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authorSean Kelly <smkelly@FreeBSD.org>2003-06-26 09:50:52 +0000
committerSean Kelly <smkelly@FreeBSD.org>2003-06-26 09:50:52 +0000
commit370c3cb57cb5163d6847a6824b2720554e33754a (patch)
tree98951546927e0d8bb8a7c45b699a83ac3f8e84a9
parentb1d6647755b888699300101f04f8157596292f4c (diff)
downloadsrc-test2-370c3cb57cb5163d6847a6824b2720554e33754a.tar.gz
src-test2-370c3cb57cb5163d6847a6824b2720554e33754a.zip
Notes
-rw-r--r--etc/defaults/rc.conf1
-rwxr-xr-xetc/rc.d/Makefile4
-rw-r--r--etc/rc.d/watchdogd51
-rw-r--r--share/man/man4/Makefile1
-rw-r--r--share/man/man4/watchdog.477
-rw-r--r--sys/conf/NOTES7
-rw-r--r--sys/conf/options1
-rw-r--r--sys/kern/kern_clock.c82
-rw-r--r--usr.sbin/Makefile1
-rw-r--r--usr.sbin/watchdogd/Makefile8
-rw-r--r--usr.sbin/watchdogd/watchdogd.897
-rw-r--r--usr.sbin/watchdogd/watchdogd.c232
12 files changed, 560 insertions, 2 deletions
diff --git a/etc/defaults/rc.conf b/etc/defaults/rc.conf
index 1b6f06641080..d7623ac912be 100644
--- a/etc/defaults/rc.conf
+++ b/etc/defaults/rc.conf
@@ -430,6 +430,7 @@ jail_list="" # Space separated list of names of jails
jail_set_hostname_allow="YES" # Allow root user in a jail to change its hostname
jail_socket_unixiproute_only="YES" # Route only TCP/IP within a jail
jail_sysvipc_allow="NO" # Allow SystemV IPC use from within a jail
+watchdogd_enable="NO" # Start the software watchdog daemon
##############################################################
### Define source_rc_confs, the mechanism used by /etc/rc.* ##
diff --git a/etc/rc.d/Makefile b/etc/rc.d/Makefile
index 4104707f1702..734a3622fb27 100755
--- a/etc/rc.d/Makefile
+++ b/etc/rc.d/Makefile
@@ -17,8 +17,8 @@ FILES= DAEMON LOGIN NETWORKING SERVERS abi accounting addswap adjkerntz amd \
ntpdate othermta pccard pcvt ppp-user pppoed pwcheck quota random \
rarpd rcconf.sh root route6d routed rpcbind rtadvd rwho savecore \
securelevel sendmail serial sppp sshd swap1 syscons sysctl \
- syslogd timed ttys usbd vinum virecover ypbind yppasswdd ypserv \
- ypset ypupdated ypxfrd
+ syslogd timed ttys usbd vinum virecover watchdogd ypbind \
+ yppasswdd ypserv ypset ypupdated ypxfrd
FILESDIR= /etc/rc.d
FILESMODE= ${BINMODE}
diff --git a/etc/rc.d/watchdogd b/etc/rc.d/watchdogd
new file mode 100644
index 000000000000..e2ee5f79cc7a
--- /dev/null
+++ b/etc/rc.d/watchdogd
@@ -0,0 +1,51 @@
+#!/bin/sh
+
+# Copyright (c) 2003 Sean M. Kelly <smkelly@FreeBSD.org>
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+# $FreeBSD$
+#
+
+# PROVIDE: watchdogd
+# REQUIRE: DAEMON
+# KEYWORD: FreeBSD
+
+. /etc/rc.subr
+
+name="watchdogd"
+rcvar="`set_rcvar`"
+command="/usr/sbin/${name}"
+start_precmd="watchdogd_precmd"
+pidfile="/var/run/${name}.pid"
+
+watchdogd_precmd()
+{
+ if ! sysctl debug.watchdog >/dev/null 2>&1; then
+ err 1 "Your kernel doesn't have watchdog support."
+ fi
+ return 0
+}
+
+load_rc_config $name
+run_rc_command "$1"
diff --git a/share/man/man4/Makefile b/share/man/man4/Makefile
index b598875c10b3..31985677a429 100644
--- a/share/man/man4/Makefile
+++ b/share/man/man4/Makefile
@@ -270,6 +270,7 @@ MAN= aac.4 \
vlan.4 \
vpo.4 \
vr.4 \
+ watchdog.4 \
wb.4 \
wi.4 \
witness.4 \
diff --git a/share/man/man4/watchdog.4 b/share/man/man4/watchdog.4
new file mode 100644
index 000000000000..b00ccda2ebd0
--- /dev/null
+++ b/share/man/man4/watchdog.4
@@ -0,0 +1,77 @@
+
+.\" Copyright (c) 2003 Sean M. Kelly <smkelly@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice, this list of conditions and the following disclaimer in the
+.\" documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd June 25, 2003
+.Dt WATCHDOG 4
+.Os
+.Sh NAME
+.Nm watchdog
+.Nd Software watchdog
+.Sh SYNOPSIS
+.Cd options WATCHDOG
+.Sh DESCRIPTION
+.Nm
+is a set of checks and routines which allow the implementation of a software
+watchdog solution.
