--- /dev/null
+.\" $OpenBSD: jmc $
+.\"
+.\" Copyright (c) 2005 Marc Balmer <mbalmer@openbsd.org>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd $Mdocdate$
+.Dt WATCHDOGD 8
+.Os
+.Sh NAME
+.Nm watchdogd
+.Nd watchdog timer retrigger daemon
+.Sh SYNOPSIS
+.Nm watchdogd
+.Op Fl dnq
+.Op Fl i Ar interval
+.Op Fl p Ar period
+.Sh DESCRIPTION
+.Nm
+is a daemon to activate and periodically retrigger the
+.Xr watchdog 4
+timer device from userland.
+.Nm
+is designed to work in high load environments,
+where other methods
+(such as a shell script invoking
+.Xr sysctl 8 )
+would involve too much overhead.
+.Pp
+The basic premise is that
+after every
+.Ar interval
+seconds,
+.Nm
+resets the hardware timer to
+.Ar period .
+See also
+.Xr watchdog 4
+for more information on how watchdog timers work.
+.Pp
+The options are as follows:
+.Bl -tag -width Ds
+.It Fl d
+Do not daemonize.
+If this option is specified,
+.Nm
+will run in the foreground.
+.It Fl i Ar interval
+Specify how often, in seconds,
+.Nm
+should retrigger the hardware timer.
+If no interval is specified,
+the value of
+.Ar period
+(see below)
+divided by three is used.
+.It Fl n
+Do not restore the watchdog to its original values once it has been activated.
+With this set, the system will be rebooted by the watchdog even after a
+.Xr halt 8 .
+.It Fl p Ar period
+Set the hardware timer to expire in
+.Ar period
+seconds.
+The default is 30 seconds.
+.It Fl q
+Be quiet.
+With this option specified,
+.Nm
+will not output a warning message if the underlying hardware adjusted the
+timeout period.
+.El
+.Sh SEE ALSO
+.Xr watchdog 4 ,
+.Xr sysctl 8
+.Sh HISTORY
+The
+.Nm
+program
+first appeared in
+.Ox 3.8 .
+.Sh AUTHORS
+.Nm
+was written by
+.An Marc Balmer Aq mbalmer@openbsd.org .
--- /dev/null
+/* $OpenBSD: sthen $ */
+
+/*
+ * Copyright (c) 2005 Marc Balmer <mbalmer@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/param.h>
+#include <sys/sysctl.h>
+#include <sys/mman.h>
+
+#include <err.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+volatile sig_atomic_t quit = 0;
+
+__dead void usage(void);
+void sighdlr(int);
+int main(int, char *[]);
+
+__dead void
+usage(void)
+{
+ extern char *__progname;
+
+ fprintf(stderr, "usage: %s [-dnq] [-i interval] [-p period]\n",
+ __progname);
+ exit(1);
+}
+
+/* ARGSUSED */
+void
+sighdlr(int signum)
+{
+ quit = 1;
+}
+
+int
+main(int argc, char *argv[])
+{
+ struct rlimit rlim;
+ const char *errstr;
+ size_t len;
+ u_int interval = 0, period = 30, nperiod;
+ int ch, trigauto, sauto, speriod;
+ int quiet = 0, daemonize = 1, retval = 1, do_restore = 1;
+ int mib[3];
+
+ while ((ch = getopt(argc, argv, "di:np:q")) != -1) {
+ switch (ch) {
+ case 'd':
+ daemonize = 0;
+ break;
+ case 'i':
+ interval = (u_int)strtonum(optarg, 1LL, 86400LL,
+ &errstr);
+ if (errstr)
+ errx(1, "interval is %s: %s", errstr, optarg);
+ break;
+ case 'n':
+ do_restore = 0;
+ break;
+ case 'p':
+ period = (u_int)strtonum(optarg, 2LL, 86400LL, &errstr);
+ if (errstr)
+ errx(1, "period is %s: %s", errstr, optarg);
+ break;
+ case 'q':
+ quiet = 1;
+ break;
+ default:
+ usage();
+ }
+ }
+
+ argc -= optind;
+ argv += optind;
+ if (argc > 0)
+ usage();
+
+ if (interval == 0 && (interval = period / 3) == 0)
+ interval = 1;
+
+ if (period <= interval)
+ errx(1, "retrigger interval too long");
+
+ /* save kern.watchdog.period and kern.watchdog.auto for restore */
+ mib[0] = CTL_KERN;
+ mib[1] = KERN_WATCHDOG;
+ mib[2] = KERN_WATCHDOG_PERIOD;
+
+ len = sizeof(speriod);
+ if (sysctl(mib, 3, &speriod, &len, &period, sizeof(period)) == -1) {
+ if (errno == EOPNOTSUPP)
+ errx(1, "no watchdog timer available");
+ else
+ err(1, "can't access kern.watchdog.period");
+ }
+
+ mib[2] = KERN_WATCHDOG_AUTO;
+ len = sizeof(sauto);
+ trigauto = 0;
+
+ if (sysctl(mib, 3, &sauto, &len, &trigauto, sizeof(trigauto)) == -1)
+ err(1, "can't access kern.watchdog.auto");
+
+ /* Double check the timeout period, some devices change the value */
+ mib[2] = KERN_WATCHDOG_PERIOD;
+ len = sizeof(nperiod);
+ if (sysctl(mib, 3, &nperiod, &len, NULL, 0) == -1) {
+ warnx("can't read back kern.watchdog.period, "
+ "restoring original values");
+ goto restore;
+ }
+
+ if (nperiod != period && !quiet)
+ warnx("period adjusted to %d by device", nperiod);
+
+ if (nperiod <= interval) {
+ warnx("retrigger interval %d too long, "
+ "restoring original values", interval);
+ goto restore;
+ }
+
+ if (daemonize && daemon(0, 0)) {
+ warn("can't daemonize, restoring original values");
+ goto restore;
+ }
+
+ /*
+ * mlockall() below will wire the whole stack up to the limit
+ * thus we have to reduce stack size to avoid resource abuse
+ */
+ rlim.rlim_cur = 256 * 1024;
+ rlim.rlim_max = 256 * 1024;
+ (void)setrlimit(RLIMIT_STACK, &rlim);
+
+ (void)mlockall(MCL_CURRENT | MCL_FUTURE);
+ setpriority(PRIO_PROCESS, getpid(), -5);
+
+ signal(SIGTERM, sighdlr);
+
+ retval = 0;
+ while (!quit) {
+ if (sysctl(mib, 3, NULL, 0, &period, sizeof(period)) == -1)
+ quit = retval = 1;
+ sleep(interval);
+ }
+
+ if (do_restore) {
+restore: sysctl(mib, 3, NULL, 0, &speriod, sizeof(speriod));
+ mib[2] = KERN_WATCHDOG_AUTO;
+ sysctl(mib, 3, NULL, 0, &sauto, sizeof(sauto));
+ }
+
+ return retval;
+}
polachok's projects / dragonfly.git / commitdiff