor(chan, timeout);
02595       if (res <= 0) /* timeout or error */
02596          break;
02597       timeout = res; /* update timeout */
02598       f = ast_read(chan);
02599       if (f == NULL)
02600          break; /* no frame */
02601       if (f->frametype == AST_FRAME_CONTROL && f->subclass == AST_CONTROL_HANGUP)
02602          done = 1;   /* force a break */
02603       else if (f->frametype == AST_FRAME_TEXT) {      /* what we want */
02604          buf = ast_strndup((char *) f->data, f->datalen);   /* dup and break */
02605          done = 1;
02606       }
02607       ast_frfree(f);
02608    }
02609    return buf;
02610 }

struct ast_channel* ast_request ( const char *  type,
int  format,
void *  data,
int *  status 
)

Requests a channel.

Parameters:
type type of channel to request
format requested channel format (codec)
data data to pass to the channel requester
status status Request a channel of a given type, with data as optional information used by the low level module
Returns:
Returns an ast_channel on success, NULL on failure.

Definition at line 3125 of file channel.c.

References AST_CAUSE_BEARERCAPABILITY_NOTAVAIL, AST_CAUSE_NOSUCHDRIVER, AST_CAUSE_NOTDEFINED, AST_FORMAT_AUDIO_MASK, AST_FORMAT_VIDEO_MASK, AST_LIST_LOCK, AST_LIST_TRAVERSE, AST_LIST_UNLOCK, ast_log(), ast_translator_best_choice(), capabilities, ast_channel_tech::capabilities, ast_channel_tech::requester, chanlist::tech, and ast_channel_tech::type.

Referenced by __ast_request_and_dial(), agent_request(), ast_feature_request_and_dial(), attempt_reconnect(), begin_dial(), build_conf(), chanavail_exec(), conf_run(), connect_link(), features_alloc(), findmeexec(), ring_entry(), rpt(), rpt_call(), rpt_tele_thread(), and wait_for_answer().

03126 {
03127    struct chanlist *chan;
03128    struct ast_channel *c;
03129    int capabilities;
03130    int fmt;
03131    int res;
03132    int foo;
03133    int videoformat = format & AST_FORMAT_VIDEO_MASK;
03134 
03135    if (!cause)
03136       cause = &foo;
03137    *cause = AST_CAUSE_NOTDEFINED;
03138 
03139    if (AST_LIST_LOCK(&channels)) {
03140       ast_log(LOG_WARNING, "Unable to lock channel list\n");
03141       return NULL;
03142    }
03143 
03144    AST_LIST_TRAVERSE(&backends, chan, list) {
03145       if (strcasecmp(type, chan->tech->type))
03146          continue;
03147 
03148       capabilities = chan->tech->capabilities;
03149       fmt = format & AST_FORMAT_AUDIO_MASK;
03150       res = ast_translator_best_choice(&fmt, &capabilities);
03151       if (res < 0) {
03152          ast_log(LOG_WARNING, "No translator path exists for channel type %s (native %d) to %d\n", type, chan->tech->capabilities, format);
03153          *cause = AST_CAUSE_BEARERCAPABILITY_NOTAVAIL;
03154          AST_LIST_UNLOCK(&channels);
03155          return NULL;
03156       }
03157       AST_LIST_UNLOCK(&channels);
03158       if (!chan->tech->requester)
03159          return NULL;
03160       
03161       if (!(c = chan->tech->requester(type, capabilities | videoformat, data, cause)))
03162          return NULL;
03163 
03164       /* no need to generate a Newchannel event here; it is done in the channel_alloc call */
03165       return c;
03166    }
03167 
03168    ast_log(LOG_WARNING, "No channel type registered for '%s'\n", type);
03169    *cause = AST_CAUSE_NOSUCHDRIVER;
03170    AST_LIST_UNLOCK(&channels);
03171 
03172    return NULL;
03173 }

struct ast_channel* ast_request_and_dial ( const char *  type,
int  format,
void *  data,
int  timeout,
int *  reason,
const char *  cidnum,
const char *  cidname 
)

Request a channel of a given type, with data as optional information used by the low level module and attempt to place a call on it.

Parameters:
type type of channel to request
format requested channel format
data data to pass to the channel requester
timeout maximum amount of time to wait for an answer
reason why unsuccessful (if unsuceessful)
cidnum Caller-ID Number
cidname Caller-ID Name
Returns:
Returns an ast_channel on success or no answer, NULL on failure. Check the value of chan->_state to know if the call was answered or not.

Definition at line 3120 of file channel.c.

References __ast_request_and_dial().

Referenced by ast_pbx_outgoing_exten().

03121 {
03122    return __ast_request_and_dial(type, format, data, timeout, outstate, cidnum, cidname, NULL);
03123 }

int ast_safe_sleep ( struct ast_channel chan,
int  ms 
)

Wait for a specied amount of time, looking for hangups.

Parameters:
chan channel to wait for
ms length of time in milliseconds to sleep Waits for a specified amount of time, servicing the channel as required.
Returns:
returns -1 on hangup, otherwise 0.

Definition at line 1194 of file channel.c.

References ast_safe_sleep_conditional().

Referenced by __login_exec(), alarmreceiver_exec(), ast_adsi_transmit_message_full(), ast_dtmf_stream(), ast_senddigit(), builtin_parkcall(), conf_run(), dictate_exec(), flash_exec(), function_ilink(), mgcp_ss(), milliwatt_exec(), moh0_exec(), moh1_exec(), old_milliwatt_exec(), park_call_exec(), pbx_builtin_answer(), pbx_builtin_wait(), play_tone_pair(), playtone(), privacy_exec(), receive_ademco_contact_id(), rpt_call(), rpt_exec(), rpt_tele_thread(), send_morse(), send_tone_telemetry(), skinny_ss(), ss_thread(), testclient_exec(), testserver_exec(), try_calling(), wait_for_hangup(), wait_interval(), and zapateller_exec().

01195 {
01196    return ast_safe_sleep_conditional(chan, ms, NULL, NULL);
01197 }

int ast_safe_sleep_conditional ( struct ast_channel chan,
int  ms,
int(*)(void *)  cond,
void *  data 
)

Wait for a specied amount of time, looking for hangups and a condition argument.

Parameters:
chan channel to wait for
ms length of time in milliseconds to sleep
cond a function pointer for testing continue condition
data argument to be passed to the condition test function
Returns:
returns -1 on hangup, otherwise 0. Waits for a specified amount of time, servicing the channel as required. If cond returns 0, this function returns.

Definition at line 1173 of file channel.c.

References ast_frfree, ast_read(), ast_waitfor(), and f.

Referenced by __login_exec(), and ast_safe_sleep().

01174 {
01175    struct ast_frame *f;
01176 
01177    while (ms > 0) {
01178       if (cond && ((*cond)(data) == 0))
01179          return 0;
01180       ms = ast_waitfor(chan, ms);
01181       if (ms < 0)
01182          return -1;
01183       if (ms > 0) {
01184          f = ast_read(chan);
01185          if (!f)
01186             return -1;
01187          ast_frfree(f);
01188       }
01189    }
01190    return 0;
01191 }

char* ast_safe_string_alloc ( const char *  fmt,
  ... 
)

printf the string into a correctly sized mallocd buffer, and return the buffer

return a mallocd string with the result of sprintf of the fmt and following args

Definition at line 409 of file channel.c.

References ast_malloc, and len().

Referenced by dahdi_new(), and features_new().

00410 {
00411    char *b2, buf[1];
00412    int len;
00413    va_list args;
00414 
00415    va_start(args, fmt);
00416    len = vsnprintf(buf, 1, fmt, args);
00417    va_end(args);
00418 
00419    if (!(b2 = ast_malloc(len + 1)))
00420       return NULL;
00421 
00422    va_start(args, fmt);
00423    vsnprintf(b2, len + 1,  fmt, args);
00424    va_end(args);
00425 
00426    return b2;
00427 }

int ast_say_character_str ( struct ast_channel chan,
const char *  str,
const char *  ints,
const char *  lang 
)

Definition at line 4856 of file channel.c.

References ast_say_character_str_full.

Referenced by common_exec(), pbx_builtin_saycharacters(), play_mailbox_owner(), rpt_tele_thread(), and saycharstr().

04858 {
04859         return ast_say_character_str_full(chan, str, ints, lang, -1, -1);
04860 }

int ast_say_digit_str ( struct ast_channel chan,
const char *  str,
const char *  ints,
const char *  lang 
)

Definition at line 4850 of file channel.c.

References ast_say_digit_str_full.

Referenced by invent_message(), mgcp_ss(), pbx_builtin_saydigits(), play_message_callerid(), and ss_thread().

04852 {
04853         return ast_say_digit_str_full(chan, str, ints, lang, -1, -1);
04854 }

int ast_say_digits ( struct ast_channel chan,
int  num,
const char *  ints,
const char *  lang 
)

Definition at line 4844 of file channel.c.

References ast_say_digits_full().

Referenced by common_exec(), conf_exec(), park_call_full(), parkandannounce_exec(), and rpt_tele_thread().

04846 {
04847         return ast_say_digits_full(chan, num, ints, lang, -1, -1);
04848 }

int ast_say_digits_full ( struct ast_channel chan,
int  num,
const char *  ints,
const char *  lang,
int  audiofd,
int  ctrlfd 
)

Definition at line 4868 of file channel.c.

References ast_say_digit_str_full.

Referenced by __say_init(), ast_say_digits(), ast_say_enumeration_full_da(), ast_say_enumeration_full_de(), ast_say_number_full_cz(), ast_say_number_full_da(), ast_say_number_full_de(), ast_say_number_full_en(), ast_say_number_full_en_GB(), ast_say_number_full_es(), ast_say_number_full_fr(), ast_say_number_full_ge(), ast_say_number_full_he(), ast_say_number_full_it(), ast_say_number_full_nl(), ast_say_number_full_no(), ast_say_number_full_pt(), ast_say_number_full_ru(), ast_say_number_full_se(), and ast_say_number_full_tw().

04870 {
04871         char buf[256];
04872 
04873         snprintf(buf, sizeof(buf), "%d", num);
04874         return ast_say_digit_str_full(chan, buf, ints, lang, audiofd, ctrlfd);
04875 }

int ast_say_enumeration ( struct ast_channel chan,
int  num,
const char *  ints,
const char *  language,
const char *  options 
)

Definition at line 4838 of file channel.c.

References ast_say_enumeration_full.

Referenced by ast_say_date_da(), ast_say_date_de(), ast_say_date_with_format_da(), ast_say_date_with_format_de(), ast_say_date_with_format_en(), and ast_say_date_with_format_pl().

04840 {
04841         return ast_say_enumeration_full(chan, num, ints, language, options, -1, -1);
04842 }

int ast_say_number ( struct ast_channel chan,
int  num,
const char *  ints,
const char *  language,
const char *  options 
)

Definition at line 4832 of file channel.c.

References ast_say_number_full.

Referenced by ast_say_date_da(), ast_say_date_de(), ast_say_date_en(), ast_say_date_es(), ast_say_date_fr(), ast_say_date_ge(), ast_say_date_gr(), ast_say_date_he(), ast_say_date_nl(), ast_say_date_pt(), ast_say_date_with_format_da(), ast_say_date_with_format_de(), ast_say_date_with_format_en(), ast_say_date_with_format_es(), ast_say_date_with_format_fr(), ast_say_date_with_format_it(), ast_say_date_with_format_nl(), ast_say_date_with_format_pl(), ast_say_date_with_format_pt(), ast_say_datetime_en(), ast_say_datetime_fr(), ast_say_datetime_from_now_en(), ast_say_datetime_from_now_fr(), ast_say_datetime_from_now_ge(), ast_say_datetime_from_now_he(), ast_say_datetime_from_now_pt(), ast_say_datetime_he(), ast_say_datetime_pt(), ast_say_datetime_tw(), ast_say_time_de(), ast_say_time_en(), ast_say_time_es(), ast_say_time_fr(), ast_say_time_ge(), ast_say_time_gr(), ast_say_time_nl(), ast_say_time_pt(), ast_say_time_pt_BR(), ast_say_time_tw(), bridge_playfile(), conf_exec(), conf_run(), count_exec(), dictate_exec(), get_folder(), gr_say_number_female(), pbx_builtin_saynumber(), play_message(), play_message_duration(), rpt_tele_thread(), say_and_wait(), say_position(), saynum(), try_calling(), vm_intro_gr(), vm_intro_he(), vm_intro_pt(), and vm_intro_pt_BR().