+.Pp
+The user interface for
+.Nm
+is implemented via a trio of sysctl OIDs.
+When
+.Li debug.watchdog.enabled
+is set to a positive value,
+.Nm
+timeout checks are performed.
+In order to keep the watchdog from triggering,
+.Li debug.watchdog.reset
+must be accessed,
+by reading or writing,
+within every
+.Li debug.watchdog.timeout
+seconds.
+Failure to keep the
+.Nm
+updated will result in the kernel outputting interrupt counts,
+backtraces,
+and then attempting to enter
+.Xr ddb 9 .
+.Sh SEE ALSO
+.Xr sysctl 8 ,
+.Xr watchdogd 8
+.Sh HISTORY
+The
+.Nm
+code first appeared in
+.Fx 5.1 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+code and manual page were written by
+.An Sean Kelly Aq smkelly@FreeBSD.org .
+Some contributions were made by
+.An Jeff Roberson Aq jeff@FreeBSD.org .
diff --git a/sys/conf/NOTES b/sys/conf/NOTES
index f616f88d1e43..c0c8df0adcfb 100644
--- a/sys/conf/NOTES
+++ b/sys/conf/NOTES
@@ -2065,6 +2065,13 @@ options BOOTP_WIRED_TO=fxp0 # Use interface fxp0 for BOOTP
options HW_WDOG
#
+# Add software watchdog routines. This will add some sysctl OIDs that
+# can be used in combination with an external daemon to create a
+# software-based watchdog solution.
+#
+options WATCHDOG
+
+#
# Disable swapping of upages and stack pages. This option removes all
# code which actually performs swapping, so it's not possible to turn
# it back on at run-time.
diff --git a/sys/conf/options b/sys/conf/options
index cf0f70df4365..9d3c724d82f0 100644
--- a/sys/conf/options
+++ b/sys/conf/options
@@ -442,6 +442,7 @@ MUTEX_PROFILING opt_global.h
NPX_DEBUG opt_debug_npx.h
NETATALKDEBUG opt_atalk.h
SI_DEBUG opt_debug_si.h
+WATCHDOG opt_watchdog.h
# Fb options
FB_DEBUG opt_fb.h
diff --git a/sys/kern/kern_clock.c b/sys/kern/kern_clock.c
index 50a48b10084b..53729d2040c3 100644
--- a/sys/kern/kern_clock.c
+++ b/sys/kern/kern_clock.c
@@ -42,6 +42,8 @@
__FBSDID("$FreeBSD$");
#include "opt_ntp.h"
+#include "opt_ddb.h"
+#include "opt_watchdog.h"
#include <sys/param.h>
#include <sys/systm.h>
@@ -71,6 +73,10 @@ __FBSDID("$FreeBSD$");
#include <sys/gmon.h>
#endif
+#ifdef DDB
+#include <ddb/ddb.h>
+#endif
+
#ifdef DEVICE_POLLING
extern void hardclock_device_poll(void);
#endif /* DEVICE_POLLING */
@@ -84,6 +90,22 @@ long cp_time[CPUSTATES];
SYSCTL_OPAQUE(_kern, OID_AUTO, cp_time, CTLFLAG_RD, &cp_time, sizeof(cp_time),
"LU", "CPU time statistics");
+#ifdef WATCHDOG
+static int sysctl_watchdog_reset(SYSCTL_HANDLER_ARGS);
+static void watchdog_fire(void);
+
+static int watchdog_enabled;
+static unsigned int watchdog_ticks;
+static int watchdog_timeout = 20;
+
+SYSCTL_NODE(_debug, OID_AUTO, watchdog, CTLFLAG_RW, 0, "System watchdog");
+SYSCTL_INT(_debug_watchdog, OID_AUTO, enabled, CTLFLAG_RW, &watchdog_enabled,
+ 0, "Enable the watchdog");
+SYSCTL_INT(_debug_watchdog, OID_AUTO, timeout, CTLFLAG_RW, &watchdog_timeout,
+ 0, "Timeout for watchdog checkins");
+
+#endif /* WATCHDOG */
+
/*
* Clock handling routines.
