Contents of /trunk/mkinitrd-magellan/busybox/miscutils/watchdog.c
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Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
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Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
File MIME type: text/plain
File size: 1389 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
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 | |
13 | #define OPT_FOREGROUND 0x01 |
14 | #define OPT_TIMER 0x02 |
15 | |
16 | /* Watchdog file descriptor */ |
17 | static int fd; |
18 | |
19 | static void watchdog_shutdown(int ATTRIBUTE_UNUSED unused) |
20 | { |
21 | write(fd, "V", 1); /* Magic, see watchdog-api.txt in kernel */ |
22 | close(fd); |
23 | exit(0); |
24 | } |
25 | |
26 | int watchdog_main(int argc, char **argv) |
27 | { |
28 | unsigned opts; |
29 | unsigned timer_duration = 30; /* Userspace timer duration, in seconds */ |
30 | char *t_arg; |
31 | |
32 | opts = getopt32(argc, argv, "Ft:", &t_arg); |
33 | |
34 | if (opts & OPT_TIMER) |
35 | timer_duration = xatou(t_arg); |
36 | |
37 | /* We're only interested in the watchdog device .. */ |
38 | if (optind < argc - 1 || argc == 1) |
39 | bb_show_usage(); |
40 | |
41 | #ifdef BB_NOMMU |
42 | if (!(opts & OPT_FOREGROUND)) |
43 | vfork_daemon_rexec(0, 1, argc, argv, "-F"); |
44 | #else |
45 | xdaemon(0, 1); |
46 | #endif |
47 | |
48 | signal(SIGHUP, watchdog_shutdown); |
49 | signal(SIGINT, watchdog_shutdown); |
50 | |
51 | fd = xopen(argv[argc - 1], O_WRONLY); |
52 | |
53 | while (1) { |
54 | /* |
55 | * Make sure we clear the counter before sleeping, as the counter value |
56 | * is undefined at this point -- PFM |
57 | */ |
58 | write(fd, "\0", 1); |
59 | sleep(timer_duration); |
60 | } |
61 | |
62 | watchdog_shutdown(0); |
63 | |
64 | return EXIT_SUCCESS; |
65 | } |