04834 {
04835         return ast_say_number_full(chan, num, ints, language, options, -1, -1);
04836 }

int ast_say_phonetic_str ( struct ast_channel chan,
const char *  str,
const char *  ints,
const char *  lang 
)

Definition at line 4862 of file channel.c.

References ast_say_phonetic_str_full.

Referenced by pbx_builtin_sayphonetic().

04864 {
04865         return ast_say_phonetic_str_full(chan, str, ints, lang, -1, -1);
04866 }

int ast_senddigit ( struct ast_channel chan,
char  digit 
)

Send a DTMF digit to a channel Send a DTMF digit to a channel.

Parameters:
chan channel to act upon
digit the DTMF digit to send, encoded in ASCII
Returns:
Returns 0 on success, -1 on failure

Definition at line 2684 of file channel.c.

References AST_DEFAULT_EMULATE_DTMF_DURATION, ast_safe_sleep(), ast_senddigit_begin(), ast_senddigit_end(), ast_channel_tech::send_digit_begin, and ast_channel::tech.

Referenced by ast_dtmf_stream(), do_dtmf_phone(), manager_play_dtmf(), and rpt_call().

02685 {
02686    if (chan->tech->send_digit_begin) {
02687       ast_senddigit_begin(chan, digit);
02688       ast_safe_sleep(chan, AST_DEFAULT_EMULATE_DTMF_DURATION);
02689    }
02690    
02691    return ast_senddigit_end(chan, digit, AST_DEFAULT_EMULATE_DTMF_DURATION);
02692 }

int ast_senddigit_begin ( struct ast_channel chan,
char  digit 
)

Definition at line 2625 of file channel.c.

References ast_log(), ast_playtones_start(), LOG_DEBUG, ast_channel::name, option_debug, ast_channel_tech::send_digit_begin, and ast_channel::tech.

Referenced by agent_digit_begin(), ast_senddigit(), ast_write(), and features_digit_begin().

02626 {
02627    /* Device does not support DTMF tones, lets fake
02628     * it by doing our own generation. */
02629    static const char* dtmf_tones[] = {
02630       "941+1336", /* 0 */
02631       "697+1209", /* 1 */
02632       "697+1336", /* 2 */
02633       "697+1477", /* 3 */
02634       "770+1209", /* 4 */
02635       "770+1336", /* 5 */
02636       "770+1477", /* 6 */
02637       "852+1209", /* 7 */
02638       "852+1336", /* 8 */
02639       "852+1477", /* 9 */
02640       "697+1633", /* A */
02641       "770+1633", /* B */
02642       "852+1633", /* C */
02643       "941+1633", /* D */
02644       "941+1209", /* * */
02645       "941+1477"  /* # */
02646    };
02647 
02648    if (!chan->tech->send_digit_begin)
02649       return 0;
02650 
02651    if (!chan->tech->send_digit_begin(chan, digit))
02652       return 0;
02653 
02654    if (digit >= '0' && digit <='9')
02655       ast_playtones_start(chan, 0, dtmf_tones[digit-'0'], 0);
02656    else if (digit >= 'A' && digit <= 'D')
02657       ast_playtones_start(chan, 0, dtmf_tones[digit-'A'+10], 0);
02658    else if (digit == '*')
02659       ast_playtones_start(chan, 0, dtmf_tones[14], 0);
02660    else if (digit == '#')
02661       ast_playtones_start(chan, 0, dtmf_tones[15], 0);
02662    else {
02663       /* not handled */
02664       if (option_debug)
02665          ast_log(LOG_DEBUG, "Unable to generate DTMF tone '%c' for '%s'\n", digit, chan->name);
02666    }
02667 
02668    return 0;
02669 }

int ast_senddigit_end ( struct ast_channel chan,
char  digit,
unsigned int  duration 
)

Definition at line 2671 of file channel.c.

References ast_playtones_stop(), ast_channel::generator, ast_channel_tech::send_digit_end, and ast_channel::tech.

Referenced by agent_digit_end(), ast_senddigit(), ast_write(), and features_digit_end().

02672 {
02673    int res = -1;
02674 
02675    if (chan->tech->send_digit_end)
02676       res = chan->tech->send_digit_end(chan, digit, duration);
02677 
02678    if (res && chan->generator)
02679       ast_playtones_stop(chan);
02680    
02681    return 0;
02682 }

int ast_sendtext ( struct ast_channel chan,
const char *  text 
)

Sends text to a channel Write text to a display on a channel.

Parameters:
chan channel to act upon
text string of text to send on the channel
Returns:
Returns 0 on success, -1 on failure

Definition at line 2612 of file channel.c.

References ast_check_hangup(), ast_clear_flag, AST_FLAG_BLOCKING, AST_FLAG_ZOMBIE, ast_test_flag, CHECK_BLOCKING, ast_channel_tech::send_text, and ast_channel::tech.

Referenced by agent_sendtext(), handle_sendtext(), and sendtext_exec().

02613 {
02614    int res = 0;
02615    /* Stop if we're a zombie or need a soft hangup */
02616    if (ast_test_flag(chan, AST_FLAG_ZOMBIE) || ast_check_hangup(chan))
02617       return -1;
02618    CHECK_BLOCKING(chan);
02619    if (chan->tech->send_text)
02620       res = chan->tech->send_text(chan, text);
02621    ast_clear_flag(chan, AST_FLAG_BLOCKING);
02622    return res;
02623 }

void ast_set_callerid ( struct ast_channel chan,
const char *  cidnum,
const char *  cidname,
const char *  ani 
)

Note:
The channel does not need to be locked before calling this function.

Definition at line 3779 of file channel.c.

References ast_channel_lock, ast_channel_unlock, ast_describe_caller_presentation(), ast_strdup, ast_channel::cid, ast_callerid::cid_ani, ast_callerid::cid_name, ast_callerid::cid_num, ast_callerid::cid_pres, free, manager_event(), ast_channel::name, S_OR, and ast_channel::uniqueid.

Referenced by __ast_request_and_dial(), agent_call(), ast_feature_request_and_dial(), callerid_write(), dahdi_read(), disa_exec(), findmeexec(), handle_setcallerid(), lookupcidname_exec(), mgcp_ss(), privacy_exec(), read_config(), setcallerid_exec(), skinny_newcall(), ss_thread(), and wait_for_answer().

03780 {
03781    ast_channel_lock(chan);
03782 
03783    if (callerid) {
03784       if (chan->cid.cid_num)
03785          free(chan->cid.cid_num);
03786       chan->cid.cid_num = ast_strdup(callerid);
03787    }
03788    if (calleridname) {
03789       if (chan->cid.cid_name)
03790          free(chan->cid.cid_name);
03791       chan->cid.cid_name = ast_strdup(calleridname);
03792    }
03793    if (ani) {
03794       if (chan->cid.cid_ani)
03795          free(chan->cid.cid_ani);
03796       chan->cid.cid_ani = ast_strdup(ani);
03797    }
03798    manager_event(EVENT_FLAG_CALL, "Newcallerid",
03799             "Channel: %s\r\n"
03800             "CallerID: %s\r\n"
03801             "CallerIDName: %s\r\n"
03802             "Uniqueid: %s\r\n"
03803             "CID-CallingPres: %d (%s)\r\n",
03804             chan->name,
03805             S_OR(chan->cid.cid_num, "<Unknown>"),
03806             S_OR(chan->cid.cid_name, "<Unknown>"),
03807             chan->uniqueid,
03808             chan->cid.cid_pres,
03809             ast_describe_caller_presentation(chan->cid.cid_pres)
03810             );
03811    
03812    ast_channel_unlock(chan);
03813 }

int ast_set_read_format ( struct ast_channel chan,
int  format 
)

Sets read format on channel chan Set read format for channel to whichever component of "format" is best.

Parameters:
chan channel to change
format format to change to
Returns:
Returns 0 on success, -1 on failure

Definition at line 2965 of file channel.c.

References ast_channel::rawreadformat, ast_channel::readformat, ast_channel::readtrans, and set_format().

Referenced by __ast_play_and_record(), __login_exec(), __oh323_update_info(), agent_call(), alarmreceiver_exec(), ast_adsi_transmit_message_full(), ast_channel_make_compatible(), ast_do_masquerade(), attempt_reconnect(), background_detect_exec(), build_conf(), conf_run(), connect_link(), dictate_exec(), disa_exec(), do_waiting(), eagi_exec(), echo_exec(), gtalk_rtp_read(), handle_recordfile(), ices_exec(), isAnsweringMachine(), measurenoise(), mgcp_rtp_read(), oh323_rtp_read(), old_milliwatt_exec(), process_sdp(), rpt(), setup_rtp_connection(), sip_rtp_read(), skinny_rtp_read(), socket_process(), speech_background(), and update_features().

02966 {
02967    return set_format(chan, fmt, &chan->rawreadformat, &chan->readformat,
02968            &chan->readtrans, 0);
02969 }

void ast_set_variables ( struct ast_channel chan,
struct ast_variable vars 
)

adds a list of channel variables to a channel

Parameters:
chan the channel
vars a linked list of variables
Variable names can be for a regular channel variable or a dialplan function that has the ability to be written to.

Definition at line 4599 of file channel.c.

References ast_variable::name, ast_variable::next, pbx_builtin_setvar_helper(), and ast_variable::value.

Referenced by __ast_request_and_dial(), ast_pbx_outgoing_app(), and ast_pbx_outgoing_exten().

04600 {
04601    struct ast_variable *cur;
04602 
04603    for (cur = vars; cur; cur = cur->next)
04604       pbx_builtin_setvar_helper(chan, cur->name, cur->value);  
04605 }

int ast_set_write_format ( struct ast_channel chan,
int  format 
)

Sets write format on channel chan Set write format for channel to whichever compoent of "format" is best.

Parameters:
chan channel to change
format new format for writing
Returns:
Returns 0 on success, -1 on failure

Definition at line 2971 of file channel.c.

References ast_channel::rawwriteformat, set_format(), ast_channel::writeformat, and ast_channel::writetrans.

Referenced by __login_exec(), __oh323_update_info(), agent_call(), alarmreceiver_exec(), ast_adsi_transmit_message_full(), ast_channel_make_compatible(), ast_channel_start_silence_generator(), ast_channel_stop_silence_generator(), ast_do_masquerade(), ast_openstream_full(), ast_stopstream(), attempt_reconnect(), build_conf(), chanspy_exec(), conf_run(), connect_link(), disa_exec(), echo_exec(), extenspy_exec(), gtalk_rtp_read(), linear_alloc(), linear_release(), mgcp_rtp_read(), moh_alloc(), moh_files_release(), moh_release(), mp3_exec(), NBScat_exec(), oh323_rtp_read(), old_milliwatt_exec(), playtones_alloc(), playtones_release(), process_sdp(), rpt(), send_waveform_to_channel(), setup_rtp_connection(), sip_rtp_read(), skinny_rtp_read(), socket_process(), tonepair_alloc(), tonepair_release(), and update_features().

02972 {
02973    return set_format(chan, fmt, &chan->rawwriteformat, &chan->writeformat,
02974            &chan->writetrans, 1);
02975 }

int ast_setstate ( struct ast_channel chan,
enum ast_channel_state  state 
)

Change the state of a channel.

Definition at line 3815 of file channel.c.

References ast_channel::_state, AST_CHANNEL_NAME, ast_copy_string(), ast_device_state_changed_literal(), ast_state2str(), ast_channel::cid, ast_callerid::cid_name, ast_callerid::cid_num, manager_event(), name, ast_channel::name, S_OR, and ast_channel::uniqueid.

Referenced by __ast_read(), __dahdi_exception(), __oh323_update_info(), agent_call(), alsa_answer(), ast_answer(), cb_events(), check_availability(), dahdi_answer(), dahdi_call(), dahdi_handle_event(), dahdi_indicate(), dahdi_read(), gtalk_call(), gtalk_newcall(), handle_invite_replaces(), handle_offhook_message(), handle_request_invite(), handle_response_invite(), handle_soft_key_event_message(), handle_stimulus_message(), iax2_call(), mgcp_answer(), mgcp_call(), mgcp_ss(), misdn_call(), misdn_indication(), nbs_call(), nbs_hangup(), oh323_answer(), oss_answer(), pbx_builtin_busy(), pbx_builtin_congestion(), phone_answer(), phone_call(), phone_exception(), phone_hangup(), phone_write(), release_chan(), sip_answer(), skinny_answer(), skinny_call(), skinny_newcall(), ss_thread(), and update_state().

