Wed Apr 6 11:30:09 2011

Asterisk developer's documentation


res_timing_dahdi.c File Reference

DAHDI timing interface. More...

#include "asterisk.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <math.h>
#include <dahdi/user.h>
#include "asterisk/module.h"
#include "asterisk/timing.h"
#include "asterisk/utils.h"

Go to the source code of this file.

Defines

#define SEE_TIMING   "For more information on Asterisk timing modules, including ways to potentially fix this problem, please see doc/timing.txt\n"

Functions

static void __reg_module (void)
static void __unreg_module (void)
 ASTERISK_FILE_VERSION (__FILE__,"$Revision: 278132 $")
static int dahdi_test_timer (void)
static void dahdi_timer_ack (int handle, unsigned int quantity)
static void dahdi_timer_close (int handle)
static int dahdi_timer_disable_continuous (int handle)
static int dahdi_timer_enable_continuous (int handle)
static enum ast_timer_event dahdi_timer_get_event (int handle)
static unsigned int dahdi_timer_get_max_rate (int handle)
static int dahdi_timer_open (void)
static int dahdi_timer_set_rate (int handle, unsigned int rate)
static int load_module (void)
static int unload_module (void)

Variables

static struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "DAHDI Timing Interface" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = "8586c2a7d357cb591cc3a6607a8f62d1" , .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_CHANNEL_DEPEND, }
static struct ast_module_infoast_module_info = &__mod_info
static struct ast_timing_interface dahdi_timing
static void * timing_funcs_handle


Detailed Description

DAHDI timing interface.

Author:
Russell Bryant <russell@digium.com>

Definition in file res_timing_dahdi.c.


Define Documentation

#define SEE_TIMING   "For more information on Asterisk timing modules, including ways to potentially fix this problem, please see doc/timing.txt\n"

Definition at line 140 of file res_timing_dahdi.c.

Referenced by dahdi_test_timer().


Function Documentation

static void __reg_module ( void   )  [static]

Definition at line 206 of file res_timing_dahdi.c.

static void __unreg_module ( void   )  [static]

Definition at line 206 of file res_timing_dahdi.c.

ASTERISK_FILE_VERSION ( __FILE__  ,
"$Revision: 278132 $"   
)

static int dahdi_test_timer ( void   )  [static]

Definition at line 142 of file res_timing_dahdi.c.

References ast_log(), ast_wait_for_input(), LOG_ERROR, and SEE_TIMING.

Referenced by load_module().

00143 {
00144    int fd;
00145    int x = 160;
00146    
00147    fd = open("/dev/dahdi/timer", O_RDWR);
00148 
00149    if (fd < 0) {
00150       return -1;
00151    }
00152 
00153    if (ioctl(fd, DAHDI_TIMERCONFIG, &x)) {
00154       ast_log(LOG_ERROR, "You have DAHDI built and drivers loaded, but the DAHDI timer test failed to set DAHDI_TIMERCONFIG to %d.\n" SEE_TIMING, x);
00155       close(fd);
00156       return -1;
00157    }
00158 
00159    if ((x = ast_wait_for_input(fd, 300)) < 0) {
00160       ast_log(LOG_ERROR, "You have DAHDI built and drivers loaded, but the DAHDI timer could not be polled during the DAHDI timer test.\n" SEE_TIMING);
00161       close(fd);
00162       return -1;
00163    }
00164 
00165    if (!x) {
00166       const char dahdi_timer_error[] = {
00167          "Asterisk has detected a problem with your DAHDI configuration and will shutdown for your protection.  You have options:"
00168          "\n\t1. You only have to compile DAHDI support into Asterisk if you need it.  One option is to recompile without DAHDI support."
00169          "\n\t2. You only have to load DAHDI drivers if you want to take advantage of DAHDI services.  One option is to unload DAHDI modules if you don't need them."
00170          "\n\t3. If you need DAHDI services, you must correctly configure DAHDI."
00171       };
00172       ast_log(LOG_ERROR, "%s\n" SEE_TIMING, dahdi_timer_error);
00173       usleep(100);
00174       close(fd);
00175       return -1;
00176    }
00177 
00178    close(fd);
00179 
00180    return 0;
00181 }

static void dahdi_timer_ack ( int  handle,
unsigned int  quantity 
) [static]

Definition at line 96 of file res_timing_dahdi.c.

