app_flash.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2005, 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 App to flash a DAHDI trunk
 *
 * \author Mark Spencer <markster@digium.com>
 *
 * \ingroup applications
 */
 
/*** MODULEINFO
    <depend>dahdi</depend>
    <support_level>core</support_level>
 ***/
 
#include "asterisk.h"
 
#include <dahdi/user.h>
 
#include "asterisk/lock.h"
#include "asterisk/file.h"
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/module.h"
#include "asterisk/translate.h"
#include "asterisk/image.h"
 
/*** DOCUMENTATION
    <application name="Flash" language="en_US">
        <synopsis>
            Flashes a DAHDI Trunk.
        </synopsis>
        <syntax />
        <description>
            <para>Performs a flash on a DAHDI trunk. This can be used to access features
            provided on an incoming analogue circuit such as conference and call waiting.
            Use with SendDTMF() to perform external transfers.</para>
        </description>
        <see-also>
            <ref type="application">SendDTMF</ref>
        </see-also>
    </application>
 ***/
 
static char *app = "Flash";
 
static inline int dahdi_wait_event(int fd)
{
    /* Avoid the silly dahdi_waitevent which ignores a bunch of events */
    int i,j=0;
    i = DAHDI_IOMUX_SIGEVENT;
    if (ioctl(fd, DAHDI_IOMUX, &i) == -1) return -1;
    if (ioctl(fd, DAHDI_GETEVENT, &j) == -1) return -1;
    return j;
}
 
static int flash_exec(struct ast_channel *chan, const char *data)
{
    int res = -1;
    int x;
    struct dahdi_params dahdip;
 
    if (strcasecmp(ast_channel_tech(chan)->type, "DAHDI")) {
        ast_log(LOG_WARNING, "%s is not a DAHDI channel\n", ast_channel_name(chan));
        return -1;
    }
 
    memset(&dahdip, 0, sizeof(dahdip));
    res = ioctl(ast_channel_fd(chan, 0), DAHDI_GET_PARAMS, &dahdip);
    if (!res) {
        if (dahdip.sigtype & __DAHDI_SIG_FXS) {
            x = DAHDI_FLASH;
            res = ioctl(ast_channel_fd(chan, 0), DAHDI_HOOK, &x);
            if (!res || (errno == EINPROGRESS)) {
                if (res) {
                    /* Wait for the event to finish */
                    dahdi_wait_event(ast_channel_fd(chan, 0));
                }
                res = ast_safe_sleep(chan, 1000);
                ast_verb(3, "Flashed channel %s\n", ast_channel_name(chan));
            } else
                ast_log(LOG_WARNING, "Unable to flash channel %s: %s\n", ast_channel_name(chan), strerror(errno));
        } else
            ast_log(LOG_WARNING, "%s is not an FXO Channel\n", ast_channel_name(chan));
    } else
        ast_log(LOG_WARNING, "Unable to get parameters of %s: %s\n", ast_channel_name(chan), strerror(errno));
 
    return res;
}
 
static int unload_module(void)
{
    return ast_unregister_application(app);
}
 
static int load_module(void)
{
    return ast_register_application_xml(app, flash_exec);
}
 
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Flash channel application");