1/* vi: set sw=4 ts=4: */ 2/* 3 * Mini watchdog implementation for busybox 4 * 5 * Copyright (C) 2000 spoon <spoon@ix.netcom.com>. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 * 21 */ 22 23/* getopt not needed */ 24 25#include <stdio.h> 26#include <fcntl.h> 27#include <unistd.h> 28#include <stdlib.h> 29#include "busybox.h" 30 31extern int watchdog_main(int argc, char **argv) 32{ 33 int fd; 34 35 if (argc != 2) { 36 show_usage(); 37 } 38 39 if ((fd=open(argv[1], O_WRONLY)) == -1) { 40 perror_msg_and_die(argv[1]); 41 } 42 43 while (1) { 44 sleep(30); 45 write(fd, "\0", 1); 46 } 47 48 return EXIT_FAILURE; 49} 50