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 * Ask malloc() to map minimum-sized chunks of virtual address space at a time,
75 * so that mlockall() won't needlessly wire megabytes of unused memory into the
76 * process. This must be done using the malloc_conf string so that it gets set
77 * up before the first allocation, which happens before entry to main().
79 const char * malloc_conf = "lg_chunk:0";
82 * Periodically pat the watchdog, preventing it from firing.
85 main(int argc, char *argv[])
92 errx(EX_SOFTWARE, "not super user");
94 parseargs(argc, argv);
96 rtp.type = RTP_PRIO_REALTIME;
98 if (rtprio(RTP_SET, 0, &rtp) == -1)
99 err(EX_OSERR, "rtprio");
101 if (watchdog_init() == -1)
102 errx(EX_SOFTWARE, "unable to initialize watchdog");
105 if (watchdog_onoff(1) == -1)
106 err(EX_OSERR, "patting the dog");
108 pfh = pidfile_open(pidfile, 0600, &otherpid);
110 if (errno == EEXIST) {
111 errx(EX_SOFTWARE, "%s already running, pid: %d",
112 getprogname(), otherpid);
114 warn("Cannot open or create pidfile");
117 if (debugging == 0 && daemon(0, 0) == -1) {
120 err(EX_OSERR, "daemon");
123 signal(SIGHUP, SIG_IGN);
124 signal(SIGINT, sighandler);
125 signal(SIGTERM, sighandler);
128 if (madvise(0, 0, MADV_PROTECT) != 0)
129 warn("madvise failed");
130 if (mlockall(MCL_CURRENT | MCL_FUTURE) != 0)
131 warn("mlockall failed");
140 timeout |= WD_PASSIVE;
142 timeout |= WD_ACTIVE;
143 if (watchdog_patpat(timeout) < 0)
144 err(EX_OSERR, "patting the dog");
150 * Catch signals and begin shutdown process.
153 sighandler(int signum)
156 if (signum == SIGINT || signum == SIGTERM)
161 * Open the watchdog device.
167 fd = open("/dev/" _PATH_WATCHDOG, O_RDWR);
170 warn("Could not open watchdog device");
175 * Main program loop which is iterated every second.
183 while (end_program != 2) {
186 if (test_cmd != NULL)
187 failed = system(test_cmd);
189 failed = stat("/etc", &sb);
192 watchdog_patpat(timeout|WD_ACTIVE);
195 if (end_program != 0) {
196 if (watchdog_onoff(0) == 0) {
199 warnx("Could not stop the watchdog, not exiting");
207 * Reset the watchdog timer. This function must be called periodically
208 * to keep the watchdog from firing.
211 watchdog_patpat(u_int t)
214 return ioctl(fd, WDIOCPATPAT, &t);
218 * Toggle the kernel's watchdog. This routine is used to enable and
219 * disable the watchdog.
222 watchdog_onoff(int onoff)
226 return watchdog_patpat((timeout|WD_ACTIVE));
228 return watchdog_patpat(0);
232 * Tell user how to use the program.
238 fprintf(stderr, "usage: watchdogd [-d] [-e cmd] [-I file] [-s sleep] [-t timeout]\n");
240 fprintf(stderr, "usage: watchdog [-d] [-t timeout]\n");
245 * Handle the few command line arguments supported.
248 parseargs(int argc, char *argv[])
255 if (argv[0][c - 1] == 'd')
257 while ((c = getopt(argc, argv,
258 is_daemon ? "I:de:s:t:?" : "dt:?")) != -1) {
267 test_cmd = strdup(optarg);
277 nap = strtol(optarg, &p, 0);
278 if ((p != NULL && *p != '\0') || errno != 0)
279 errx(EX_USAGE, "-s argument is not a number");
284 a = strtod(optarg, &p);
285 if ((p != NULL && *p != '\0') || errno != 0)
286 errx(EX_USAGE, "-t argument is not a number");
288 errx(EX_USAGE, "-t argument must be positive");
290 timeout = WD_TO_NEVER;
292 timeout = flsll(a * 1e9);
294 printf("Timeout is 2^%d nanoseconds\n",
304 errx(EX_USAGE, "extra arguments.");
305 if (is_daemon && timeout < WD_TO_1SEC)
306 errx(EX_USAGE, "-t argument is less than one second.");