source: branches/2.2.2/mindi-busybox/miscutils/watchdog.c @ 1247

Last change on this file since 1247 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 1.5 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Mini watchdog implementation for busybox
4 *
5 * Copyright (C) 2003  Paul Mundt <lethal@linux-sh.org>
6 * Copyright (C) 2006  Bernhard Fischer <busybox@busybox.net>
7 *
8 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
9 */
10
11#include "busybox.h"
12#include <stdio.h>
13#include <fcntl.h>
14#include <unistd.h>
15#include <stdlib.h>
16#include <signal.h>
17
18#define OPT_FOREGROUND 0x01
19#define OPT_TIMER      0x02
20
21/* Watchdog file descriptor */
22static int fd;
23
24static void watchdog_shutdown(int ATTRIBUTE_UNUSED unused)
25{
26    write(fd, "V", 1);  /* Magic, see watchdog-api.txt in kernel */
27    close(fd);
28    exit(0);
29}
30
31int watchdog_main(int argc, char **argv)
32{
33    unsigned long opts;
34    unsigned long timer_duration = 30; /* Userspace timer duration, in seconds */
35    char *t_arg;
36
37    opts = bb_getopt_ulflags(argc, argv, "Ft:", &t_arg);
38
39    if (opts & OPT_TIMER)
40        timer_duration = bb_xgetlarg(t_arg, 10, 0, INT_MAX);
41
42    /* We're only interested in the watchdog device .. */
43    if (optind < argc - 1 || argc == 1)
44        bb_show_usage();
45
46#ifdef BB_NOMMU
47    if (!(opts & OPT_FOREGROUND))
48        vfork_daemon_rexec(0, 1, argc, argv, "-F");
49#else
50    bb_xdaemon(0, 1);
51#endif
52
53    signal(SIGHUP, watchdog_shutdown);
54    signal(SIGINT, watchdog_shutdown);
55
56    fd = bb_xopen(argv[argc - 1], O_WRONLY);
57
58    while (1) {
59        /*
60         * Make sure we clear the counter before sleeping, as the counter value
61         * is undefined at this point -- PFM
62         */
63        write(fd, "\0", 1);
64        sleep(timer_duration);
65    }
66
67    watchdog_shutdown(0);
68
69    return EXIT_SUCCESS;
70}
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