Единственный watchdog, найденый в исходниках:
Чего он делает я не понял 
wl500g-1.9.2.7-8\busybox-1.1.3\busybox-1.1.3\miscutils
Code:
/* vi: set sw=4 ts=4: */
/*
* Mini watchdog implementation for busybox
*
* Copyright (C) 2003 Paul Mundt <lethal@linux-sh.org>
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
#include "busybox.h"
/* Userspace timer duration, in seconds */
static unsigned int timer_duration = 30;
/* Watchdog file descriptor */
static int fd;
static void watchdog_shutdown(int ATTRIBUTE_UNUSED unused)
{
write(fd, "V", 1); /* Magic */
close(fd);
exit(0);
}
int watchdog_main(int argc, char **argv)
{
char *t_arg;
unsigned long flags;
flags = bb_getopt_ulflags(argc, argv, "t:", &t_arg);
if (flags & 1)
timer_duration = bb_xgetlarg(t_arg, 10, 0, INT_MAX);
/* We're only interested in the watchdog device .. */
if (optind < argc - 1 || argc == 1)
bb_show_usage();
if (daemon(0, 1) < 0)
bb_perror_msg_and_die("Failed forking watchdog daemon");
signal(SIGHUP, watchdog_shutdown);
signal(SIGINT, watchdog_shutdown);
fd = bb_xopen(argv[argc - 1], O_WRONLY);
while (1) {
/*
* Make sure we clear the counter before sleeping, as the counter value
* is undefined at this point -- PFM
*/
write(fd, "\0", 1);
sleep(timer_duration);
}
watchdog_shutdown(0);
return EXIT_SUCCESS;
}
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Originally Posted by khorus
