diff options
Diffstat (limited to 'miscutils/watchdog.c')
| -rw-r--r-- | miscutils/watchdog.c | 54 |
1 files changed, 43 insertions, 11 deletions
diff --git a/miscutils/watchdog.c b/miscutils/watchdog.c index cfe19abc3..b1167dc90 100644 --- a/miscutils/watchdog.c +++ b/miscutils/watchdog.c @@ -2,7 +2,7 @@ /* * Mini watchdog implementation for busybox * - * Copyright (C) 2000 spoon <spoon@ix.netcom.com>. + * Copyright (C) 2003 Paul Mundt <lethal@linux-sh.org> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -20,30 +20,62 @@ * */ -/* getopt not needed */ - #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 unused) +{ + write(fd, "V", 1); /* Magic */ + close(fd); + exit(0); +} + extern int watchdog_main(int argc, char **argv) { - int fd; + int opt; - if (argc != 2) { - bb_show_usage(); + while ((opt = getopt(argc, argv, "t:")) > 0) { + switch (opt) { + case 't': + timer_duration = bb_xgetlarg(optarg, 10, 0, INT_MAX); + break; + default: + bb_show_usage(); + } } - if ((fd=open(argv[1], O_WRONLY)) == -1) { - bb_perror_msg_and_die(argv[1]); - } + /* 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) { - sleep(30); + /* + * 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); } - return EXIT_FAILURE; + watchdog_shutdown(0); + + return EXIT_SUCCESS; } |