8b28aef238
them for reading. When user can open file for reading, he can also flock(2) it, which can lead to confusions. Pointed out by: green
288 lines
6.0 KiB
C
288 lines
6.0 KiB
C
/*
|
|
* Copyright (c) 2003-2004 Sean M. Kelly <smkelly@FreeBSD.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* Software watchdog daemon.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/rtprio.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/time.h>
|
|
#include <sys/watchdog.h>
|
|
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <libutil.h>
|
|
#include <math.h>
|
|
#include <paths.h>
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sysexits.h>
|
|
#include <unistd.h>
|
|
|
|
static void parseargs(int, char *[]);
|
|
static void sighandler(int);
|
|
static void watchdog_loop(void);
|
|
static int watchdog_init(void);
|
|
static int watchdog_onoff(int onoff);
|
|
static int watchdog_patpat(void);
|
|
static void usage(void);
|
|
|
|
int debugging = 0;
|
|
int end_program = 0;
|
|
const char *pidfile = _PATH_VARRUN "watchdogd.pid";
|
|
int reset_mib[3];
|
|
size_t reset_miblen = 3;
|
|
u_int timeout = WD_TO_16SEC;
|
|
u_int passive = 0;
|
|
int is_daemon = 0;
|
|
int fd = -1;
|
|
int nap = 1;
|
|
char *test_cmd = NULL;
|
|
|
|
/*
|
|
* Periodically pat the watchdog, preventing it from firing.
|
|
*/
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
struct rtprio rtp;
|
|
struct pidfh *pfh;
|
|
pid_t otherpid;
|
|
|
|
if (getuid() != 0)
|
|
errx(EX_SOFTWARE, "not super user");
|
|
|
|
parseargs(argc, argv);
|
|
|
|
rtp.type = RTP_PRIO_REALTIME;
|
|
rtp.prio = 0;
|
|
if (rtprio(RTP_SET, 0, &rtp) == -1)
|
|
err(EX_OSERR, "rtprio");
|
|
|
|
if (watchdog_init() == -1)
|
|
errx(EX_SOFTWARE, "unable to initialize watchdog");
|
|
|
|
if (is_daemon) {
|
|
if (watchdog_onoff(1) == -1)
|
|
exit(EX_SOFTWARE);
|
|
|
|
pfh = pidfile_open(pidfile, 0600, &otherpid);
|
|
if (pfh == NULL) {
|
|
if (errno == EEXIST) {
|
|
errx(EX_SOFTWARE, "%s already running, pid: %d",
|
|
getprogname(), otherpid);
|
|
}
|
|
warn("Cannot open or create pidfile");
|
|
}
|
|
|
|
if (debugging == 0 && daemon(0, 0) == -1) {
|
|
watchdog_onoff(0);
|
|
pidfile_remove(pfh);
|
|
err(EX_OSERR, "daemon");
|
|
}
|
|
|
|
signal(SIGHUP, SIG_IGN);
|
|
signal(SIGINT, sighandler);
|
|
signal(SIGTERM, sighandler);
|
|
|
|
pidfile_write(pfh);
|
|
|
|
watchdog_loop();
|
|
|
|
/* exiting */
|
|
watchdog_onoff(0);
|
|
pidfile_remove(pfh);
|
|
return (EX_OK);
|
|
} else {
|
|
if (passive)
|
|
timeout |= WD_PASSIVE;
|
|
else
|
|
timeout |= WD_ACTIVE;
|
|
if (watchdog_patpat() < 0 &&
|
|
(timeout & WD_INTERVAL) != WD_TO_NEVER)
|
|
err(EX_OSERR, "patting the dog");
|
|
return (EX_OK);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Catch signals and begin shutdown process.
|
|
*/
|
|
static void
|
|
sighandler(int signum)
|
|
{
|
|
|
|
if (signum == SIGINT || signum == SIGTERM)
|
|
end_program = 1;
|
|
}
|
|
|
|
/*
|
|
* Open the watchdog device.
