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    /*
    
     * Asterisk -- An open source telephony toolkit.
    
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     *
    
     * Copyright (C) 1999 - 2005, Digium, Inc.
     *
     * Mark Spencer <markster@digium.com>
    
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     *
    
     * 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.
    
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     *
     * 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.
     */
    
    /*
     *
     * App to flash a zap trunk
     * 
    
    #include <string.h>
    #include <errno.h>
    #include <stdlib.h>
    
    #include <sys/ioctl.h>
    #ifdef __linux__
    #include <linux/zaptel.h>
    #else
    #include <zaptel.h>
    #endif /* __linux__ */
    
    #include "asterisk.h"
    
    ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
    
    
    #include "asterisk/lock.h"
    #include "asterisk/file.h"
    #include "asterisk/logger.h"
    #include "asterisk/channel.h"
    #include "asterisk/pbx.h"
    #include "asterisk/module.h"
    #include "asterisk/translate.h"
    #include "asterisk/image.h"
    #include "asterisk/options.h"
    
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    static char *tdesc = "Flash zap trunk application";
    
    static char *app = "Flash";
    
    static char *synopsis = "Flashes a Zap Trunk";
    
    static char *descrip = 
    "  Flash(): Sends a flash on a zap trunk.  This is only a hack for\n"
    "people who want to perform transfers and such via AGI and is generally\n"
    "quite useless otherwise.  Returns 0 on success or -1 if this is not\n"
    "a zap trunk\n";
    
    STANDARD_LOCAL_USER;
    
    LOCAL_USER_DECL;
    
    static inline int zt_wait_event(int fd)
    {
    	/* Avoid the silly zt_waitevent which ignores a bunch of events */
    	int i,j=0;
    	i = ZT_IOMUX_SIGEVENT;
    	if (ioctl(fd, ZT_IOMUX, &i) == -1) return -1;
    	if (ioctl(fd, ZT_GETEVENT, &j) == -1) return -1;
    	return j;
    }
    
    static int flash_exec(struct ast_channel *chan, void *data)
    {
    	int res = -1;
    	int x;
    	struct localuser *u;
    	struct zt_params ztp;
    	LOCAL_USER_ADD(u);
    	if (!strcasecmp(chan->type, "Zap")) {
    		memset(&ztp, 0, sizeof(ztp));
    		res = ioctl(chan->fds[0], ZT_GET_PARAMS, &ztp);
    		if (!res) {
    			if (ztp.sigtype & __ZT_SIG_FXS) {
    				x = ZT_FLASH;
    				res = ioctl(chan->fds[0], ZT_HOOK, &x);
    				if (!res || (errno == EINPROGRESS)) {
    					if (res) {
    						/* Wait for the event to finish */
    						zt_wait_event(chan->fds[0]);
    					}
    					res = ast_safe_sleep(chan, 1000);
    					if (option_verbose > 2)
    						ast_verbose(VERBOSE_PREFIX_3 "Flashed channel %s\n", chan->name);
    				} else
    					ast_log(LOG_WARNING, "Unable to flash channel %s: %s\n", chan->name, strerror(errno));
    			} else
    				ast_log(LOG_WARNING, "%s is not an FXO Channel\n", chan->name);
    		} else
    			ast_log(LOG_WARNING, "Unable to get parameters of %s: %s\n", chan->name, strerror(errno));
    	} else
    		ast_log(LOG_WARNING, "%s is not a Zap channel\n", chan->name);
    	LOCAL_USER_REMOVE(u);
    	return res;
    }
    
    int unload_module(void)
    {
    
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    	STANDARD_HANGUP_LOCALUSERS;
    
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    }
    
    int load_module(void)
    {
    	return ast_register_application(app, flash_exec, synopsis, descrip);
    }
    
    char *description(void)
    {
    	return tdesc;
    }
    
    int usecount(void)
    {
    	int res;
    	STANDARD_USECOUNT(res);
    	return res;
    }
    
    char *key()
    {
    	return ASTERISK_GPL_KEY;
    }