03816 {
03817    char name[AST_CHANNEL_NAME], *dashptr;
03818    int oldstate = chan->_state;
03819 
03820    if (oldstate == state)
03821       return 0;
03822 
03823    ast_copy_string(name, chan->name, sizeof(name));
03824    if ((dashptr = strrchr(name, '-'))) {
03825       *dashptr = '\0';
03826    }
03827 
03828    chan->_state = state;
03829    ast_device_state_changed_literal(name);
03830    /* setstate used to conditionally report Newchannel; this is no more */
03831    manager_event(EVENT_FLAG_CALL,
03832             "Newstate",
03833             "Channel: %s\r\n"
03834             "State: %s\r\n"
03835             "CallerID: %s\r\n"
03836             "CallerIDName: %s\r\n"
03837             "Uniqueid: %s\r\n",
03838             chan->name, ast_state2str(chan->_state),
03839             S_OR(chan->cid.cid_num, "<unknown>"),
03840             S_OR(chan->cid.cid_name, "<unknown>"),
03841             chan->uniqueid);
03842 
03843    return 0;
03844 }

int ast_settimeout ( struct ast_channel c,
int  samples,
int(*)(const void *data)  func,
void *  data 
)

Definition at line 1837 of file channel.c.

References ast_log(), LOG_DEBUG, option_debug, ast_channel::timingdata, ast_channel::timingfd, and ast_channel::timingfunc.

Referenced by ast_activate_generator(), ast_deactivate_generator(), ast_read_generator_actions(), ast_readaudio_callback(), and filestream_destructor().

01838 {
01839    int res = -1;
01840 #ifdef HAVE_DAHDI
01841    if (c->timingfd > -1) {
01842       if (!func) {
01843          samples = 0;
01844          data = 0;
01845       }
01846       if (option_debug)
01847          ast_log(LOG_DEBUG, "Scheduling timer at %d sample intervals\n", samples);
01848       res = ioctl(c->timingfd, DAHDI_TIMERCONFIG, &samples);
01849       c->timingfunc = func;
01850       c->timingdata = data;
01851    }
01852 #endif   
01853    return res;
01854 }

int ast_shutting_down ( void   ) 

Returns non-zero if Asterisk is being shut down.

Returns non-zero if Asterisk is being shut down

Definition at line 461 of file channel.c.

Referenced by handle_request_options().

00462 {
00463    return shutting_down;
00464 }

int ast_softhangup ( struct ast_channel chan,
int  cause 
)

Softly hangup up a channel.

Parameters:
chan channel to be soft-hung-up Call the protocol layer, but don't destroy the channel structure (use this if you are trying to safely hangup a channel managed by another thread.
cause Ast hangupcause for hangup
Returns:
Returns 0 regardless

Definition at line 1437 of file channel.c.

References ast_channel_lock, ast_channel_unlock, and ast_softhangup_nolock().

Referenced by __ast_module_user_hangup_all(), __login_exec(), __unload_module(), action_hangup(), agent_hangup(), agent_logoff(), ast_begin_shutdown(), ast_dial_join(), conf_free(), connect_link(), dahdi_handle_event(), function_ilink(), handle_hangup(), handle_link_data(), handle_softhangup(), manager_park(), read_agent_config(), rpt(), rpt_call(), rpt_do_restart(), sla_handle_hold_event(), softhangup_exec(), start_spying(), startmon(), and unload_module().

01438 {
01439    int res;
01440    ast_channel_lock(chan);
01441    res = ast_softhangup_nolock(chan, cause);
01442    ast_channel_unlock(chan);
01443    return res;
01444 }

int ast_softhangup_nolock ( struct ast_channel chan,
int  cause 
)

Softly hangup up a channel (no channel lock).

Parameters:
chan channel to be soft-hung-up
cause Ast hangupcause for hangup (see cause.h)

Definition at line 1423 of file channel.c.

References ast_channel::_softhangup, AST_FLAG_BLOCKING, ast_log(), ast_null_frame, ast_queue_frame(), ast_test_flag, ast_channel::blocker, LOG_DEBUG, ast_channel::name, and option_debug.

Referenced by ast_async_goto(), ast_softhangup(), attempt_transfer(), dahdi_softhangup_all(), do_monitor(), oh323_indicate(), sip_indicate(), and skinny_indicate().

01424 {
01425    if (option_debug)
01426       ast_log(LOG_DEBUG, "Soft-Hanging up channel '%s'\n", chan->name);
01427    /* Inform channel driver that we need to be hung up, if it cares */
01428    chan->_softhangup |= cause;
01429    ast_queue_frame(chan, &ast_null_frame);
01430    /* Interrupt any poll call or such */
01431    if (ast_test_flag(chan, AST_FLAG_BLOCKING))
01432       pthread_kill(chan->blocker, SIGURG);
01433    return 0;
01434 }

char* ast_state2str ( enum  ast_channel_state  ) 

Gives the string form of a given channel state.

Parameters:
ast_channel_state state to get the name of Give a name to a state Returns the text form of the binary state given

Definition at line 600 of file channel.c.

References AST_STATE_BUSY, AST_STATE_DIALING, AST_STATE_DIALING_OFFHOOK, AST_STATE_DOWN, AST_STATE_OFFHOOK, AST_STATE_PRERING, AST_STATE_RESERVED, AST_STATE_RING, AST_STATE_RINGING, AST_STATE_UP, ast_threadstorage_get(), STATE2STR_BUFSIZE, and state2str_threadbuf.

Referenced by action_status(), agent_hangup(), ast_setstate(), attempt_transfer(), func_channel_read(), handle_chanlist(), handle_chanlist_deprecated(), handle_invite_replaces(), handle_showchan(), handle_showchan_deprecated(), local_attended_transfer(), mgcp_new(), serialize_showchan(), and sip_hangup().

00601 {
00602    char *buf;
00603 
00604    switch(state) {
00605    case AST_STATE_DOWN:
00606       return "Down";
00607    case AST_STATE_RESERVED:
00608       return "Rsrvd";
00609    case AST_STATE_OFFHOOK:
00610       return "OffHook";
00611    case AST_STATE_DIALING:
00612       return "Dialing";
00613    case AST_STATE_RING:
00614       return "Ring";
00615    case AST_STATE_RINGING:
00616       return "Ringing";
00617    case AST_STATE_UP:
00618       return "Up";
00619    case AST_STATE_BUSY:
00620       return "Busy";
00621    case AST_STATE_DIALING_OFFHOOK:
00622       return "Dialing Offhook";
00623    case AST_STATE_PRERING:
00624       return "Pre-ring";
00625    default:
00626       if (!(buf = ast_threadstorage_get(&state2str_threadbuf, STATE2STR_BUFSIZE)))
00627          return "Unknown";
00628       snprintf(buf, STATE2STR_BUFSIZE, "Unknown (%d)", state);
00629       return buf;
00630    }
00631 }

int ast_str2cause ( const char *  name  ) 

Convert a symbolic hangup cause to number.

Parameters:
name string form of the cause Returns the cause code

Definition at line 588 of file channel.c.

References causes.

Referenced by pbx_builtin_hangup().

00589 {
00590    int x;
00591 
00592    for (x = 0; x < sizeof(causes) / sizeof(causes[0]); x++)
00593       if (strncasecmp(causes[x].name, name, strlen(causes[x].name)) == 0)
00594          return causes[x].cause;
00595 
00596    return -1;
00597 }

int ast_tonepair ( struct ast_channel chan,
int  freq1,
int  freq2,
int  duration,
int  vol 
)

Play a tone pair for a given amount of time

Definition at line 4471 of file channel.c.

References ast_frfree, ast_read(), ast_tonepair_start(), ast_waitfor(), f, and ast_channel::generatordata.

Referenced by zapateller_exec().

04472 {
04473    int res;
04474 
04475    if ((res = ast_tonepair_start(chan, freq1, freq2, duration, vol)))
04476       return res;
04477 
04478    /* Give us some wiggle room */
04479    while (chan->generatordata && ast_waitfor(chan, 100) >= 0) {
04480       struct ast_frame *f = ast_read(chan);
04481       if (f)
04482          ast_frfree(f);
04483       else
04484          return -1;
04485    }
04486    return 0;
04487 }

int ast_tonepair_start ( struct ast_channel chan,
int  freq1,
int  freq2,
int  duration,
int  vol 
)

Start a tone going

Definition at line 4453 of file channel.c.

References ast_activate_generator(), tonepair_def::duration, tonepair_def::freq1, tonepair_def::freq2, tonepair, and tonepair_def::vol.

Referenced by ast_tonepair(), play_dialtone(), play_tone_pair(), rpt_tele_thread(), and sendnoise().

04454 {
04455    struct tonepair_def d = { 0, };
04456 
04457    d.freq1 = freq1;
04458    d.freq2 = freq2;
04459    d.duration = duration;
04460    d.vol = (vol < 1) ? 8192 : vol; /* force invalid to 8192 */
04461    if (ast_activate_generator(chan, &tonepair, &d))
04462       return -1;
04463    return 0;
04464 }

void ast_tonepair_stop ( struct ast_channel chan  ) 

Stop a tone from playing

Definition at line 4466 of file channel.c.

References ast_deactivate_generator().

Referenced by sendnoise().

04467 {
04468    ast_deactivate_generator(chan);
04469 }

int ast_transfer ( struct ast_channel chan,
char *  dest 
)

Transfer a channel (if supported). Returns -1 on error, 0 if not supported and 1 if supported and requested.

Called by:

Definition at line 3201 of file channel.c.

References ast_channel_lock, ast_channel_unlock, ast_check_hangup(), AST_FLAG_ZOMBIE, ast_test_flag, ast_channel::tech, and ast_channel_tech::transfer.

Referenced by transfer_exec().

03202 {
03203    int res = -1;
03204 
03205    /* Stop if we're a zombie or need a soft hangup */
03206    ast_channel_lock(chan);
03207    if (!ast_test_flag(chan, AST_FLAG_ZOMBIE) && !ast_check_hangup(chan)) {
03208       if (chan->tech->transfer) {
03209          res = chan->tech->transfer(chan, dest);
03210          if (!res)
03211             res = 1;
03212       } else
03213          res = 0;
03214    }
03215    ast_channel_unlock(chan);
03216    return res;
03217 }

char* ast_transfercapability2str ( int  transfercapability  )  const

Gives the string form of a given transfer capability.

Parameters:
transfercapability transfercapabilty to get the name of Give a name to a transfercapbility See above Returns the text form of the binary transfer capbility

Definition at line 634 of file channel.c.

References AST_TRANS_CAP_3_1K_AUDIO, AST_TRANS_CAP_DIGITAL, AST_TRANS_CAP_DIGITAL_W_TONES, AST_TRANS_CAP_RESTRICTED_DIGITAL, AST_TRANS_CAP_SPEECH, and AST_TRANS_CAP_VIDEO.

Referenced by cb_events(), dahdi_call(), dahdi_new(), misdn_call(), and oh323_call().

00635 {
00636    switch(transfercapability) {
00637    case AST_TRANS_CAP_SPEECH:
00638       return "SPEECH";
00639    case AST_TRANS_CAP_DIGITAL:
00640       return "DIGITAL";
00641    case AST_TRANS_CAP_RESTRICTED_DIGITAL:
00642       return "RESTRICTED_DIGITAL";
00643    case AST_TRANS_CAP_3_1K_AUDIO:
00644       return "3K1AUDIO";
00645    case AST_TRANS_CAP_DIGITAL_W_TONES:
00646       return "DIGITAL_W_TONES";
00647    case AST_TRANS_CAP_VIDEO:
00648       return "VIDEO";
00649    default:
00650       return "UNKNOWN";
00651    }
00652 }

void ast_uninstall_music_functions ( void   ) 

Definition at line 4534 of file channel.c.

References ast_moh_cleanup_ptr, ast_moh_start_ptr, and ast_moh_stop_ptr.

Referenced by unload_module().

04535 {
04536    ast_moh_start_ptr = NULL;
04537    ast_moh_stop_ptr = NULL;
04538    ast_moh_cleanup_ptr = NULL;
04539 }

int ast_waitfor ( struct ast_channel chan,
int  ms 
)

Wait for input on a channel.

Parameters:
chan channel to wait on
ms length of time to wait on the channel Wait for input on a channel for a given # of milliseconds (<0 for indefinite).
Returns:
Returns < 0 on failure, 0 if nothing ever arrived, and the # of ms remaining otherwise

Definition at line 1821 of file channel.c.

References ast_waitfor_nandfds().

