diff options
Diffstat (limited to 'busybox/miscutils/watchdog.c')
-rw-r--r-- | busybox/miscutils/watchdog.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/busybox/miscutils/watchdog.c b/busybox/miscutils/watchdog.c new file mode 100644 index 000000000..276fadebd --- /dev/null +++ b/busybox/miscutils/watchdog.c | |||
@@ -0,0 +1,81 @@ | |||
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 | * | ||
7 | * This program is free software; you can redistribute it and/or modify | ||
8 | * it under the terms of the GNU General Public License as published by | ||
9 | * the Free Software Foundation; either version 2 of the License, or | ||
10 | * (at your option) any later version. | ||
11 | * | ||
12 | * This program is distributed in the hope that it will be useful, | ||
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
15 | * General Public License for more details. | ||
16 | * | ||
17 | * You should have received a copy of the GNU General Public License | ||
18 | * along with this program; if not, write to the Free Software | ||
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
20 | * | ||
21 | */ | ||
22 | |||
23 | #include <stdio.h> | ||
24 | #include <fcntl.h> | ||
25 | #include <unistd.h> | ||
26 | #include <stdlib.h> | ||
27 | #include <signal.h> | ||
28 | #include "busybox.h" | ||
29 | |||
30 | /* Userspace timer duration, in seconds */ | ||
31 | static unsigned int timer_duration = 30; | ||
32 | |||
33 | /* Watchdog file descriptor */ | ||
34 | static int fd; | ||
35 | |||
36 | static void watchdog_shutdown(int unused) | ||
37 | { | ||
38 | write(fd, "V", 1); /* Magic */ | ||
39 | close(fd); | ||
40 | exit(0); | ||
41 | } | ||
42 | |||
43 | extern int watchdog_main(int argc, char **argv) | ||
44 | { | ||
45 | int opt; | ||
46 | |||
47 | while ((opt = getopt(argc, argv, "t:")) > 0) { | ||
48 | switch (opt) { | ||
49 | case 't': | ||
50 | timer_duration = bb_xgetlarg(optarg, 10, 0, INT_MAX); | ||
51 | break; | ||
52 | default: | ||
53 | bb_show_usage(); | ||
54 | } | ||
55 | } | ||
56 | |||
57 | /* We're only interested in the watchdog device .. */ | ||
58 | if (optind < argc - 1 || argc == 1) | ||
59 | bb_show_usage(); | ||
60 | |||
61 | if (daemon(0, 1) < 0) | ||
62 | bb_perror_msg_and_die("Failed forking watchdog daemon"); | ||
63 | |||
64 | signal(SIGHUP, watchdog_shutdown); | ||
65 | signal(SIGINT, watchdog_shutdown); | ||
66 | |||
67 | fd = bb_xopen(argv[argc - 1], O_WRONLY); | ||
68 | |||
69 | while (1) { | ||
70 | /* | ||
71 | * Make sure we clear the counter before sleeping, as the counter value | ||
72 | * is undefined at this point -- PFM | ||
73 | */ | ||
74 | write(fd, "\0", 1); | ||
75 | sleep(timer_duration); | ||
76 | } | ||
77 | |||
78 | watchdog_shutdown(0); | ||
79 | |||
80 | return EXIT_SUCCESS; | ||
81 | } | ||