1 /* vi: set sw=4 ts=4: */
3 * Mini watchdog implementation for busybox
5 * Copyright (C) 2003 Paul Mundt <lethal@linux-sh.org>
6 * Copyright (C) 2006 Bernhard Fischer <busybox@busybox.net>
8 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
13 #define OPT_FOREGROUND 0x01
14 #define OPT_TIMER 0x02
16 static void watchdog_shutdown(int ATTRIBUTE_UNUSED sig) ATTRIBUTE_NORETURN;
17 static void watchdog_shutdown(int ATTRIBUTE_UNUSED sig)
19 write(3, "V", 1); /* Magic, see watchdog-api.txt in kernel */
20 if (ENABLE_FEATURE_CLEAN_UP)
25 int watchdog_main(int argc, char **argv);
26 int watchdog_main(int argc, char **argv)
29 unsigned timer_duration = 30; /* Userspace timer duration, in seconds */
32 opt_complementary = "=1"; /* must have 1 argument */
33 opts = getopt32(argv, "Ft:", &t_arg);
36 timer_duration = xatou(t_arg);
38 if (!(opts & OPT_FOREGROUND)) {
39 bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
42 signal(SIGHUP, watchdog_shutdown);
43 signal(SIGINT, watchdog_shutdown);
45 /* Use known fd # - avoid needing global 'int fd' */
46 xmove_fd(xopen(argv[argc - 1], O_WRONLY), 3);
50 * Make sure we clear the counter before sleeping, as the counter value
51 * is undefined at this point -- PFM
54 sleep(timer_duration);
58 /* return EXIT_SUCCESS; */