/*
 * play-fifo.c -- A helper app to play a fifo
 * 
 * Copyright (c) 2004-2007 Anthony Minessale II <anthmct@yahoo.com>
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */


#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <poll.h>

/* mutiple of 320 */
#define BUFFER_LEN 32000

int main(int argc, char *argv[]) {
	int fd = 0, res = 0, bytes = 0;
	short buf[BUFFER_LEN];
	char *path;
	struct stat st;
	struct pollfd fds[1];

	if (!(path=argv[1])) {
		path = "/var/run/asterisk/musiconhold.pipe";
	}

	if (stat(path, &st)) {
		if (mkfifo(path, 0)) {
			perror("Error creating FIFO");
		}
	}
	
	if ((fd = open(path, O_RDONLY)) <= 0) {
		perror("Error opening input pipe");
		return -1;
	}

	while(1) {
		fds[0].fd = fd;
		fds[0].events = POLLIN;
		bytes = 0;
		if ((res = poll(fds, 1, BUFFER_LEN / 16)) < 0) {
			perror("No Data\n");
			break;
		} else if (res) {
			if ((bytes = read(fd, buf, BUFFER_LEN)) < 0) {
				perror("No Data\n");
				break;
			} 
		}

		if (!bytes) {
			continue;
		}

		fds[0].fd = STDOUT_FILENO;
		fds[0].events = POLLOUT;		
		res = poll(fds, 1, BUFFER_LEN / 16);

		if (res < 0) {
			perror("No Data\n");
			break;
		} else if (res && bytes) {
			write(STDOUT_FILENO, buf, bytes);
		} /* else it's trash */
	}

	close(fd);
	return 0;
}