Referenced by __adsi_transmit_messages(), __ast_play_and_record(), __ast_request_and_dial(), adsi_careful_send(), agent_ack_sleep(), ast_dtmf_stream(), ast_recvtext(), ast_safe_sleep_conditional(), ast_tonepair(), async_wait(), background_detect_exec(), channel_spy(), conf_exec(), conf_flush(), dictate_exec(), disa_exec(), do_idle_thread(), do_waiting(), echo_exec(), handle_recordfile(), ices_exec(), isAnsweringMachine(), measurenoise(), mp3_exec(), NBScat_exec(), receive_dtmf_digits(), recordthread(), send_tone_burst(), send_waveform_to_channel(), sendurl_exec(), speech_background(), ss_thread(), wait_for_hangup(), waitforring_exec(), and waitstream_core().

01822 {
01823    int oldms = ms;   /* -1 if no timeout */
01824 
01825    ast_waitfor_nandfds(&c, 1, NULL, 0, NULL, NULL, &ms);
01826    if ((ms < 0) && (oldms < 0))
01827       ms = 0;
01828    return ms;
01829 }

struct ast_channel* ast_waitfor_n ( struct ast_channel **  chan,
int  n,
int *  ms 
)

Waits for input on a group of channels Wait for input on an array of channels for a given # of milliseconds.

Returns:
Return channel with activity, or NULL if none has activity.
Parameters:
chan an array of pointers to channels
n number of channels that are to be waited upon
ms time "ms" is modified in-place, if applicable

Definition at line 1816 of file channel.c.

References ast_waitfor_nandfds().

Referenced by ast_feature_request_and_dial(), ast_udptl_bridge(), autoservice_run(), bridge_native_loop(), dahdi_bridge(), misdn_bridge(), monitor_dial(), rpt(), wait_for_answer(), and wait_for_winner().

01817 {
01818    return ast_waitfor_nandfds(c, n, NULL, 0, NULL, NULL, ms);
01819 }

int ast_waitfor_n_fd ( int *  fds,
int  n,
int *  ms,
int *  exception 
)

Waits for input on an fd This version works on fd's only. Be careful with it.

Definition at line 1660 of file channel.c.

References ast_waitfor_nandfds().

Referenced by dundi_lookup_internal(), and dundi_precache_internal().

01661 {
01662    int winner = -1;
01663    ast_waitfor_nandfds(NULL, 0, fds, n, exception, &winner, ms);
01664    return winner;
01665 }

struct ast_channel* ast_waitfor_nandfds ( struct ast_channel **  chan,
int  n,
int *  fds,
int  nfds,
int *  exception,
int *  outfd,
int *  ms 
)

Waits for activity on a group of channels.

Parameters:
chan an array of pointers to channels
n number of channels that are to be waited upon
fds an array of fds to wait upon
nfds the number of fds to wait upon
exception exception flag
outfd fd that had activity on it
ms how long the wait was Big momma function here. Wait for activity on any of the n channels, or any of the nfds file descriptors.
Returns:
Returns the channel with activity, or NULL on error or if an FD came first. If the FD came first, it will be returned in outfd, otherwise, outfd will be -1

Definition at line 1668 of file channel.c.

References ast_channel::_softhangup, ast_add_fd(), ast_channel_lock, ast_channel_unlock, ast_clear_flag, ast_do_masquerade(), AST_FLAG_BLOCKING, AST_FLAG_EXCEPTION, ast_log(), AST_MAX_FDS, ast_set_flag, AST_SOFTHANGUP_TIMEOUT, ast_tvdiff_ms(), ast_tvnow(), CHECK_BLOCKING, errno, pollfd::fd, poll(), POLLPRI, and ast_channel::whentohangup.

Referenced by app_exec(), ast_waitfor(), ast_waitfor_n(), ast_waitfor_n_fd(), ast_waitfordigit_full(), conf_run(), find_cache(), run_agi(), and waitstream_core().

01670 {
01671    struct timeval start = { 0 , 0 };
01672    struct pollfd *pfds = NULL;
01673    int res;
01674    long rms;
01675    int x, y, max;
01676    int sz;
01677    time_t now = 0;
01678    long whentohangup = 0, diff;
01679    struct ast_channel *winner = NULL;
01680    struct fdmap {
01681       int chan;
01682       int fdno;
01683    } *fdmap = NULL;
01684 
01685    if ((sz = n * AST_MAX_FDS + nfds)) {
01686       pfds = alloca(sizeof(*pfds) * sz);
01687       fdmap = alloca(sizeof(*fdmap) * sz);
01688    }
01689 
01690    if (outfd)
01691       *outfd = -99999;
01692    if (exception)
01693       *exception = 0;
01694    
01695    /* Perform any pending masquerades */
01696    for (x=0; x < n; x++) {
01697       ast_channel_lock(c[x]);
01698       if (c[x]->masq) {
01699          if (ast_do_masquerade(c[x])) {
01700             ast_log(LOG_WARNING, "Masquerade failed\n");
01701             *ms = -1;
01702             ast_channel_unlock(c[x]);
01703             return NULL;
01704          }
01705       }
01706       if (c[x]->whentohangup) {
01707          if (!whentohangup)
01708             time(&now);
01709          diff = c[x]->whentohangup - now;
01710          if (diff < 1) {
01711             /* Should already be hungup */
01712             c[x]->_softhangup |= AST_SOFTHANGUP_TIMEOUT;
01713             ast_channel_unlock(c[x]);
01714             return c[x];
01715          }
01716          if (!whentohangup || (diff < whentohangup))
01717             whentohangup = diff;
01718       }
01719       ast_channel_unlock(c[x]);
01720    }
01721    /* Wait full interval */
01722    rms = *ms;
01723    if (whentohangup) {
01724       rms = whentohangup * 1000;              /* timeout in milliseconds */
01725       if (*ms >= 0 && *ms < rms)    /* original *ms still smaller */
01726          rms =  *ms;
01727    }
01728    /*
01729     * Build the pollfd array, putting the channels' fds first,
01730     * followed by individual fds. Order is important because
01731     * individual fd's must have priority over channel fds.
01732     */
01733    max = 0;
01734    for (x=0; x<n; x++) {
01735       for (y=0; y<AST_MAX_FDS; y++) {
01736          fdmap[max].fdno = y;  /* fd y is linked to this pfds */
01737          fdmap[max].chan = x;  /* channel x is linked to this pfds */
01738          max += ast_add_fd(&pfds[max], c[x]->fds[y]);
01739       }
01740       CHECK_BLOCKING(c[x]);
01741    }
01742    /* Add the individual fds */
01743    for (x=0; x<nfds; x++) {
01744       fdmap[max].chan = -1;
01745       max += ast_add_fd(&pfds[max], fds[x]);
01746    }
01747 
01748    if (*ms > 0)
01749       start = ast_tvnow();
01750    
01751    if (sizeof(int) == 4) { /* XXX fix timeout > 600000 on linux x86-32 */
01752       do {
01753          int kbrms = rms;
01754          if (kbrms > 600000)
01755             kbrms = 600000;
01756          res = poll(pfds, max, kbrms);
01757          if (!res)
01758             rms -= kbrms;
01759       } while (!res && (rms > 0));
01760    } else {
01761       res = poll(pfds, max, rms);
01762    }
01763    for (x=0; x<n; x++)
01764       ast_clear_flag(c[x], AST_FLAG_BLOCKING);
01765    if (res < 0) { /* Simulate a timeout if we were interrupted */
01766       if (errno != EINTR)
01767          *ms = -1;
01768       return NULL;
01769    }
01770    if (whentohangup) {   /* if we have a timeout, check who expired */
01771       time(&now);
01772       for (x=0; x<n; x++) {
01773          if (c[x]->whentohangup && now >= c[x]->whentohangup) {
01774             c[x]->_softhangup |= AST_SOFTHANGUP_TIMEOUT;
01775             if (winner == NULL)
01776                winner = c[x];
01777          }
01778       }
01779    }
01780    if (res == 0) { /* no fd ready, reset timeout and done */
01781       *ms = 0; /* XXX use 0 since we may not have an exact timeout. */
01782       return winner;
01783    }
01784    /*
01785     * Then check if any channel or fd has a pending event.
01786     * Remember to check channels first and fds last, as they
01787     * must have priority on setting 'winner'
01788     */
01789    for (x = 0; x < max; x++) {
01790       res = pfds[x].revents;
01791       if (res == 0)
01792          continue;
01793       if (fdmap[x].chan >= 0) {  /* this is a channel */
01794          winner = c[fdmap[x].chan]; /* override previous winners */
01795          if (res & POLLPRI)
01796             ast_set_flag(winner, AST_FLAG_EXCEPTION);
01797          else
01798             ast_clear_flag(winner, AST_FLAG_EXCEPTION);
01799          winner->fdno = fdmap[x].fdno;
01800       } else {       /* this is an fd */
01801          if (outfd)
01802             *outfd = pfds[x].fd;
01803          if (exception)
01804             *exception = (res & POLLPRI) ? -1 : 0;
01805          winner = NULL;
01806       }
01807    }
01808    if (*ms > 0) {
01809       *ms -= ast_tvdiff_ms(ast_tvnow(), start);
01810       if (*ms < 0)
01811          *ms = 0;
01812    }
01813    return winner;
01814 }

int ast_waitfordigit ( struct ast_channel c,
int  ms 
)

Waits for a digit.

!

Parameters:
c channel to wait for a digit on
ms how many milliseconds to wait
Returns:
Returns <0 on error, 0 on no entry, and the digit on success.

Definition at line 1832 of file channel.c.

References ast_waitfordigit_full().

Referenced by _while_exec(), advanced_options(), ast_adsi_get_cpeid(), ast_adsi_get_cpeinfo(), ast_adsi_print(), ast_adsi_read_encoded_dtmf(), ast_adsi_transmit_message_full(), ast_app_dtget(), ast_control_streamfile(), ast_record_review(), collect_digits(), common_exec(), cpeid_exec(), dialout(), directory_exec(), do_atxfer(), forward_message(), get_folder(), ivr_dispatch(), mgcp_ss(), my_getsigstr(), pbx_builtin_waitexten(), play_mailbox_owner(), play_record_review(), read_exec(), read_newoption(), retrydial_exec(), sendnoise(), ss_thread(), testclient_exec(), testserver_exec(), vm_execmain(), vm_forwardoptions(), vm_instructions(), vm_options(), vm_tempgreeting(), wait_a_bit(), and wait_our_turn().

01833 {
01834    return ast_waitfordigit_full(c, ms, -1, -1);
01835 }

int ast_waitfordigit_full ( struct ast_channel c,
int  ms,
int  audiofd,
int  ctrlfd 
)

Wait for a digit Same as ast_waitfordigit() with audio fd for outputting read audio and ctrlfd to monitor for reading.

Parameters:
c channel to wait for a digit on
ms how many milliseconds to wait
audiofd audio file descriptor to write to if audio frames are received
ctrlfd control file descriptor to monitor for reading
Returns:
Returns 1 if ctrlfd becomes available

Definition at line 1856 of file channel.c.

References ast_check_hangup(), ast_clear_flag, AST_CONTROL_ANSWER, AST_CONTROL_HANGUP, AST_CONTROL_RINGING, AST_CONTROL_SRCUPDATE, AST_FLAG_END_DTMF_ONLY, AST_FLAG_ZOMBIE, AST_FRAME_CONTROL, AST_FRAME_DTMF_BEGIN, AST_FRAME_DTMF_END, AST_FRAME_VOICE, ast_frfree, ast_log(), ast_read(), ast_set_flag, ast_test_flag, ast_waitfor_nandfds(), errno, and f.

Referenced by ast_readstring_full(), ast_waitfordigit(), handle_getoption(), and handle_waitfordigit().

