139 lines
3.0 KiB
C
139 lines
3.0 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2005, Digium, Inc.
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*
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* Mark Spencer <markster@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \brief Wait for Ring Application
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*
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* \author Mark Spencer <markster@digium.com>
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*
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* \ingroup applications
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*/
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/*** MODULEINFO
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<support_level>extended</support_level>
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***/
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include "asterisk/file.h"
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#include "asterisk/channel.h"
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#include "asterisk/pbx.h"
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#include "asterisk/module.h"
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#include "asterisk/lock.h"
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/*** DOCUMENTATION
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<application name="WaitForRing" language="en_US">
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<synopsis>
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Wait for Ring Application.
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</synopsis>
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<syntax>
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<parameter name="timeout" required="true" />
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</syntax>
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<description>
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<para>Returns <literal>0</literal> after waiting at least <replaceable>timeout</replaceable> seconds,
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and only after the next ring has completed. Returns <literal>0</literal> on success or
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<literal>-1</literal> on hangup.</para>
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</description>
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</application>
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***/
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static char *app = "WaitForRing";
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static int waitforring_exec(struct ast_channel *chan, const char *data)
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{
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struct ast_frame *f;
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struct ast_silence_generator *silgen = NULL;
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int res = 0;
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double s;
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int ms;
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if (!data || (sscanf(data, "%30lg", &s) != 1)) {
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ast_log(LOG_WARNING, "WaitForRing requires an argument (minimum seconds)\n");
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return 0;
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}
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if (ast_opt_transmit_silence) {
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silgen = ast_channel_start_silence_generator(chan);
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}
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ms = s * 1000.0;
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while (ms > 0) {
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ms = ast_waitfor(chan, ms);
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if (ms < 0) {
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res = ms;
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break;
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}
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if (ms > 0) {
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f = ast_read(chan);
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if (!f) {
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res = -1;
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break;
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}
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if ((f->frametype == AST_FRAME_CONTROL) && (f->subclass.integer == AST_CONTROL_RING)) {
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ast_verb(3, "Got a ring but still waiting for timeout\n");
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}
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ast_frfree(f);
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}
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}
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/* Now we're really ready for the ring */
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if (!res) {
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ms = 99999999;
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while(ms > 0) {
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ms = ast_waitfor(chan, ms);
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if (ms < 0) {
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res = ms;
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break;
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}
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if (ms > 0) {
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f = ast_read(chan);
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if (!f) {
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res = -1;
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break;
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}
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if ((f->frametype == AST_FRAME_CONTROL) && (f->subclass.integer == AST_CONTROL_RING)) {
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ast_verb(3, "Got a ring after the timeout\n");
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ast_frfree(f);
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break;
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}
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ast_frfree(f);
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}
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}
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}
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if (silgen) {
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ast_channel_stop_silence_generator(chan, silgen);
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}
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return res;
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}
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static int unload_module(void)
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{
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return ast_unregister_application(app);
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}
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static int load_module(void)
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{
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return ast_register_application_xml(app, waitforring_exec);
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}
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AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Waits until first ring after time");
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