1 /* $OpenBSD: sthen $ */
4 * Copyright (c) 2005 Marc Balmer <mbalmer@openbsd.org>
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 #include <sys/param.h>
20 #include <sys/ioctl.h>
22 #include <sys/resource.h>
23 #include <sys/sysctl.h>
25 #include <sys/types.h>
35 volatile sig_atomic_t quit = 0;
39 int main(int, char *[]);
44 fprintf(stderr, "usage: %s [-dnq] [-i interval] [-p period]\n",
53 signum = 0; /* Silence warnings */
58 main(int argc, char *argv[])
63 u_int interval = 0, period = 30, nperiod;
64 int fd, ch, trigauto, sauto, speriod;
65 int quiet = 0, daemonize = 1, retval = 1, do_restore = 1;
67 while ((ch = getopt(argc, argv, "di:np:q")) != -1) {
73 interval = (u_int)strtonum(optarg, 1LL, 86400LL,
76 errx(1, "interval is %s: %s", errstr, optarg);
82 period = (u_int)strtonum(optarg, 2LL, 86400LL, &errstr);
84 errx(1, "period is %s: %s", errstr, optarg);
99 if (interval == 0 && (interval = period / 3) == 0)
102 if (period <= interval)
103 errx(1, "retrigger interval too long");
105 /* save kern.watchdog.period and kern.watchdog.auto for restore */
107 len = sizeof(speriod);
108 if (sysctlbyname("kern.watchdog.period", &speriod, &len, &period, sizeof(period)) == -1) {
109 if (errno == EOPNOTSUPP)
110 errx(1, "no watchdog timer available");
112 err(1, "can't access kern.watchdog.period");
118 if (sysctlbyname("kern.watchdog.auto", &sauto, &len, &trigauto, sizeof(trigauto)) == -1)
119 err(1, "can't access kern.watchdog.auto");
121 /* Double check the timeout period, some devices change the value */
122 len = sizeof(nperiod);
123 if (sysctlbyname("kern.watchdog.period", &nperiod, &len, NULL, 0) == -1) {
124 warnx("can't read back kern.watchdog.period, "
125 "restoring original values");
129 if (nperiod != period && !quiet)
130 warnx("period adjusted to %d by device", nperiod);
132 if (nperiod <= interval) {
133 warnx("retrigger interval %d too long, "
134 "restoring original values", interval);
138 if ((fd = open("/dev/wdog", O_RDWR)) == -1) {
139 err(1, "can't open /dev/wdog");
142 if (daemonize && daemon(0, 0)) {
143 warn("can't daemonize, restoring original values");
148 * mlockall() below will wire the whole stack up to the limit
149 * thus we have to reduce stack size to avoid resource abuse
151 rlim.rlim_cur = 256 * 1024;
152 rlim.rlim_max = 256 * 1024;
153 (void)setrlimit(RLIMIT_STACK, &rlim);
155 setpriority(PRIO_PROCESS, getpid(), -5);
157 signal(SIGTERM, sighdlr);
161 if (ioctl(fd, WDIOCRESET, &period, sizeof(period)) == -1)
169 restore: sysctlbyname("kern.watchdog.period", NULL, 0, &speriod, sizeof(speriod));
170 sysctlbyname("kern.watchdog.auto", NULL, 0, &sauto, sizeof(sauto));