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Asterisk developer's documentation :: Codename Pineapple

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autoservice.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2006, Digium, Inc.
 *
 * Mark Spencer <markster@digium.com>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*! \file
 *
 * \brief Automatic channel service routines
 *
 * \author Mark Spencer <markster@digium.com> 
 */

#include "asterisk.h"

ASTERISK_FILE_VERSION(__FILE__, "$Revision: 51499 $")

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <signal.h>
#include <errno.h>
#include <unistd.h>

#include "asterisk/pbx.h"
#include "asterisk/frame.h"
#include "asterisk/sched.h"
#include "asterisk/options.h"
#include "asterisk/channel.h"
#include "asterisk/logger.h"
#include "asterisk/file.h"
#include "asterisk/translate.h"
#include "asterisk/manager.h"
#include "asterisk/chanvars.h"
#include "asterisk/linkedlists.h"
#include "asterisk/indications.h"
#include "asterisk/lock.h"
#include "asterisk/utils.h"

#define MAX_AUTOMONS 256

struct asent {
   struct ast_channel *chan;
   AST_LIST_ENTRY(asent) list;
};

static AST_RWLIST_HEAD_STATIC(aslist, asent);

static pthread_t asthread = AST_PTHREADT_NULL;

static void *autoservice_run(void *ign)
{

   for (;;) {
      struct ast_channel *mons[MAX_AUTOMONS];
      struct ast_channel *chan;
      struct asent *as;
      int x = 0, ms = 500;

      AST_RWLIST_RDLOCK(&aslist);
      AST_RWLIST_TRAVERSE(&aslist, as, list) {
         if (!as->chan->_softhangup) {
            if (x < MAX_AUTOMONS)
               mons[x++] = as->chan;
            else
               ast_log(LOG_WARNING, "Exceeded maximum number of automatic monitoring events.  Fix autoservice.c\n");
         }
      }
      AST_RWLIST_UNLOCK(&aslist);

      chan = ast_waitfor_n(mons, x, &ms);
      if (chan) {
         /* Read and ignore anything that occurs */
         struct ast_frame *f = ast_read(chan);
         if (f)
            ast_frfree(f);
      }
   }
   asthread = AST_PTHREADT_NULL;
   return NULL;
}

int ast_autoservice_start(struct ast_channel *chan)
{
   int res = -1;
   struct asent *as;

   AST_RWLIST_WRLOCK(&aslist);

   /* Check if the channel already has autoservice */
   AST_RWLIST_TRAVERSE(&aslist, as, list) {
      if (as->chan == chan)
         break;
   }

   /* If not, start autoservice on channel */
   if (!as && (as = ast_calloc(1, sizeof(*as)))) {
      as->chan = chan;
      AST_RWLIST_INSERT_HEAD(&aslist, as, list);
      res = 0;
      if (asthread == AST_PTHREADT_NULL) { /* need start the thread */
         if (ast_pthread_create_background(&asthread, NULL, autoservice_run, NULL)) {
            ast_log(LOG_WARNING, "Unable to create autoservice thread :(\n");
            /* There will only be a single member in the list at this point,
               the one we just added. */
            AST_RWLIST_REMOVE(&aslist, as, list);
            free(as);
            res = -1;
         } else
            pthread_kill(asthread, SIGURG);
      }
   }
   AST_RWLIST_UNLOCK(&aslist);
   return res;
}

int ast_autoservice_stop(struct ast_channel *chan)
{
   int res = -1;
   struct asent *as;

   AST_RWLIST_WRLOCK(&aslist);
   AST_RWLIST_TRAVERSE_SAFE_BEGIN(&aslist, as, list) {   
      if (as->chan == chan) {
         AST_RWLIST_REMOVE_CURRENT(&aslist, list);
         free(as);
         if (!chan->_softhangup)
            res = 0;
         break;
      }
   }
   AST_RWLIST_TRAVERSE_SAFE_END

   if (asthread != AST_PTHREADT_NULL) 
      pthread_kill(asthread, SIGURG);
   AST_RWLIST_UNLOCK(&aslist);

   /* Wait for it to un-block */
   while (ast_test_flag(chan, AST_FLAG_BLOCKING))
      usleep(1000);
   return res;
}

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