2 * Copyright (c) 2003-2004 Sean M. Kelly <smkelly@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * Software watchdog daemon.
31 #include <sys/types.h>
32 __FBSDID("$FreeBSD$");
34 #include <sys/param.h>
35 #include <sys/rtprio.h>
38 #include <sys/watchdog.h>
53 static void parseargs(int, char *[]);
54 static void sighandler(int);
55 static void watchdog_loop(void);
56 static int watchdog_init(void);
57 static int watchdog_onoff(int onoff);
58 static int watchdog_patpat(void);
59 static void usage(void);
63 const char *pidfile = _PATH_VARRUN "watchdogd.pid";
65 size_t reset_miblen = 3;
66 u_int timeout = WD_TO_16SEC;
71 char *test_cmd = NULL;
74 * Periodically pat the watchdog, preventing it from firing.
77 main(int argc, char *argv[])
84 errx(EX_SOFTWARE, "not super user");
86 parseargs(argc, argv);
88 rtp.type = RTP_PRIO_REALTIME;
90 if (rtprio(RTP_SET, 0, &rtp) == -1)
91 err(EX_OSERR, "rtprio");
93 if (watchdog_init() == -1)
94 errx(EX_SOFTWARE, "unable to initialize watchdog");
97 if (watchdog_onoff(1) == -1)
100 pfh = pidfile_open(pidfile, 0600, &otherpid);
102 if (errno == EEXIST) {
103 errx(EX_SOFTWARE, "%s already running, pid: %d",
104 getprogname(), otherpid);
106 warn("Cannot open or create pidfile");
109 if (debugging == 0 && daemon(0, 0) == -1) {
112 err(EX_OSERR, "daemon");
115 signal(SIGHUP, SIG_IGN);
116 signal(SIGINT, sighandler);
117 signal(SIGTERM, sighandler);
129 timeout |= WD_PASSIVE;
131 timeout |= WD_ACTIVE;
132 if (watchdog_patpat() < 0)
133 err(EX_OSERR, "patting the dog");
139 * Catch signals and begin shutdown process.
142 sighandler(int signum)
145 if (signum == SIGINT || signum == SIGTERM)
150 * Open the watchdog device.
156 fd = open("/dev/" _PATH_WATCHDOG, O_RDWR);
159 warn("Could not open watchdog device");
164 * Main program loop which is iterated every second.
172 while (end_program == 0) {
175 if (test_cmd != NULL)
176 failed = system(test_cmd);
178 failed = stat("/etc", &sb);
187 * Reset the watchdog timer. This function must be called periodically
188 * to keep the watchdog from firing.
191 watchdog_patpat(void)
194 return ioctl(fd, WDIOCPATPAT, &timeout);
198 * Toggle the kernel's watchdog. This routine is used to enable and
199 * disable the watchdog.
202 watchdog_onoff(int onoff)
206 timeout |= WD_ACTIVE;
208 timeout &= ~WD_ACTIVE;
209 return watchdog_patpat();
213 * Tell user how to use the program.
219 fprintf(stderr, "usage: watchdogd [-d] [-e cmd] [-I file]\n");
221 fprintf(stderr, "usage: watchdog [-d] [-t timeout]\n");
226 * Handle the few command line arguments supported.
229 parseargs(int argc, char *argv[])
236 if (argv[0][c - 1] == 'd')
238 while ((c = getopt(argc, argv,
239 is_daemon ? "I:de:s:t:?" : "dt:?")) != -1) {
248 test_cmd = strdup(optarg);
258 nap = strtol(optarg, &p, 0);
259 if ((p != NULL && *p != '\0') || errno != 0)
260 errx(EX_USAGE, "-s argument is not a number");
265 a = strtod(optarg, &p);
266 if ((p != NULL && *p != '\0') || errno != 0)
267 errx(EX_USAGE, "-t argument is not a number");
269 errx(EX_USAGE, "-t argument must be positive");
271 timeout = WD_TO_NEVER;
273 timeout = 1.0 + log(a * 1e9) / log(2.0);
275 printf("Timeout is 2^%d nanoseconds\n",
285 errx(EX_USAGE, "extra arguments.");
286 if (is_daemon && timeout < WD_TO_1SEC)
287 errx(EX_USAGE, "-t argument is less than one second.");