1 /* vi: set sw=4 ts=4: */
3 * Mini watchdog implementation for busybox
5 * Copyright (C) 2003 Paul Mundt <lethal@linux-sh.org>
7 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
17 /* Userspace timer duration, in seconds */
18 static unsigned int timer_duration = 30;
20 /* Watchdog file descriptor */
23 static void watchdog_shutdown(int ATTRIBUTE_UNUSED unused)
25 write(fd, "V", 1); /* Magic */
30 int watchdog_main(int argc, char **argv)
35 flags = bb_getopt_ulflags(argc, argv, "t:", &t_arg);
37 timer_duration = bb_xgetlarg(t_arg, 10, 0, INT_MAX);
39 /* We're only interested in the watchdog device .. */
40 if (optind < argc - 1 || argc == 1)
44 bb_perror_msg_and_die("Failed forking watchdog daemon");
46 signal(SIGHUP, watchdog_shutdown);
47 signal(SIGINT, watchdog_shutdown);
49 fd = bb_xopen(argv[argc - 1], O_WRONLY);
53 * Make sure we clear the counter before sleeping, as the counter value
54 * is undefined at this point -- PFM
57 sleep(timer_duration);