01857 {
01858    /* Stop if we're a zombie or need a soft hangup */
01859    if (ast_test_flag(c, AST_FLAG_ZOMBIE) || ast_check_hangup(c))
01860       return -1;
01861 
01862    /* Only look for the end of DTMF, don't bother with the beginning and don't emulate things */
01863    ast_set_flag(c, AST_FLAG_END_DTMF_ONLY);
01864 
01865    /* Wait for a digit, no more than ms milliseconds total. */
01866    while (ms) {
01867       struct ast_channel *rchan;
01868       int outfd;
01869 
01870       errno = 0;
01871       rchan = ast_waitfor_nandfds(&c, 1, &cmdfd, (cmdfd > -1) ? 1 : 0, NULL, &outfd, &ms);
01872       if (!rchan && outfd < 0 && ms) {
01873          if (errno == 0 || errno == EINTR)
01874             continue;
01875          ast_log(LOG_WARNING, "Wait failed (%s)\n", strerror(errno));
01876          ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01877          return -1;
01878       } else if (outfd > -1) {
01879          /* The FD we were watching has something waiting */
01880          ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01881          return 1;
01882       } else if (rchan) {
01883          int res;
01884          struct ast_frame *f = ast_read(c);
01885          if (!f)
01886             return -1;
01887 
01888          switch(f->frametype) {
01889          case AST_FRAME_DTMF_BEGIN:
01890             break;
01891          case AST_FRAME_DTMF_END:
01892             res = f->subclass;
01893             ast_frfree(f);
01894             ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01895             return res;
01896          case AST_FRAME_CONTROL:
01897             switch(f->subclass) {
01898             case AST_CONTROL_HANGUP:
01899                ast_frfree(f);
01900                ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01901                return -1;
01902             case AST_CONTROL_RINGING:
01903             case AST_CONTROL_ANSWER:
01904             case AST_CONTROL_SRCUPDATE:
01905                /* Unimportant */
01906                break;
01907             default:
01908                ast_log(LOG_WARNING, "Unexpected control subclass '%d'\n", f->subclass);
01909                break;
01910             }
01911             break;
01912          case AST_FRAME_VOICE:
01913             /* Write audio if appropriate */
01914             if (audiofd > -1) {
01915                if (write(audiofd, f->data, f->datalen) < 0) {
01916                   ast_log(LOG_WARNING, "write() failed: %s\n", strerror(errno));
01917                }
01918             }
01919          default:
01920             /* Ignore */
01921             break;
01922          }
01923          ast_frfree(f);
01924       }
01925    }
01926 
01927    ast_clear_flag(c, AST_FLAG_END_DTMF_ONLY);
01928 
01929    return 0; /* Time is up */
01930 }

struct ast_channel* ast_walk_channel_by_exten_locked ( const struct ast_channel chan,
const char *  exten,
const char *  context 
)

Get next channel by exten (and optionally context) and lock it.

Definition at line 1166 of file channel.c.

References channel_find_locked().

Referenced by next_channel().

01168 {
01169    return channel_find_locked(chan, NULL, 0, context, exten);
01170 }

struct ast_channel* ast_walk_channel_by_name_prefix_locked ( const struct ast_channel chan,
const char *  name,
const int  namelen 
)

Get channel by name prefix (locks channel).

Definition at line 1153 of file channel.c.

References channel_find_locked().

Referenced by next_channel().

01155 {
01156    return channel_find_locked(chan, name, namelen, NULL, NULL);
01157 }

int ast_write ( struct ast_channel chan,
struct ast_frame frame 
)

Write a frame to a channel This function writes the given frame to the indicated channel.

Parameters:
chan destination channel of the frame
frame frame that will be written
Returns:
It returns 0 on success, -1 on failure.

Todo:
XXX should return 0 maybe ?

Definition at line 2723 of file channel.c.

References ast_channel::_softhangup, AST_AUDIOHOOK_DIRECTION_WRITE, ast_audiohook_write_list(), ast_channel_lock, ast_channel_trylock, ast_channel_unlock, ast_check_hangup(), ast_clear_flag, AST_CONTROL_UNHOLD, ast_deactivate_generator(), ast_do_masquerade(), AST_FLAG_BLOCKING, AST_FLAG_WRITE_INT, AST_FLAG_ZOMBIE, AST_FRAME_CONTROL, AST_FRAME_DTMF_BEGIN, AST_FRAME_DTMF_END, ast_frame_dump(), AST_FRAME_HTML, AST_FRAME_IAX, AST_FRAME_MODEM, AST_FRAME_NULL, AST_FRAME_TEXT, AST_FRAME_VIDEO, AST_FRAME_VOICE, ast_frfree, ast_log(), AST_MONITOR_RUNNING, ast_seekstream(), ast_senddigit_begin(), ast_senddigit_end(), AST_SOFTHANGUP_DEV, ast_test_flag, ast_translate(), ast_writestream(), ast_channel::audiohooks, CHECK_BLOCKING, ast_frame::data, ast_frame::datalen, DEBUGCHAN_FLAG, f, ast_channel::fout, FRAMECOUNT_INC, ast_frame::frametype, ast_channel::generatordata, ast_channel_tech::indicate, ast_channel::insmpl, ast_frame::len, LOG_DEBUG, ast_channel::masq, ast_channel::masqr, ast_channel::monitor, MONITOR_DELAY, ast_channel::name, option_debug, ast_channel::outsmpl, ast_channel::rawwriteformat, SEEK_FORCECUR, ast_channel_tech::send_html, ast_channel_tech::send_text, ast_channel_monitor::state, ast_frame::subclass, ast_channel::tech, ast_channel_tech::write, ast_channel_monitor::write_stream, ast_channel_tech::write_video, and ast_channel::writetrans.

Referenced by adsi_careful_send(), agent_write(), ast_prod(), ast_readaudio_callback(), ast_readvideo_callback(), ast_udptl_bridge(), ast_write_video(), bridge_native_loop(), conf_queue_dtmf(), conf_run(), dahdi_bridge(), dictate_exec(), echo_exec(), features_write(), function_ilink(), gen_generate(), handle_link_data(), jb_get_and_deliver(), linear_generator(), milliwatt_generate(), misdn_bridge(), moh_files_generator(), moh_generate(), mp3_exec(), NBScat_exec(), rpt(), send_link_dtmf(), send_tone_burst(), send_waveform_to_channel(), silence_generator_generate(), spy_generate(), and wait_for_answer().

02724 {
02725    int res = -1;
02726    int count = 0;
02727    struct ast_frame *f = NULL, *f2 = NULL;
02728 
02729    /*Deadlock avoidance*/
02730    while(ast_channel_trylock(chan)) {
02731       /*cannot goto done since the channel is not locked*/
02732       if(count++ > 10) {
02733          if(option_debug)
02734             ast_log(LOG_DEBUG, "Deadlock avoided for write to channel '%s'\n", chan->name);
02735          return 0;
02736       }
02737       usleep(1);
02738    }
02739    /* Stop if we're a zombie or need a soft hangup */
02740    if (ast_test_flag(chan, AST_FLAG_ZOMBIE) || ast_check_hangup(chan))
02741       goto done;
02742 
02743    /* Handle any pending masquerades */
02744    if (chan->masq && ast_do_masquerade(chan)) {
02745       ast_log(LOG_WARNING, "Failed to perform masquerade\n");
02746       goto done;
02747    }
02748    if (chan->masqr) {
02749       res = 0; /* XXX explain, why 0 ? */
02750       goto done;
02751    }
02752    if (chan->generatordata) {
02753       if (ast_test_flag(chan, AST_FLAG_WRITE_INT))
02754          ast_deactivate_generator(chan);
02755       else {
02756          if (fr->frametype == AST_FRAME_DTMF_END) {
02757             /* There is a generator running while we're in the middle of a digit.
02758              * It's probably inband DTMF, so go ahead and pass it so it can
02759              * stop the generator */
02760             ast_clear_flag(chan, AST_FLAG_BLOCKING);
02761             ast_channel_unlock(chan);
02762             res = ast_senddigit_end(chan, fr->subclass, fr->len);
02763             ast_channel_lock(chan);
02764             CHECK_BLOCKING(chan);
02765          } else if (fr->frametype == AST_FRAME_CONTROL && fr->subclass == AST_CONTROL_UNHOLD) {
02766             /* This is a side case where Echo is basically being called and the person put themselves on hold and took themselves off hold */
02767             res = (chan->tech->indicate == NULL) ? 0 :
02768                chan->tech->indicate(chan, fr->subclass, fr->data, fr->datalen);
02769          }
02770          res = 0; /* XXX explain, why 0 ? */
02771          goto done;
02772       }
02773    }
02774    /* High bit prints debugging */
02775    if (chan->fout & DEBUGCHAN_FLAG)
02776       ast_frame_dump(chan->name, fr, ">>");
02777    CHECK_BLOCKING(chan);
02778    switch(fr->frametype) {
02779    case AST_FRAME_CONTROL:
02780       res = (chan->tech->indicate == NULL) ? 0 :
02781          chan->tech->indicate(chan, fr->subclass, fr->data, fr->datalen);
02782       break;
02783    case AST_FRAME_DTMF_BEGIN:
02784       if (chan->audiohooks) {
02785          struct ast_frame *old_frame = fr;
02786          fr = ast_audiohook_write_list(chan, chan->audiohooks, AST_AUDIOHOOK_DIRECTION_WRITE, fr);
02787          if (old_frame != fr)
02788             f = fr;
02789       }
02790       ast_clear_flag(chan, AST_FLAG_BLOCKING);
02791       ast_channel_unlock(chan);
02792       res = ast_senddigit_begin(chan, fr->subclass);
02793       ast_channel_lock(chan);
02794       CHECK_BLOCKING(chan);
02795       break;
02796    case AST_FRAME_DTMF_END:
02797       if (chan->audiohooks) {
02798          struct ast_frame *old_frame = fr;
02799          fr = ast_audiohook_write_list(chan, chan->audiohooks, AST_AUDIOHOOK_DIRECTION_WRITE, fr);
02800          if (old_frame != fr)
02801             f = fr;
02802       }
02803       ast_clear_flag(chan, AST_FLAG_BLOCKING);
02804       ast_channel_unlock(chan);
02805       res = ast_senddigit_end(chan, fr->subclass, fr->len);
02806       ast_channel_lock(chan);
02807       CHECK_BLOCKING(chan);
02808       break;
02809    case AST_FRAME_TEXT:
02810       res = (chan->tech->send_text == NULL) ? 0 :
02811          chan->tech->send_text(chan, (char *) fr->data);
02812       break;
02813    case AST_FRAME_HTML:
02814       res = (chan->tech->send_html == NULL) ? 0 :
02815          chan->tech->send_html(chan, fr->subclass, (char *) fr->data, fr->datalen);
02816       break;
02817    case AST_FRAME_VIDEO:
02818       /* XXX Handle translation of video codecs one day XXX */
02819       res = (chan->tech->write_video == NULL) ? 0 :
02820          chan->tech->write_video(chan, fr);
02821       break;
02822    case AST_FRAME_MODEM:
02823       res = (chan->tech->write == NULL) ? 0 :
02824          chan->tech->write(chan, fr);
02825       break;
02826    case AST_FRAME_VOICE:
02827       if (chan->tech->write == NULL)
02828          break;   /*! \todo XXX should return 0 maybe ? */
02829 
02830       if (chan->audiohooks) {
02831          struct ast_frame *old_frame = fr;
02832          fr = ast_audiohook_write_list(chan, chan->audiohooks, AST_AUDIOHOOK_DIRECTION_WRITE, fr);
02833          if (old_frame != fr)
02834             f2 = fr;
02835       }
02836       
02837       /* If the frame is in the raw write format, then it's easy... just use the frame - otherwise we will have to translate */
02838       if (fr->subclass == chan->rawwriteformat)
02839          f = fr;
02840       else
02841          f = (chan->writetrans) ? ast_translate(chan->writetrans, fr, 0) : fr;
02842 
02843       /* If we have no frame of audio, then we have to bail out */
02844       if (!f) {
02845          res = 0;
02846          break;
02847       }
02848 
02849       /* If Monitor is running on this channel, then we have to write frames out there too */
02850       if (chan->monitor && chan->monitor->write_stream) {
02851          /* XXX must explain this code */
02852 #ifndef MONITOR_CONSTANT_DELAY
02853          int jump = chan->insmpl - chan->outsmpl - 4 * f->samples;
02854          if (jump >= 0) {
02855             jump = chan->insmpl - chan->outsmpl;
02856             if (ast_seekstream(chan->monitor->write_stream, jump, SEEK_FORCECUR) == -1)
02857                ast_log(LOG_WARNING, "Failed to perform seek in monitoring write stream, synchronization between the files may be broken\n");
02858             chan->outsmpl += jump + f->samples;
02859          } else
02860             chan->outsmpl += f->samples;
02861 #else
02862          int jump = chan->insmpl - chan->outsmpl;
02863          if (jump - MONITOR_DELAY >= 0) {
02864             if (ast_seekstream(chan->monitor->write_stream, jump - f->samples, SEEK_FORCECUR) == -1)
02865                ast_log(LOG_WARNING, "Failed to perform seek in monitoring write stream, synchronization between the files may be broken\n");
02866             chan->outsmpl += jump;
02867          } else
02868             chan->outsmpl += f->samples;
02869 #endif
02870          if (chan->monitor->state == AST_MONITOR_RUNNING) {
02871             if (ast_writestream(chan->monitor->write_stream, f) < 0)
02872                ast_log(LOG_WARNING, "Failed to write data to channel monitor write stream\n");
02873          }
02874       }
02875 
02876       if (f) 
02877          res = chan->tech->write(chan,f);
02878       else
02879          res = 0;
02880       break;
02881    case AST_FRAME_NULL:
02882    case AST_FRAME_IAX:
02883       /* Ignore these */
02884       res = 0;
02885       break;
02886    default:
02887       /* At this point, fr is the incoming frame and f is NULL.  Channels do
02888        * not expect to get NULL as a frame pointer and will segfault.  Hence,
02889        * we output the original frame passed in. */
02890       res = chan->tech->write(chan, fr);
02891       break;
02892    }
02893 
02894    if (f && f != fr)
02895       ast_frfree(f);
02896    if (f2)
02897       ast_frfree(f2);
02898    ast_clear_flag(chan, AST_FLAG_BLOCKING);
02899    /* Consider a write failure to force a soft hangup */
02900    if (res < 0)
02901       chan->_softhangup |= AST_SOFTHANGUP_DEV;
02902    else {
02903       chan->fout = FRAMECOUNT_INC(chan->fout);
02904    }
02905 done:
02906    ast_channel_unlock(chan);
02907    return res;
02908 }

int ast_write_video ( struct ast_channel chan,
struct ast_frame frame 
)

Write video frame to a channel This function writes the given frame to the indicated channel.

