app_chanisavail.c File Reference

Check if Channel is Available. More...

#include "asterisk.h"
#include <sys/ioctl.h>
#include "asterisk/lock.h"
#include "asterisk/file.h"
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/module.h"
#include "asterisk/app.h"
#include "asterisk/devicestate.h"

Include dependency graph for app_chanisavail.c:

Go to the source code of this file.

Functions
static void	__reg_module (void)
static void	__unreg_module (void)
static int	chanavail_exec (struct ast_channel *chan, void *data)
static int	load_module (void)
static int	unload_module (void)
Variables
static struct ast_module_info	__mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "Check channel availability" , .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 = "0901e4e500243c855563a2d78b0c03e4" , .load = load_module, .unload = unload_module, }
static char *	app = "ChanIsAvail"
static struct ast_module_info *	ast_module_info = &__mod_info

---

Detailed Description

Check if Channel is Available.

Author:

Mark Spencer <markster@digium.com>

James Golovich <james@gnuinter.net>

Definition in file app_chanisavail.c.

---

Function Documentation

static void __reg_module

(

void

)

[static]

Definition at line 206 of file app_chanisavail.c.

static void __unreg_module

(

void

)

[static]

Definition at line 206 of file app_chanisavail.c.

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

Definition at line 97 of file app_chanisavail.c.

References AST_APP_ARG, AST_DECLARE_APP_ARGS, ast_hangup(), ast_log(), ast_parse_device_state(), ast_request(), AST_STANDARD_APP_ARGS, ast_str_alloca, ast_str_append(), ast_str_buffer(), ast_str_strlen(), ast_strlen_zero(), inuse, LOG_WARNING, ast_channel::name, ast_channel::nativeformats, pbx_builtin_setvar_helper(), and status.

Referenced by load_module().

{
   int inuse=-1, option_state=0, string_compare=0, option_all_avail=0;
   int status;
   char *info, tmp[512], trychan[512], *peers, *tech, *number, *rest, *cur;
   struct ast_str *tmp_availchan = ast_str_alloca(2048);
   struct ast_str *tmp_availorig = ast_str_alloca(2048);
   struct ast_str *tmp_availstat = ast_str_alloca(2048);
   struct ast_channel *tempchan;
   AST_DECLARE_APP_ARGS(args,
      AST_APP_ARG(reqchans);
      AST_APP_ARG(options);
   );

   if (ast_strlen_zero(data)) {
      ast_log(LOG_WARNING, "ChanIsAvail requires an argument (DAHDI/1&DAHDI/2)\n");
      return -1;
   }

   info = ast_strdupa(data);

   AST_STANDARD_APP_ARGS(args, info);

   if (args.options) {
      if (strchr(args.options, 'a')) {
         option_all_avail = 1;
      }
      if (strchr(args.options, 's')) {
         option_state = 1;
      }
      if (strchr(args.options, 't')) {
         string_compare = 1;
      }
   }
   peers = args.reqchans;
   if (peers) {
      cur = peers;
      do {
         /* remember where to start next time */
         rest = strchr(cur, '&');
         if (rest) {
            *rest = 0;
            rest++;
         }
         tech = cur;
         number = strchr(tech, '/');
         if (!number) {
            ast_log(LOG_WARNING, "ChanIsAvail argument takes format ([technology]/[device])\n");
            return -1;
         }
         *number = '\0';
         number++;
         
         if (string_compare) {
            /* ast_parse_device_state checks for "SIP/1234" as a channel name.
               ast_device_state will ask the SIP driver for the channel state. */

            snprintf(trychan, sizeof(trychan), "%s/%s",cur,number);
            status = inuse = ast_parse_device_state(trychan);
         } else if (option_state) {
            /* If the pbx says in use then don't bother trying further.
               This is to permit testing if someone's on a call, even if the
               channel can permit more calls (ie callwaiting, sip calls, etc).  */

            snprintf(trychan, sizeof(trychan), "%s/%s",cur,number);
            status = inuse = ast_device_state(trychan);
         }
         if ((inuse <= 1) && (tempchan = ast_request(tech, chan->nativeformats, number, &status))) {
               ast_str_append(&tmp_availchan, 0, "%s%s", ast_str_strlen(tmp_availchan) ? "&" : "", tempchan->name);
               
               snprintf(tmp, sizeof(tmp), "%s/%s", tech, number);
               ast_str_append(&tmp_availorig, 0, "%s%s", ast_str_strlen(tmp_availorig) ? "&" : "", tmp);

               snprintf(tmp, sizeof(tmp), "%d", status);
               ast_str_append(&tmp_availstat, 0, "%s%s", ast_str_strlen(tmp_availstat) ? "&" : "", tmp);

               ast_hangup(tempchan);
               tempchan = NULL;

               if (!option_all_avail) {
                  break;
               }
         } else {
            snprintf(tmp, sizeof(tmp), "%d", status);
            ast_str_append(&tmp_availstat, 0, "%s%s", ast_str_strlen(tmp_availstat) ? "&" : "", tmp);
         }
         cur = rest;
      } while (cur);
   }

   pbx_builtin_setvar_helper(chan, "AVAILCHAN", ast_str_buffer(tmp_availchan));
   /* Store the originally used channel too */
   pbx_builtin_setvar_helper(chan, "AVAILORIGCHAN", ast_str_buffer(tmp_availorig));
   pbx_builtin_setvar_helper(chan, "AVAILSTATUS", ast_str_buffer(tmp_availstat));

   return 0;
}

static int load_module

(

void

)

[static]

Definition at line 200 of file app_chanisavail.c.

References AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_SUCCESS, ast_register_application_xml, and chanavail_exec().

{
   return ast_register_application_xml(app, chanavail_exec) ?
      AST_MODULE_LOAD_DECLINE : AST_MODULE_LOAD_SUCCESS;
}

static int unload_module

(

void

)

[static]

Definition at line 195 of file app_chanisavail.c.

References ast_unregister_application().

{
   return ast_unregister_application(app);
}

---

Variable Documentation

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "Check channel availability" , .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 = "0901e4e500243c855563a2d78b0c03e4" , .load = load_module, .unload = unload_module, } [static]

Definition at line 206 of file app_chanisavail.c.

char* app = "ChanIsAvail" [static]

Definition at line 44 of file app_chanisavail.c.

struct ast_module_info* ast_module_info = &__mod_info [static]

Definition at line 206 of file app_chanisavail.c.