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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__, "$Revision$")
#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], *chan;
struct asent *as;
int x = 0, ms = 500;
AST_RWLIST_RDLOCK(&aslist);
AST_RWLIST_TRAVERSE(&aslist, as, list) {
if (!ast_check_hangup(as->chan)) {
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);
if ((chan = ast_waitfor_n(mons, x, &ms))) {
/* 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);
ast_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(list);
ast_free(as);
if (!ast_check_hangup(chan))
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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