mirror of
https://github.com/sheumann/hush.git
synced 2024-12-21 23:29:34 +00:00
72 lines
1.7 KiB
C
72 lines
1.7 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Mini watchdog implementation for busybox
|
|
*
|
|
* Copyright (C) 2003 Paul Mundt <lethal@linux-sh.org>
|
|
* Copyright (C) 2006 Bernhard Fischer <busybox@busybox.net>
|
|
*
|
|
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
|
|
*/
|
|
|
|
#include "libbb.h"
|
|
|
|
#define OPT_FOREGROUND 0x01
|
|
#define OPT_TIMER 0x02
|
|
|
|
static void watchdog_shutdown(int sig UNUSED_PARAM)
|
|
{
|
|
static const char V = 'V';
|
|
|
|
write(3, &V, 1); /* Magic, see watchdog-api.txt in kernel */
|
|
if (ENABLE_FEATURE_CLEAN_UP)
|
|
close(3);
|
|
exit(EXIT_SUCCESS);
|
|
}
|
|
|
|
int watchdog_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int watchdog_main(int argc, char **argv)
|
|
{
|
|
unsigned opts;
|
|
unsigned timer_duration = 30000; /* Userspace timer duration, in milliseconds */
|
|
char *t_arg;
|
|
|
|
opt_complementary = "=1"; /* must have 1 argument */
|
|
opts = getopt32(argv, "Ft:", &t_arg);
|
|
|
|
if (opts & OPT_TIMER) {
|
|
static const struct suffix_mult suffixes[] = {
|
|
{ "ms", 1 },
|
|
{ "", 1000 },
|
|
{ }
|
|
};
|
|
timer_duration = xatou_sfx(t_arg, suffixes);
|
|
}
|
|
|
|
if (!(opts & OPT_FOREGROUND)) {
|
|
bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
|
|
}
|
|
|
|
bb_signals(BB_FATAL_SIGS, watchdog_shutdown);
|
|
|
|
/* Use known fd # - avoid needing global 'int fd' */
|
|
xmove_fd(xopen(argv[argc - 1], O_WRONLY), 3);
|
|
|
|
// TODO?
|
|
// if (!(opts & OPT_TIMER)) {
|
|
// if (ioctl(fd, WDIOC_GETTIMEOUT, &timer_duration) == 0)
|
|
// timer_duration *= 500;
|
|
// else
|
|
// timer_duration = 30000;
|
|
// }
|
|
|
|
while (1) {
|
|
/*
|
|
* Make sure we clear the counter before sleeping, as the counter value
|
|
* is undefined at this point -- PFM
|
|
*/
|
|
write(3, "", 1); /* write zero byte */
|
|
usleep(timer_duration * 1000L);
|
|
}
|
|
return EXIT_SUCCESS; /* - not reached, but gcc 4.2.1 is too dumb! */
|
|
}
|