Parameters:
chan destination channel of the frame
frame frame that will be written
Returns:
It returns 1 on success, 0 if not implemented, and -1 on failure.

Definition at line 2712 of file channel.c.

References ast_write(), ast_channel::tech, and ast_channel_tech::write_video.

02713 {
02714    int res;
02715    if (!chan->tech->write_video)
02716       return 0;
02717    res = ast_write(chan, fr);
02718    if (!res)
02719       res = 1;
02720    return res;
02721 }

static void bridge_playfile ( struct ast_channel chan,
struct ast_channel peer,
const char *  sound,
int  remain 
) [static]

Definition at line 3856 of file channel.c.

References ast_autoservice_start(), ast_autoservice_stop(), AST_DIGIT_ANY, ast_say_number(), ast_stream_and_wait(), and ast_channel::language.

Referenced by ast_channel_bridge().

03857 {
03858    int min = 0, sec = 0, check;
03859 
03860    check = ast_autoservice_start(peer);
03861    if (check)
03862       return;
03863 
03864    if (remain > 0) {
03865       if (remain / 60 > 1) {
03866          min = remain / 60;
03867          sec = remain % 60;
03868       } else {
03869          sec = remain;
03870       }
03871    }
03872    
03873    if (!strcmp(sound,"timeleft")) { /* Queue support */
03874       ast_stream_and_wait(chan, "vm-youhave", chan->language, "");
03875       if (min) {
03876          ast_say_number(chan, min, AST_DIGIT_ANY, chan->language, NULL);
03877          ast_stream_and_wait(chan, "queue-minutes", chan->language, "");
03878       }
03879       if (sec) {
03880          ast_say_number(chan, sec, AST_DIGIT_ANY, chan->language, NULL);
03881          ast_stream_and_wait(chan, "queue-seconds", chan->language, "");
03882       }
03883    } else {
03884       ast_stream_and_wait(chan, sound, chan->language, "");
03885    }
03886 
03887    ast_autoservice_stop(peer);
03888 }

static struct ast_channel* channel_find_locked ( const struct ast_channel prev,
const char *  name,
const int  namelen,
const char *  context,
const char *  exten 
) [static]

Helper function to find channels.

It supports these modes:

prev != NULL : get channel next in list after prev name != NULL : get channel with matching name name != NULL && namelen != 0 : get channel whose name starts with prefix exten != NULL : get channel whose exten or macroexten matches context != NULL && exten != NULL : get channel whose context or macrocontext

It returns with the channel's lock held. If getting the individual lock fails, unlock and retry quickly up to 10 times, then give up.

Note:
XXX Note that this code has cost O(N) because of the need to verify that the object is still on the global list.

XXX also note that accessing fields (e.g. c->name in ast_log()) can only be done with the lock held or someone could delete the object while we work on it. This causes some ugliness in the code. Note that removing the first ast_log() may be harmful, as it would shorten the retry period and possibly cause failures. We should definitely go for a better scheme that is deadlock-free.

Note:
We're done searching through the list for the previous item. Any item after this point, we want to evaluate for a match. If we didn't set prev to NULL here, then we would only return matches for the first matching item (since the above "if (c != prev)" would not permit any other potential matches to reach the additional matching logic, below). Instead, it would just iterate until it once again found the original match, then iterate down to the end of the list and quit.

Definition at line 1049 of file channel.c.

References ast_channel_trylock, AST_LIST_LOCK, AST_LIST_NEXT, AST_LIST_TRAVERSE, AST_LIST_UNLOCK, ast_log(), ast_channel::context, ast_channel::exten, LOG_DEBUG, ast_channel::macrocontext, ast_channel::macroexten, ast_channel::name, and option_debug.

Referenced by ast_channel_walk_locked(), ast_get_channel_by_exten_locked(), ast_get_channel_by_name_locked(), ast_get_channel_by_name_prefix_locked(), ast_walk_channel_by_exten_locked(), and ast_walk_channel_by_name_prefix_locked().

01052 {
01053    const char *msg = prev ? "deadlock" : "initial deadlock";
01054    int retries;
01055    struct ast_channel *c;
01056    const struct ast_channel *_prev = prev;
01057 
01058    for (retries = 0; retries < 200; retries++) {
01059       int done;
01060       /* Reset prev on each retry.  See note below for the reason. */
01061       prev = _prev;
01062       AST_LIST_LOCK(&channels);
01063       AST_LIST_TRAVERSE(&channels, c, chan_list) {
01064          if (prev) { /* look for last item, first, before any evaluation */
01065             if (c != prev) /* not this one */
01066                continue;
01067             /* found, prepare to return c->next */
01068             if ((c = AST_LIST_NEXT(c, chan_list)) == NULL) break;
01069             /*!\note
01070              * We're done searching through the list for the previous item.
01071              * Any item after this point, we want to evaluate for a match.
01072              * If we didn't set prev to NULL here, then we would only
01073              * return matches for the first matching item (since the above
01074              * "if (c != prev)" would not permit any other potential
01075              * matches to reach the additional matching logic, below).
01076              * Instead, it would just iterate until it once again found the
01077              * original match, then iterate down to the end of the list and
01078              * quit.
01079              */
01080             prev = NULL;
01081          }
01082          if (name) { /* want match by name */
01083             if ((!namelen && strcasecmp(c->name, name)) ||
01084                 (namelen && strncasecmp(c->name, name, namelen)))
01085                continue;   /* name match failed */
01086          } else if (exten) {
01087             if (context && strcasecmp(c->context, context) &&
01088                 strcasecmp(c->macrocontext, context))
01089                continue;   /* context match failed */
01090             if (strcasecmp(c->exten, exten) &&
01091                 strcasecmp(c->macroexten, exten))
01092                continue;   /* exten match failed */
01093          }
01094          /* if we get here, c points to the desired record */
01095          break;
01096       }
01097       /* exit if chan not found or mutex acquired successfully */
01098       /* this is slightly unsafe, as we _should_ hold the lock to access c->name */
01099       done = c == NULL || ast_channel_trylock(c) == 0;
01100       if (!done) {
01101          if (option_debug)
01102             ast_log(LOG_DEBUG, "Avoiding %s for channel '%p'\n", msg, c);
01103          if (retries == 199) {
01104             /* We are about to fail due to a deadlock, so report this
01105              * while we still have the list lock.
01106              */
01107             if (option_debug)
01108                ast_log(LOG_DEBUG, "Failure, could not lock '%p' after %d retries!\n", c, retries);
01109             /* As we have deadlocked, we will skip this channel and
01110              * see if there is another match.
01111              * NOTE: No point doing this for a full-name match,
01112              * as there can be no more matches.
01113              */
01114             if (!(name && !namelen)) {
01115                prev = c;
01116                retries = -1;
01117             }
01118          }
01119       }
01120       AST_LIST_UNLOCK(&channels);
01121       if (done)
01122          return c;
01123       /* If we reach this point we basically tried to lock a channel and failed. Instead of
01124        * starting from the beginning of the list we can restore our saved pointer to the previous
01125        * channel and start from there.
01126        */
01127       prev = _prev;
01128       usleep(1);  /* give other threads a chance before retrying */
01129    }
01130 
01131    return NULL;
01132 }

const char* channelreloadreason2txt ( enum channelreloadreason  reason  ) 

Convert enum channelreloadreason to text string for manager event.

\ brief Convert channel reloadreason (ENUM) to text string for manager event

Definition at line 4686 of file channel.c.

References CHANNEL_CLI_RELOAD, CHANNEL_MODULE_LOAD, and CHANNEL_MODULE_RELOAD.

04687 {
04688    switch (reason) {
04689    case CHANNEL_MODULE_LOAD:
04690       return "LOAD (Channel module load)";
04691 
04692    case CHANNEL_MODULE_RELOAD:
04693       return "RELOAD (Channel module reload)";
04694 
04695    case CHANNEL_CLI_RELOAD:
04696       return "CLIRELOAD (Channel module reload by CLI command)";
04697 
04698    default:
04699       return "MANAGERRELOAD (Channel module reload by manager)";
04700    }
04701 };

static void clone_variables ( struct ast_channel original,
struct ast_channel clone 
) [static]

Clone channel variables from 'clone' channel into 'original' channel.

All variables except those related to app_groupcount are cloned. Variables are actually _removed_ from 'clone' channel, presumably because it will subsequently be destroyed.

Note:
Assumes locks will be in place on both channels when called.

Definition at line 3483 of file channel.c.

References AST_LIST_APPEND_LIST, AST_LIST_FIRST, AST_LIST_INSERT_TAIL, AST_LIST_TRAVERSE, ast_var_assign(), ast_var_t::entries, ast_var_t::name, ast_var_t::value, and ast_channel::varshead.

Referenced by ast_do_masquerade().

03484 {
03485    struct ast_var_t *current, *newvar;
03486    /* Append variables from clone channel into original channel */
03487    /* XXX Is this always correct?  We have to in order to keep MACROS working XXX */
03488    if (AST_LIST_FIRST(&clone->varshead))
03489       AST_LIST_APPEND_LIST(&original->varshead, &clone->varshead, entries);
03490 
03491    /* then, dup the varshead list into the clone */
03492    
03493    AST_LIST_TRAVERSE(&original->varshead, current, entries) {
03494       newvar = ast_var_assign(current->name, current->value);
03495       if (newvar)
03496          AST_LIST_INSERT_TAIL(&clone->varshead, newvar, entries);
03497    }
03498 }

static char* complete_channeltypes ( const char *  line,
const char *  word,
int  pos,
int  state 
) [static]

Definition at line 334 of file channel.c.

References AST_LIST_TRAVERSE, chanlist::list, strdup, chanlist::tech, and ast_channel_tech::type.

00335 {
00336    struct chanlist *cl;
00337    int which = 0;
00338    int wordlen;
00339    char *ret = NULL;
00340 
00341    if (pos != 3)
00342       return NULL;
00343 
00344    wordlen = strlen(word);
00345 
00346    AST_LIST_TRAVERSE(&backends, cl, list) {
00347       if (!strncasecmp(word, cl->tech->type, wordlen) && ++which > state) {
00348          ret = strdup(cl->tech->type);
00349          break;
00350       }
00351    }
00352    
00353    return ret;
00354 }

static char* complete_channeltypes_deprecated ( const char *  line,
const char *  word,
int  pos,
int  state 
) [static]

Definition at line 312 of file channel.c.

References AST_LIST_TRAVERSE, chanlist::list, strdup, chanlist::tech, and ast_channel_tech::type.

00313 {
00314    struct chanlist *cl;
00315    int which = 0;
00316    int wordlen;
00317    char *ret = NULL;
00318 
00319    if (pos != 2)
00320       return NULL;
00321 
00322    wordlen = strlen(word);
00323 
00324    AST_LIST_TRAVERSE(&backends, cl, list) {
00325       if (!strncasecmp(word, cl->tech->type, wordlen) && ++which > state) {
00326          ret = strdup(cl->tech->type);
00327          break;
00328       }
00329    }
00330    
00331    return ret;
00332 }

static void free_cid ( struct ast_callerid cid  )  [static]

Definition at line 1199 of file channel.c.

References ast_callerid::cid_ani, ast_callerid::cid_dnid, ast_callerid::cid_name, ast_callerid::cid_num, ast_callerid::cid_rdnis, and free.

Referenced by ast_channel_free().

