Mon Oct 8 12:39:11 2012

Asterisk developer's documentation


autochan.c File Reference

"smart" channels More...

#include "asterisk.h"
#include "asterisk/autochan.h"
#include "asterisk/utils.h"
#include "asterisk/linkedlists.h"
#include "asterisk/options.h"
#include "asterisk/channel.h"

Go to the source code of this file.

Functions

void ast_autochan_destroy (struct ast_autochan *autochan)
 destroy an ast_autochan structure
void ast_autochan_new_channel (struct ast_channel *old_chan, struct ast_channel *new_chan)
 Switch what channel autochans point to.
ast_autochanast_autochan_setup (struct ast_channel *chan)
 set up a new ast_autochan structure


Detailed Description

"smart" channels

Author:
Mark Michelson <mmichelson@digium.com>

Definition in file autochan.c.


Function Documentation

void ast_autochan_destroy ( struct ast_autochan autochan  ) 

destroy an ast_autochan structure

Removes the passed-in autochan from the list of autochans and unrefs the channel that is pointed to. Also frees the autochan struct itself. This function will unref the channel reference which was made in ast_autochan_setup

Parameters:
autochan The autochan that you wish to destroy
Return values:
void 

Definition at line 63 of file autochan.c.

References ast_channel_lock, ast_channel_unlock, ast_channel_unref, ast_debug, ast_free, AST_LIST_REMOVE_CURRENT, AST_LIST_TRAVERSE_SAFE_BEGIN, AST_LIST_TRAVERSE_SAFE_END, ast_channel::autochans, ast_autochan::chan, and ast_autochan::list.

Referenced by channel_spy(), common_exec(), launch_monitor_thread(), and mixmonitor_thread().

00064 {
00065    struct ast_autochan *autochan_iter;
00066 
00067    ast_channel_lock(autochan->chan);
00068    AST_LIST_TRAVERSE_SAFE_BEGIN(&autochan->chan->autochans, autochan_iter, list) {
00069       if (autochan_iter == autochan) {
00070          AST_LIST_REMOVE_CURRENT(list);
00071          ast_debug(1, "Removed autochan %p from the list, about to free it\n", autochan);
00072          break;
00073       }
00074    }
00075    AST_LIST_TRAVERSE_SAFE_END;
00076    ast_channel_unlock(autochan->chan);
00077 
00078    autochan->chan = ast_channel_unref(autochan->chan);
00079 
00080    ast_free(autochan);
00081 }

void ast_autochan_new_channel ( struct ast_channel old_chan,
struct ast_channel new_chan 
)

Switch what channel autochans point to.

Traverses the list of autochans. All autochans which point to old_chan will be updated to point to new_chan instead. Currently this is only called from ast_do_masquerade in channel.c.

Precondition:
Both channels must be locked before calling this function.
Parameters:
old_chan The channel that autochans may currently point to
new_chan The channel that we want to point those autochans to now
Return values:
void 

Definition at line 83 of file autochan.c.

References ast_channel_ref, ast_channel_unref, ast_debug, AST_LIST_APPEND_LIST, AST_LIST_TRAVERSE, ast_channel::autochans, ast_autochan::chan, ast_autochan::list, and ast_channel::name.

Referenced by ast_do_masquerade().

00084 {
00085    struct ast_autochan *autochan;
00086 
00087    AST_LIST_APPEND_LIST(&new_chan->autochans, &old_chan->autochans, list);
00088 
00089    AST_LIST_TRAVERSE(&new_chan->autochans, autochan, list) {
00090       if (autochan->chan == old_chan) {
00091          autochan->chan = ast_channel_unref(old_chan);
00092          autochan->chan = ast_channel_ref(new_chan);
00093 
00094          ast_debug(1, "Autochan %p used to hold channel %s (%p) but now holds channel %s (%p)\n",
00095                autochan, old_chan->name, old_chan, new_chan->name, new_chan);
00096       }
00097    }
00098 }

struct ast_autochan* ast_autochan_setup ( struct ast_channel chan  ) 

set up a new ast_autochan structure

Allocates and initializes an ast_autochan, sets the autochan's chan pointer to point to the chan parameter, and adds the autochan to the global list of autochans. The newly- created autochan is returned to the caller. This function will cause the refcount of chan to increase by 1.

Parameters:
chan The channel our new autochan will point to
Note:
autochans must be freed using ast_autochan_destroy
Return values:
NULL Failure
non-NULL success

Definition at line 40 of file autochan.c.

References ast_calloc, ast_channel_lock, ast_channel_ref, ast_channel_unlock, ast_debug, AST_LIST_INSERT_TAIL, ast_autochan::chan, ast_autochan::list, and ast_channel::name.

Referenced by channel_spy(), common_exec(), launch_monitor_thread(), and next_channel().

00041 {
00042    struct ast_autochan *autochan;
00043 
00044    if (!chan) {
00045       return NULL;
00046    }
00047 
00048    if (!(autochan = ast_calloc(1, sizeof(*autochan)))) {
00049       return NULL;
00050    }
00051 
00052    autochan->chan = ast_channel_ref(chan);
00053 
00054    ast_channel_lock(autochan->chan);
00055    AST_LIST_INSERT_TAIL(&autochan->chan->autochans, autochan, list);
00056    ast_channel_unlock(autochan->chan);
00057 
00058    ast_debug(1, "Created autochan %p to hold channel %s (%p)\n", autochan, chan->name, chan);
00059 
00060    return autochan;
00061 }


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