1 /* vi: set sw=4 ts=4: */
3 * Mini watchdog implementation for busybox
5 * Copyright (C) 2003 Paul Mundt <lethal@linux-sh.org>
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.
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.
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
30 /* Userspace timer duration, in seconds */
31 static unsigned int timer_duration = 30;
33 /* Watchdog file descriptor */
36 static void watchdog_shutdown(int unused)
38 write(fd, "V", 1); /* Magic */
43 extern int watchdog_main(int argc, char **argv)
47 while ((opt = getopt(argc, argv, "t:")) > 0) {
50 timer_duration = bb_xgetlarg(optarg, 10, 0, INT_MAX);
57 /* We're only interested in the watchdog device .. */
58 if (optind < argc - 1 || argc == 1)
62 bb_perror_msg_and_die("Failed forking watchdog daemon");
64 signal(SIGHUP, watchdog_shutdown);
65 signal(SIGINT, watchdog_shutdown);
67 fd = bb_xopen(argv[argc - 1], O_WRONLY);
71 * Make sure we clear the counter before sleeping, as the counter value
72 * is undefined at this point -- PFM
75 sleep(timer_duration);