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("$FreeBSD$");
35 #include <sys/param.h>
36 #include <sys/rtprio.h>
39 #include <sys/watchdog.h>
55 static void parseargs(int, char *[]);
56 static void sighandler(int);
57 static void watchdog_loop(void);
58 static int watchdog_init(void);
59 static int watchdog_onoff(int onoff);
60 static int watchdog_patpat(u_int timeout);
61 static void usage(void);
63 static int debugging = 0;
64 static int end_program = 0;
65 static const char *pidfile = _PATH_VARRUN "watchdogd.pid";
66 static u_int timeout = WD_TO_16SEC;
67 static u_int passive = 0;
68 static int is_daemon = 0;
71 static 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)
98 err(EX_OSERR, "patting the dog");
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);
120 if (madvise(0, 0, MADV_PROTECT) != 0)
121 warn("madvise failed");
122 if (mlockall(MCL_CURRENT | MCL_FUTURE) != 0)
123 warn("mlockall failed");
132 timeout |= WD_PASSIVE;
134 timeout |= WD_ACTIVE;
135 if (watchdog_patpat(timeout) < 0)
136 err(EX_OSERR, "patting the dog");
142 * Catch signals and begin shutdown process.
145 sighandler(int signum)
148 if (signum == SIGINT || signum == SIGTERM)
153 * Open the watchdog device.
159 fd = open("/dev/" _PATH_WATCHDOG, O_RDWR);
162 warn("Could not open watchdog device");
167 * Main program loop which is iterated every second.
175 while (end_program != 2) {
178 if (test_cmd != NULL)
179 failed = system(test_cmd);
181 failed = stat("/etc", &sb);
184 watchdog_patpat(timeout|WD_ACTIVE);
187 if (end_program != 0) {
188 if (watchdog_onoff(0) == 0) {
191 warnx("Could not stop the watchdog, not exitting");
199 * Reset the watchdog timer. This function must be called periodically
200 * to keep the watchdog from firing.
203 watchdog_patpat(u_int t)
206 return ioctl(fd, WDIOCPATPAT, &t);
210 * Toggle the kernel's watchdog. This routine is used to enable and
211 * disable the watchdog.
214 watchdog_onoff(int onoff)
218 return watchdog_patpat((timeout|WD_ACTIVE));
220 return watchdog_patpat(0);
224 * Tell user how to use the program.
230 fprintf(stderr, "usage: watchdogd [-d] [-e cmd] [-I file] [-s sleep] [-t timeout]\n");
232 fprintf(stderr, "usage: watchdog [-d] [-t timeout]\n");
237 * Handle the few command line arguments supported.
240 parseargs(int argc, char *argv[])
247 if (argv[0][c - 1] == 'd')
249 while ((c = getopt(argc, argv,
250 is_daemon ? "I:de:s:t:?" : "dt:?")) != -1) {
259 test_cmd = strdup(optarg);
269 nap = strtol(optarg, &p, 0);
270 if ((p != NULL && *p != '\0') || errno != 0)
271 errx(EX_USAGE, "-s argument is not a number");
276 a = strtod(optarg, &p);
277 if ((p != NULL && *p != '\0') || errno != 0)
278 errx(EX_USAGE, "-t argument is not a number");
280 errx(EX_USAGE, "-t argument must be positive");
282 timeout = WD_TO_NEVER;
284 timeout = flsll(a * 1e9);
286 printf("Timeout is 2^%d nanoseconds\n",
296 errx(EX_USAGE, "extra arguments.");
297 if (is_daemon && timeout < WD_TO_1SEC)
298 errx(EX_USAGE, "-t argument is less than one second.");