01200 {
01201    if (cid->cid_dnid)
01202       free(cid->cid_dnid);
01203    if (cid->cid_num)
01204       free(cid->cid_num);  
01205    if (cid->cid_name)
01206       free(cid->cid_name); 
01207    if (cid->cid_ani)
01208       free(cid->cid_ani);
01209    if (cid->cid_rdnis)
01210       free(cid->cid_rdnis);
01211 }

static void free_translation ( struct ast_channel clone  )  [static]

Definition at line 1446 of file channel.c.

References ast_translator_free_path(), ast_channel::nativeformats, ast_channel::rawreadformat, ast_channel::rawwriteformat, ast_channel::readtrans, and ast_channel::writetrans.

Referenced by ast_do_masquerade(), and ast_hangup().

01447 {
01448    if (clone->writetrans)
01449       ast_translator_free_path(clone->writetrans);
01450    if (clone->readtrans)
01451       ast_translator_free_path(clone->readtrans);
01452    clone->writetrans = NULL;
01453    clone->readtrans = NULL;
01454    clone->rawwriteformat = clone->nativeformats;
01455    clone->rawreadformat = clone->nativeformats;
01456 }

static int generator_force ( const void *  data  )  [static]

Definition at line 1601 of file channel.c.

References ast_channel_lock, ast_channel_unlock, ast_deactivate_generator(), AST_FORMAT_AUDIO_MASK, ast_format_rate(), ast_log(), LOG_DEBUG, and option_debug.

Referenced by ast_activate_generator(), and ast_read_generator_actions().

01602 {
01603    /* Called if generator doesn't have data */
01604    void *tmp;
01605    int res;
01606    int (*generate)(struct ast_channel *chan, void *tmp, int datalen, int samples) = NULL;
01607    struct ast_channel *chan = (struct ast_channel *)data;
01608 
01609    ast_channel_lock(chan);
01610    tmp = chan->generatordata;
01611    chan->generatordata = NULL;
01612    if (chan->generator)
01613       generate = chan->generator->generate;
01614    ast_channel_unlock(chan);
01615 
01616    if (!tmp || !generate)
01617       return 0;
01618 
01619    res = generate(chan, tmp, 0, ast_format_rate(chan->writeformat & AST_FORMAT_AUDIO_MASK) / 50);
01620 
01621    chan->generatordata = tmp;
01622 
01623    if (res) {
01624       if (option_debug)
01625          ast_log(LOG_DEBUG, "Auto-deactivating generator\n");
01626       ast_deactivate_generator(chan);
01627    }
01628 
01629    return 0;
01630 }

static int attribute_const is_visible_indication ( enum ast_control_frame_type  condition  )  [static]

Definition at line 2447 of file channel.c.

References AST_CONTROL_ANSWER, AST_CONTROL_BUSY, AST_CONTROL_CONGESTION, AST_CONTROL_FLASH, AST_CONTROL_HANGUP, AST_CONTROL_HOLD, AST_CONTROL_OFFHOOK, AST_CONTROL_OPTION, AST_CONTROL_PROCEEDING, AST_CONTROL_PROGRESS, AST_CONTROL_RADIO_KEY, AST_CONTROL_RADIO_UNKEY, AST_CONTROL_RING, AST_CONTROL_RINGING, AST_CONTROL_SRCUPDATE, AST_CONTROL_TAKEOFFHOOK, AST_CONTROL_UNHOLD, AST_CONTROL_VIDUPDATE, and AST_CONTROL_WINK.

Referenced by ast_indicate_data().

02448 {
02449    /* Don't include a default case here so that we get compiler warnings
02450     * when a new type is added. */
02451 
02452    switch (condition) {
02453    case AST_CONTROL_PROGRESS:
02454    case AST_CONTROL_PROCEEDING:
02455    case AST_CONTROL_VIDUPDATE:
02456    case AST_CONTROL_SRCUPDATE:
02457    case AST_CONTROL_RADIO_KEY:
02458    case AST_CONTROL_RADIO_UNKEY:
02459    case AST_CONTROL_OPTION:
02460    case AST_CONTROL_WINK:
02461    case AST_CONTROL_FLASH:
02462    case AST_CONTROL_OFFHOOK:
02463    case AST_CONTROL_TAKEOFFHOOK:
02464    case AST_CONTROL_ANSWER:
02465    case AST_CONTROL_HANGUP:
02466       return 0;
02467 
02468    case AST_CONTROL_CONGESTION:
02469    case AST_CONTROL_BUSY:
02470    case AST_CONTROL_RINGING:
02471    case AST_CONTROL_RING:
02472    case AST_CONTROL_HOLD:
02473    case AST_CONTROL_UNHOLD:
02474       return 1;
02475    }
02476 
02477    return 0;
02478 }

static void queue_dtmf_readq ( struct ast_channel chan,
struct ast_frame f 
) [inline, static]

Definition at line 1986 of file channel.c.

References AST_FRAME_DTMF_END, ast_queue_frame(), ast_channel::dtmff, f, ast_frame::frametype, ast_frame::len, and ast_frame::subclass.

Referenced by __ast_read().

01987 {
01988    struct ast_frame *fr = &chan->dtmff;
01989 
01990    fr->frametype = AST_FRAME_DTMF_END;
01991    fr->subclass = f->subclass;
01992    fr->len = f->len;
01993 
01994    /* The only time this function will be called is for a frame that just came
01995     * out of the channel driver.  So, we want to stick it on the tail of the
01996     * readq. */
01997 
01998    ast_queue_frame(chan, fr);
01999 }

static int set_format ( struct ast_channel chan,
int  fmt,
int *  rawformat,
int *  format,
struct ast_trans_pvt **  trans,
const int  direction 
) [static]

Definition at line 2910 of file channel.c.

References ast_channel_lock, ast_channel_unlock, AST_FORMAT_AUDIO_MASK, ast_getformatname(), ast_getformatname_multiple(), ast_log(), ast_translator_best_choice(), ast_translator_build_path(), ast_translator_free_path(), LOG_DEBUG, ast_channel::name, ast_channel::nativeformats, and option_debug.

Referenced by ast_set_read_format(), and ast_set_write_format().

02912 {
02913    int native;
02914    int res;
02915    char from[200], to[200];
02916    
02917    /* Make sure we only consider audio */
02918    fmt &= AST_FORMAT_AUDIO_MASK;
02919    
02920    native = chan->nativeformats;
02921    /* Find a translation path from the native format to one of the desired formats */
02922    if (!direction)
02923       /* reading */
02924       res = ast_translator_best_choice(&fmt, &native);
02925    else
02926       /* writing */
02927       res = ast_translator_best_choice(&native, &fmt);
02928 
02929    if (res < 0) {
02930       ast_log(LOG_WARNING, "Unable to find a codec translation path from %s to %s\n",
02931          ast_getformatname_multiple(from, sizeof(from), native),
02932          ast_getformatname_multiple(to, sizeof(to), fmt));
02933       return -1;
02934    }
02935    
02936    /* Now we have a good choice for both. */
02937    ast_channel_lock(chan);
02938 
02939    if ((*rawformat == native) && (*format == fmt) && ((*rawformat == *format) || (*trans))) {
02940       /* the channel is already in these formats, so nothing to do */
02941       ast_channel_unlock(chan);
02942       return 0;
02943    }
02944 
02945    *rawformat = native;
02946    /* User perspective is fmt */
02947    *format = fmt;
02948    /* Free any read translation we have right now */
02949    if (*trans)
02950       ast_translator_free_path(*trans);
02951    /* Build a translation path from the raw format to the desired format */
02952    if (!direction)
02953       /* reading */
02954       *trans = ast_translator_build_path(*format, *rawformat);
02955    else
02956       /* writing */
02957       *trans = ast_translator_build_path(*rawformat, *format);
02958    ast_channel_unlock(chan);
02959    if (option_debug)
02960       ast_log(LOG_DEBUG, "Set channel %s to %s format %s\n", chan->name,
02961          direction ? "write" : "read", ast_getformatname(fmt));
02962    return 0;
02963 }

static int should_skip_dtmf ( struct ast_channel chan  )  [inline, static]

Determine whether or not we should ignore DTMF in the readq.

Definition at line 2004 of file channel.c.

References AST_FLAG_DEFER_DTMF, AST_FLAG_EMULATE_DTMF, AST_MIN_DTMF_GAP, ast_test_flag, ast_tvdiff_ms(), ast_tvnow(), ast_tvzero(), and ast_channel::dtmf_tv.

Referenced by __ast_read().

02005 {
02006    if (ast_test_flag(chan, AST_FLAG_DEFER_DTMF | AST_FLAG_EMULATE_DTMF)) {
02007       /* We're in the middle of emulating a digit, or DTMF has been
02008        * explicitly deferred.  Skip this digit, then. */
02009       return 1;
02010    }
02011          
02012    if (!ast_tvzero(chan->dtmf_tv) && 
02013          ast_tvdiff_ms(ast_tvnow(), chan->dtmf_tv) < AST_MIN_DTMF_GAP) {
02014       /* We're not in the middle of a digit, but it hasn't been long enough
02015        * since the last digit, so we'll have to skip DTMF for now. */
02016       return 1;
02017    }
02018 
02019    return 0;
02020 }

static int show_channeltype ( int  fd,
int  argc,
char *  argv[] 
) [static]

Definition at line 259 of file channel.c.

References ast_cli(), AST_LIST_LOCK, AST_LIST_TRAVERSE, AST_LIST_UNLOCK, ast_log(), ast_channel_tech::capabilities, ast_channel_tech::devicestate, ast_channel_tech::indicate, chanlist::list, LOG_WARNING, RESULT_FAILURE, RESULT_SHOWUSAGE, RESULT_SUCCESS, ast_channel_tech::send_digit_begin, ast_channel_tech::send_digit_end, ast_channel_tech::send_html, ast_channel_tech::send_image, ast_channel_tech::send_text, chanlist::tech, ast_channel_tech::transfer, and ast_channel_tech::type.

00260 {
00261    struct chanlist *cl = NULL;
00262 
00263    if (argc != 4)
00264       return RESULT_SHOWUSAGE;
00265    
00266    if (AST_LIST_LOCK(&channels)) {
00267       ast_log(LOG_WARNING, "Unable to lock channel list\n");
00268       return RESULT_FAILURE;
00269    }
00270 
00271    AST_LIST_TRAVERSE(&backends, cl, list) {
00272       if (!strncasecmp(cl->tech->type, argv[3], strlen(cl->tech->type))) {
00273          break;
00274       }
00275    }
00276 
00277 
00278    if (!cl) {
00279       ast_cli(fd, "\n%s is not a registered channel driver.\n", argv[3]);
00280       AST_LIST_UNLOCK(&channels);
00281       return RESULT_FAILURE;
00282    }
00283 
00284    ast_cli(fd,
00285       "-- Info about channel driver: %s --\n"
00286       "  Device State: %s\n"
00287       "    Indication: %s\n"
00288       "     Transfer : %s\n"
00289       "  Capabilities: %d\n"
00290       "   Digit Begin: %s\n"
00291       "     Digit End: %s\n"
00292       "    Send HTML : %s\n"
00293       " Image Support: %s\n"
00294       "  Text Support: %s\n",
00295       cl->tech->type,
00296       (cl->tech->devicestate) ? "yes" : "no",
00297       (cl->tech->indicate) ? "yes" : "no",
00298       (cl->tech->transfer) ? "yes" : "no",
00299       (cl->tech->capabilities) ? cl->tech->capabilities : -1,
00300       (cl->tech->send_digit_begin) ? "yes" : "no",
00301       (cl->tech->send_digit_end) ? "yes" : "no",
00302       (cl->tech->send_html) ? "yes" : "no",
00303       (cl->tech->send_image) ? "yes" : "no",
00304       (cl->tech->send_text) ? "yes" : "no"
00305       
00306    );
00307 
00308    AST_LIST_UNLOCK(&channels);
00309    return RESULT_SUCCESS;
00310 }

static int show_channeltype_deprecated ( int  fd,
int  argc,
char *  argv[] 
) [static]

Definition at line 206 of file channel.c.

References ast_cli(), AST_LIST_LOCK, AST_LIST_TRAVERSE, AST_LIST_UNLOCK, ast_log(), ast_channel_tech::capabilities, ast_channel_tech::devicestate, ast_channel_tech::indicate, chanlist::list, LOG_WARNING, RESULT_FAILURE, RESULT_SHOWUSAGE, RESULT_SUCCESS, ast_channel_tech::send_digit_begin, ast_channel_tech::send_digit_end, ast_channel_tech::send_html, ast_channel_tech::send_image, ast_channel_tech::send_text, chanlist::tech, ast_channel_tech::transfer, and ast_channel_tech::type.