|
|
*/
|
|
static int
|
|
watchdog_init()
|
|
{
|
|
|
|
fd = open("/dev/" _PATH_WATCHDOG, O_RDWR);
|
|
if (fd >= 0)
|
|
return (0);
|
|
warn("Could not open watchdog device");
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* Main program loop which is iterated every second.
|
|
*/
|
|
static void
|
|
watchdog_loop(void)
|
|
{
|
|
struct stat sb;
|
|
int failed;
|
|
|
|
while (end_program == 0) {
|
|
failed = 0;
|
|
|
|
if (test_cmd != NULL)
|
|
failed = system(test_cmd);
|
|
else
|
|
failed = stat("/etc", &sb);
|
|
|
|
if (failed == 0)
|
|
watchdog_patpat();
|
|
sleep(nap);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Reset the watchdog timer. This function must be called periodically
|
|
* to keep the watchdog from firing.
|
|
*/
|
|
int
|
|
watchdog_patpat(void)
|
|
{
|
|
|
|
return ioctl(fd, WDIOCPATPAT, &timeout);
|
|
}
|
|
|
|
/*
|
|
* Toggle the kernel's watchdog. This routine is used to enable and
|
|
* disable the watchdog.
|
|
*/
|
|
static int
|
|
watchdog_onoff(int onoff)
|
|
{
|
|
|
|
if (onoff)
|
|
timeout |= WD_ACTIVE;
|
|
else
|
|
timeout &= ~WD_ACTIVE;
|
|
return watchdog_patpat();
|
|
}
|
|
|
|
/*
|
|
* Tell user how to use the program.
|
|
*/
|
|
static void
|
|
usage()
|
|
{
|
|
if (is_daemon)
|
|
fprintf(stderr, "usage: watchdogd [-d] [-e cmd] [-I file]\n");
|
|
else
|
|
fprintf(stderr, "usage: watchdog [-d] [-t]\n");
|
|
exit(EX_USAGE);
|
|
}
|
|
|
|
/*
|
|
* Handle the few command line arguments supported.
|
|
*/
|
|
static void
|
|
parseargs(int argc, char *argv[])
|
|
{
|
|
int c;
|
|
char *p;
|
|
double a;
|
|
|
|
c = strlen(argv[0]);
|
|
if (argv[0][c - 1] == 'd')
|
|
is_daemon = 1;
|
|
while ((c = getopt(argc, argv,
|
|
is_daemon ? "I:de:s:t:?" : "dt:?")) != -1) {
|
|
switch (c) {
|
|
case 'I':
|
|
pidfile = optarg;
|
|
break;
|
|
case 'd':
|
|
debugging = 1;
|
|
break;
|
|
case 'e':
|
|
test_cmd = strdup(optarg);
|
|
break;
|
|
#ifdef notyet
|
|
case 'p':
|
|
passive = 1;
|
|
break;
|
|
#endif
|
|
case 's':
|
|
p = NULL;
|
|
errno = 0;
|
|
nap = strtol(optarg, &p, 0);
|
|
if ((p != NULL && *p != '\0') || errno != 0)
|
|
errx(EX_USAGE, "-s argument is not a number");
|
|
break;
|
|
case 't':
|
|
p = NULL;
|
|
errno = 0;
|
|
a = strtod(optarg, &p);
|
|
if ((p != NULL && *p != '\0') || errno != 0)
|
|
errx(EX_USAGE, "-t argument is not a number");
|
|
if (a < 0)
|
|
errx(EX_USAGE, "-t argument must be positive");
|
|
if (a == 0)
|
|
timeout = WD_TO_NEVER;
|
|
else
|
|
timeout = 1.0 + log(a * 1e9) / log(2.0);
|
|
if (debugging)
|
|
printf("Timeout is 2^%d nanoseconds\n",
|
|
timeout);
|
|
break;
|
|
case '?':
|
|
default:
|
|
usage();
|
|
/* NOTREACHED */
|
|
}
|
|
}
|
|
if (is_daemon && timeout < WD_TO_1SEC)
|
|
errx(EX_USAGE, "-t argument is less than one second.");
|
|
}
|