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cde8f53c60
Here's a bunch of fixes for the watchdog app in busybox. This does a couple of things: - configurable timer duration (userspace timer duration is usually configurable within the device drivers themselves). - run as a daemon - shutdown the device properly on SIGINT or SIGHUP - clear the counter immediately instead of sleeping first as well as updating the usage information. This has also been switched over to getopt to deal with the optional timer duration specifier. The changes themselves are harmless and isolated, and I've veried that this works on sh and x86 without any problems.
82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini watchdog implementation for busybox
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*
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* Copyright (C) 2003 Paul Mundt <lethal@linux-sh.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <signal.h>
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#include "busybox.h"
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/* Userspace timer duration, in seconds */
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static unsigned int timer_duration = 30;
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/* Watchdog file descriptor */
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static int fd;
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static void watchdog_shutdown(int unused)
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{
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write(fd, "V", 1); /* Magic */
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close(fd);
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exit(0);
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}
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extern int watchdog_main(int argc, char **argv)
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{
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int opt;
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while ((opt = getopt(argc, argv, "t:")) > 0) {
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switch (opt) {
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case 't':
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timer_duration = bb_xgetlarg(optarg, 10, 0, INT_MAX);
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break;
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default:
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bb_show_usage();
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}
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}
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/* We're only interested in the watchdog device .. */
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if (optind < argc - 1 || argc == 1)
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bb_show_usage();
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if (daemon(0, 1) < 0)
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bb_perror_msg_and_die("Failed forking watchdog daemon");
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signal(SIGHUP, watchdog_shutdown);
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signal(SIGINT, watchdog_shutdown);
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fd = bb_xopen(argv[argc - 1], O_WRONLY);
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while (1) {
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/*
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* Make sure we clear the counter before sleeping, as the counter value
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* is undefined at this point -- PFM
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*/
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write(fd, "\0", 1);
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sleep(timer_duration);
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}
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watchdog_shutdown(0);
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return EXIT_SUCCESS;
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}
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