00207 {
00208    struct chanlist *cl = NULL;
00209 
00210    if (argc != 3)
00211       return RESULT_SHOWUSAGE;
00212    
00213    if (AST_LIST_LOCK(&channels)) {
00214       ast_log(LOG_WARNING, "Unable to lock channel list\n");
00215       return RESULT_FAILURE;
00216    }
00217 
00218    AST_LIST_TRAVERSE(&backends, cl, list) {
00219       if (!strncasecmp(cl->tech->type, argv[2], strlen(cl->tech->type))) {
00220          break;
00221       }
00222    }
00223 
00224 
00225    if (!cl) {
00226       ast_cli(fd, "\n%s is not a registered channel driver.\n", argv[2]);
00227       AST_LIST_UNLOCK(&channels);
00228       return RESULT_FAILURE;
00229    }
00230 
00231    ast_cli(fd,
00232       "-- Info about channel driver: %s --\n"
00233       "  Device State: %s\n"
00234       "    Indication: %s\n"
00235       "     Transfer : %s\n"
00236       "  Capabilities: %d\n"
00237       "   Digit Begin: %s\n"
00238       "     Digit End: %s\n"
00239       "    Send HTML : %s\n"
00240       " Image Support: %s\n"
00241       "  Text Support: %s\n",
00242       cl->tech->type,
00243       (cl->tech->devicestate) ? "yes" : "no",
00244       (cl->tech->indicate) ? "yes" : "no",
00245       (cl->tech->transfer) ? "yes" : "no",
00246       (cl->tech->capabilities) ? cl->tech->capabilities : -1,
00247       (cl->tech->send_digit_begin) ? "yes" : "no",
00248       (cl->tech->send_digit_end) ? "yes" : "no",
00249       (cl->tech->send_html) ? "yes" : "no",
00250       (cl->tech->send_image) ? "yes" : "no",
00251       (cl->tech->send_text) ? "yes" : "no"
00252       
00253    );
00254 
00255    AST_LIST_UNLOCK(&channels);
00256    return RESULT_SUCCESS;
00257 }

static int show_channeltypes ( int  fd,
int  argc,
char *  argv[] 
) [static]

Definition at line 179 of file channel.c.

References ast_cli(), AST_LIST_LOCK, AST_LIST_TRAVERSE, AST_LIST_UNLOCK, ast_log(), ast_channel_tech::description, ast_channel_tech::devicestate, FORMAT, ast_channel_tech::indicate, chanlist::list, LOG_WARNING, RESULT_SUCCESS, chanlist::tech, ast_channel_tech::transfer, and ast_channel_tech::type.

00180 {
00181 #define FORMAT  "%-10.10s  %-40.40s %-12.12s %-12.12s %-12.12s\n"
00182    struct chanlist *cl;
00183    int count_chan = 0;
00184 
00185    ast_cli(fd, FORMAT, "Type", "Description",       "Devicestate", "Indications", "Transfer");
00186    ast_cli(fd, FORMAT, "----------", "-----------", "-----------", "-----------", "--------");
00187    if (AST_LIST_LOCK(&channels)) {
00188       ast_log(LOG_WARNING, "Unable to lock channel list\n");
00189       return -1;
00190    }
00191    AST_LIST_TRAVERSE(&backends, cl, list) {
00192       ast_cli(fd, FORMAT, cl->tech->type, cl->tech->description,
00193          (cl->tech->devicestate) ? "yes" : "no",
00194          (cl->tech->indicate) ? "yes" : "no",
00195          (cl->tech->transfer) ? "yes" : "no");
00196       count_chan++;
00197    }
00198    AST_LIST_UNLOCK(&channels);
00199    ast_cli(fd, "----------\n%d channel drivers registered.\n", count_chan);
00200    return RESULT_SUCCESS;
00201 
00202 #undef FORMAT
00203 
00204 }

static void* silence_generator_alloc ( struct ast_channel chan,
void *  data 
) [static]

Definition at line 4607 of file channel.c.

04608 {
04609    /* just store the data pointer in the channel structure */
04610    return data;
04611 }

static int silence_generator_generate ( struct ast_channel chan,
void *  data,
int  len,
int  samples 
) [static]

Definition at line 4618 of file channel.c.

References AST_FORMAT_SLINEAR, AST_FRAME_VOICE, ast_write(), and ast_frame::frametype.

04619 {
04620    short buf[samples];
04621    struct ast_frame frame = {
04622       .frametype = AST_FRAME_VOICE,
04623       .subclass = AST_FORMAT_SLINEAR,
04624       .data = buf,
04625       .samples = samples,
04626       .datalen = sizeof(buf),
04627    };
04628    memset(buf, 0, sizeof(buf));
04629    if (ast_write(chan, &frame))
04630       return -1;
04631    return 0;
04632 }

static void silence_generator_release ( struct ast_channel chan,
void *  data 
) [static]

Definition at line 4613 of file channel.c.

04614 {
04615    /* nothing to do */
04616 }

static void state2str_threadbuf_init ( void   )  [static]

Definition at line 84 of file channel.c.

00098 {

static void* tonepair_alloc ( struct ast_channel chan,
void *  params 
) [static]

Definition at line 4371 of file channel.c.

References ast_calloc, AST_FLAG_WRITE_INT, AST_FORMAT_SLINEAR, ast_log(), ast_set_flag, ast_set_write_format(), tonepair_def::duration, tonepair_def::freq1, tonepair_def::freq2, ast_channel::name, tonepair_release(), tonepair_def::vol, and ast_channel::writeformat.

04372 {
04373    struct tonepair_state *ts;
04374    struct tonepair_def *td = params;
04375 
04376    if (!(ts = ast_calloc(1, sizeof(*ts))))
04377       return NULL;
04378    ts->origwfmt = chan->writeformat;
04379    if (ast_set_write_format(chan, AST_FORMAT_SLINEAR)) {
04380       ast_log(LOG_WARNING, "Unable to set '%s' to signed linear format (write)\n", chan->name);
04381       tonepair_release(NULL, ts);
04382       ts = NULL;
04383    } else {
04384       ts->fac1 = 2.0 * cos(2.0 * M_PI * (td->freq1 / 8000.0)) * 32768.0;
04385       ts->v1_1 = 0;
04386       ts->v2_1 = sin(-4.0 * M_PI * (td->freq1 / 8000.0)) * td->vol;
04387       ts->v3_1 = sin(-2.0 * M_PI * (td->freq1 / 8000.0)) * td->vol;
04388       ts->v2_1 = 0;
04389       ts->fac2 = 2.0 * cos(2.0 * M_PI * (td->freq2 / 8000.0)) * 32768.0;
04390       ts->v2_2 = sin(-4.0 * M_PI * (td->freq2 / 8000.0)) * td->vol;
04391       ts->v3_2 = sin(-2.0 * M_PI * (td->freq2 / 8000.0)) * td->vol;
04392       ts->duration = td->duration;
04393       ts->modulate = 0;
04394    }
04395    /* Let interrupts interrupt :) */
04396    ast_set_flag(chan, AST_FLAG_WRITE_INT);
04397    return ts;
04398 }

static int tonepair_generator ( struct ast_channel chan,
void *  data,
int  len,
int  samples 
) [static]

Definition at line 4400 of file channel.c.

References ast_log(), tonepair_state::data, tonepair_state::f, tonepair_state::fac1, tonepair_state::fac2, tonepair_state::modulate, tonepair_state::v1_1, tonepair_state::v1_2, tonepair_state::v2_1, tonepair_state::v2_2, tonepair_state::v3_1, and tonepair_state::v3_2.

04401 {
04402    struct tonepair_state *ts = data;
04403    int x;
04404 
04405    /* we need to prepare a frame with 16 * timelen samples as we're
04406     * generating SLIN audio
04407     */
04408    len = samples * 2;
04409 
04410    if (len > sizeof(ts->data) / 2 - 1) {
04411       ast_log(LOG_WARNING, "Can't generate that much data!\n");
04412       return -1;
04413    }
04414    memset(&ts->f, 0, sizeof(ts->f));
04415    for (x=0;x<len/2;x++) {
04416       ts->v1_1 = ts->v2_1;
04417       ts->v2_1 = ts->v3_1;
04418       ts->v3_1 = (ts->fac1 * ts->v2_1 >> 15) - ts->v1_1;
04419       
04420       ts->v1_2 = ts->v2_2;
04421       ts->v2_2 = ts->v3_2;
04422       ts->v3_2 = (ts->fac2 * ts->v2_2 >> 15) - ts->v1_2;
04423       if (ts->modulate) {
04424          int p;
04425          p = ts->v3_2 - 32768;
04426          if (p < 0) p = -p;
04427          p = ((p * 9) / 10) + 1;
04428          ts->data[x] = (ts->v3_1 * p) >> 15;
04429       } else
04430          ts->data[x] = ts->v3_1 + ts->v3_2; 
04431    }
04432    ts->f.frametype = AST_FRAME_VOICE;
04433    ts->f.subclass = AST_FORMAT_SLINEAR;
04434    ts->f.datalen = len;
04435    ts->f.samples = samples;
04436    ts->f.offset = AST_FRIENDLY_OFFSET;
04437    ts->f.data = ts->data;
04438    ast_write(chan, &ts->f);
04439    ts->pos += x;
04440    if (ts->duration > 0) {
04441       if (ts->pos >= ts->duration * 8)
04442          return -1;
04443    }
04444    return 0;
04445 }

static void tonepair_release ( struct ast_channel chan,
void *  params 
) [static]

Definition at line 4362 of file channel.c.

References ast_set_write_format(), free, and tonepair_state::origwfmt.

Referenced by tonepair_alloc().

04363 {
04364    struct tonepair_state *ts = params;
04365 
04366    if (chan)
04367       ast_set_write_format(chan, ts->origwfmt);
04368    free(ts);
04369 }


Variable Documentation

void(*) ast_moh_cleanup_ptr(struct ast_channel *) = NULL [static]

Definition at line 4523 of file channel.c.

Referenced by ast_install_music_functions(), ast_moh_cleanup(), and ast_uninstall_music_functions().

int(*) ast_moh_start_ptr(struct ast_channel *, const char *, const char *) = NULL [static]

Definition at line 4521 of file channel.c.

Referenced by ast_install_music_functions(), ast_moh_start(), and ast_uninstall_music_functions().

void(*) ast_moh_stop_ptr(struct ast_channel *) = NULL [static]

Definition at line 4522 of file channel.c.

Referenced by ast_install_music_functions(), ast_moh_stop(), and ast_uninstall_music_functions().

struct ast_cause causes[]

map AST_CAUSE's to readable string representations

Referenced by ast_cause2str(), ast_str2cause(), and dump_cause().

struct ast_cli_entry cli_channel[] [static]

Definition at line 374 of file channel.c.

Referenced by ast_channels_init().

struct ast_cli_entry cli_show_channeltype_deprecated [static]

Initial value:

 {
   { "show", "channeltype", NULL },
   show_channeltype_deprecated, NULL,
   NULL, complete_channeltypes_deprecated }

Definition at line 369 of file channel.c.

struct ast_cli_entry cli_show_channeltypes_deprecated [static]

Initial value:

 {
   { "show", "channeltypes", NULL },
   show_channeltypes, NULL,
   NULL }

Definition at line 364 of file channel.c.

unsigned long global_fin

Definition at line 82 of file channel.c.

unsigned long global_fout

Definition at line 82 of file channel.c.

struct ast_channel_tech null_tech [static]

Initial value:

 {
   .type = "NULL",
   .description = "Null channel (should not see this)",
}

Definition at line 703 of file channel.c.

char show_channeltype_usage[] [static]

Initial value:

"Usage: core show channeltype <name>\n"
"  Show details about the specified channel type, <name>.\n"

Definition at line 360 of file channel.c.

char show_channeltypes_usage[] [static]

Initial value:

"Usage: core show channeltypes\n"
"       Lists available channel types registered in your Asterisk server.\n"

Definition at line 356 of file channel.c.

int shutting_down [static]

Prevent new channel allocation if shutting down.

Definition at line 78 of file channel.c.

struct ast_generator silence_generator [static]

Initial value:

Definition at line 4634 of file channel.c.

Referenced by ast_channel_start_silence_generator().

struct ast_threadstorage state2str_threadbuf = { .once = PTHREAD_ONCE_INIT , .key_init = state2str_threadbuf_init , } [static]

Definition at line 84 of file channel.c.

Referenced by ast_state2str().

struct ast_generator tonepair [static]

Initial value:

 {
   alloc: tonepair_alloc,
   release: tonepair_release,
   generate: tonepair_generator,
}

Definition at line 4447 of file channel.c.

Referenced by ast_tonepair_start().

int uniqueint [static]

Definition at line 80 of file channel.c.


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