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Paul Mundt <lethal@linux-sh.org> writes:

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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.
This commit is contained in:
Eric Andersen 2003-07-22 07:39:18 +00:00
parent 592ebd507a
commit cde8f53c60
2 changed files with 47 additions and 13 deletions
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6
include/usage.h
View File

@ -2620,9 +2620,11 @@
"Mon Dec 17 10:31:44 GMT 2000"
#define watchdog_trivial_usage \
"DEV"
"[-t <seconds>] DEV"
#define watchdog_full_usage \
"Periodically write to watchdog device DEV"
"Periodically write to watchdog device DEV.\n" \
"Options:\n" \
"\t-t\tTimer period in seconds - default is 30."
#define wc_trivial_usage \
"[OPTION]... [FILE]..."

54
miscutils/watchdog.c
View File

@ -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) {
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();
}
}
/* We're only interested in the watchdog device .. */
if (optind < argc - 1 || argc == 1)
bb_show_usage();
}
if ((fd=open(argv[1], O_WRONLY)) == -1) {
bb_perror_msg_and_die(argv[1]);
}
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;
}