00097 {
00098    ioctl(handle, DAHDI_TIMERACK, &quantity);
00099 }

static void dahdi_timer_close ( int  handle  )  [static]

Definition at line 74 of file res_timing_dahdi.c.

00075 {
00076    close(handle);
00077 }

static int dahdi_timer_disable_continuous ( int  handle  )  [static]

Definition at line 108 of file res_timing_dahdi.c.

00109 {
00110    int flags = -1;
00111 
00112    return ioctl(handle, DAHDI_TIMERPONG, &flags) ? -1 : 0;
00113 }

static int dahdi_timer_enable_continuous ( int  handle  )  [static]

Definition at line 101 of file res_timing_dahdi.c.

00102 {
00103    int flags = 1;
00104 
00105    return ioctl(handle, DAHDI_TIMERPING, &flags) ? -1 : 0;
00106 }

static enum ast_timer_event dahdi_timer_get_event ( int  handle  )  [static]

Definition at line 115 of file res_timing_dahdi.c.

References AST_TIMING_EVENT_CONTINUOUS, and AST_TIMING_EVENT_EXPIRED.

00116 {
00117    int res;
00118    int event;
00119 
00120    res = ioctl(handle, DAHDI_GETEVENT, &event);
00121 
00122    if (res) {
00123       event = DAHDI_EVENT_TIMER_EXPIRED;
00124    }
00125 
00126    switch (event) {
00127    case DAHDI_EVENT_TIMER_PING:
00128       return AST_TIMING_EVENT_CONTINUOUS;
00129    case DAHDI_EVENT_TIMER_EXPIRED:
00130    default:
00131       return AST_TIMING_EVENT_EXPIRED; 
00132    }
00133 }

static unsigned int dahdi_timer_get_max_rate ( int  handle  )  [static]

Definition at line 135 of file res_timing_dahdi.c.

00136 {
00137    return 1000;
00138 }

static int dahdi_timer_open ( void   )  [static]

Definition at line 69 of file res_timing_dahdi.c.

00070 {
00071    return open("/dev/dahdi/timer", O_RDWR);
00072 }

static int dahdi_timer_set_rate ( int  handle,
unsigned int  rate 
) [static]

Definition at line 79 of file res_timing_dahdi.c.

References ast_log(), and LOG_ERROR.

00080 {
00081    int samples;
00082 
00083    /* DAHDI timers are configured using a number of samples,
00084     * based on an 8 kHz sample rate. */
00085    samples = (unsigned int) roundf((8000.0 / ((float) rate)));
00086 
00087    if (ioctl(handle, DAHDI_TIMERCONFIG, &samples)) {
00088       ast_log(LOG_ERROR, "Failed to configure DAHDI timing fd for %u sample timer ticks\n",
00089          samples);
00090       return -1;
00091    }
00092 
00093    return 0;
00094 }

static int load_module ( void   )  [static]

Definition at line 183 of file res_timing_dahdi.c.

References AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_SUCCESS, ast_register_timing_interface, dahdi_test_timer(), dahdi_timing, and timing_funcs_handle.

static int unload_module ( void   )  [static]

Definition at line 193 of file res_timing_dahdi.c.

References ast_unregister_timing_interface(), and timing_funcs_handle.

00194 {
00195    if (timing_funcs_handle) {
00196       return ast_unregister_timing_interface(timing_funcs_handle);
00197    }
00198 
00199    return 0;
00200 }


Variable Documentation

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "DAHDI Timing Interface" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = "8586c2a7d357cb591cc3a6607a8f62d1" , .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_CHANNEL_DEPEND, } [static]

Definition at line 206 of file res_timing_dahdi.c.

struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 206 of file res_timing_dahdi.c.

struct ast_timing_interface dahdi_timing [static]

Definition at line 56 of file res_timing_dahdi.c.

Referenced by load_module().

void* timing_funcs_handle [static]

Definition at line 45 of file res_timing_dahdi.c.

Referenced by load_module(), and unload_module().


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