*
@@ -228,6 +250,12 @@ hardclock(frame)
*/
if (need_softclock)
swi_sched(softclock_ih, 0);
+
+#ifdef WATCHDOG
+ if (watchdog_enabled > 0 &&
+ (int)(ticks - watchdog_ticks) >= (hz * watchdog_timeout))
+ watchdog_fire();
+#endif /* WATCHDOG */
}
/*
@@ -481,3 +509,57 @@ sysctl_kern_clockrate(SYSCTL_HANDLER_ARGS)
SYSCTL_PROC(_kern, KERN_CLOCKRATE, clockrate, CTLTYPE_STRUCT|CTLFLAG_RD,
0, 0, sysctl_kern_clockrate, "S,clockinfo",
"Rate and period of various kernel clocks");
+
+#ifdef WATCHDOG
+/*
+ * Reset the watchdog timer to ticks, thus preventing the watchdog
+ * from firing for another watchdog timeout period.
+ */
+static int
+sysctl_watchdog_reset(SYSCTL_HANDLER_ARGS)
+{
+ int ret;
+
+ ret = 0;
+ watchdog_ticks = ticks;
+ return sysctl_handle_int(oidp, &ret, 0, req);
+}
+
+SYSCTL_PROC(_debug_watchdog, OID_AUTO, reset, CTLFLAG_RW, 0, 0,
+ sysctl_watchdog_reset, "I", "Reset the watchdog");
+
+/*
+ * Handle a watchdog timeout by dumping interrupt information and
+ * then either dropping to DDB or panicing.
+ */
+static void
+watchdog_fire(void)
+{
+ int nintr;
+ u_int64_t inttotal;
+ u_long *curintr;
+ char *curname;
+
+ curintr = intrcnt;
+ curname = intrnames;
+ inttotal = 0;
+ nintr = eintrcnt - intrcnt;
+
+ printf("interrupt total\n");
+ while (--nintr >= 0) {
+ if (*curintr)
+ printf("%-12s %20lu\n", curname, *curintr);
+ curname += strlen(curname) + 1;
+ inttotal += *curintr++;
+ }
+ printf("Total %20llu\n", inttotal);
+
+#ifdef DDB
+ db_print_backtrace();
+ Debugger("watchdog timeout");
+#else /* !DDB */
+ panic("watchdog timeout");
+#endif /* DDB */
+}
+
+#endif /* WATCHDOG */
diff --git a/usr.sbin/Makefile b/usr.sbin/Makefile
index b394af90b550..73d331108e38 100644
--- a/usr.sbin/Makefile
+++ b/usr.sbin/Makefile
@@ -124,6 +124,7 @@ SUBDIR= IPXrouted \
vipw \
vnconfig \
watch \
+ watchdogd \
wicontrol \
yp_mkdb \
ypbind \
diff --git a/usr.sbin/watchdogd/Makefile b/usr.sbin/watchdogd/Makefile
new file mode 100644
index 000000000000..bc8bfd24d4a6
--- /dev/null
+++ b/usr.sbin/watchdogd/Makefile
@@ -0,0 +1,8 @@
+# $FreeBSD$
+
+PROG= watchdogd
+SRCS= watchdogd.c
+MAN= watchdogd.8
+WARNS= 6
+
+.include <bsd.prog.mk>
diff --git a/usr.sbin/watchdogd/watchdogd.8 b/usr.sbin/watchdogd/watchdogd.8
new file mode 100644
index 000000000000..b8f7ce8ce0a3
--- /dev/null
+++ b/usr.sbin/watchdogd/watchdogd.8
@@ -0,0 +1,97 @@
+.\" Copyright (c) 2003 Sean M. Kelly <smkelly@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice, this list of conditions and the following disclaimer in the
+.\" documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd June 25, 2003
+.Dt WATCHDOGD 8
+.Os
+.Sh NAME
+.Nm watchdogd
+.Nd Software watchdog daemon
+.Sh SYNOPSIS
+.Nm
+.Op Fl d
+.Op Fl I Ar file
+.Sh DESCRIPTION
+The
+.Nm
+utility interfaces with the kernel's software watchdog facility to ensure
+that the system is in a working state.
+If
+.Nm
+is unable to interface with the kernel over a specific timeout,
+the kernel will take actions to assist in debugging or restarting the computer.
+.Pp
+One possible circumstance which will cause a watchdog timeout is an interrupt
+storm.
+If this occurs,
+.Nm
+will no longer execute and thus the kernel's watchdog routines will take
+action after a configurable timeout.
+.Pp
+Upon receiving the
+.Dv SIGTERM
+or
+.Dv SIGINT
+signals,
+.Nm
+will first instruct the kernel to no longer perform watchdog checks and then
+will terminate.
+.Pp
+The
+.Nm
+utility recognizes the following runtime options:
+.Bl -tag -width ".Fl I Ar file"
+.It Fl I Ar file
+Write the process id of the
+.Nm
+utility in the specified file.
+.It Fl d
+Don't fork.
+When this option is specified,
+.Nm
+will not fork into the background at startup.
+.El
+.Sh FILES
+.Bl -tag -width "/var/run/watchdogd.pid" -compact
+.It Pa /var/run/watchdogd.pid
+.El
+.Sh SEE ALSO
+.Xr watchdog 4 ,
+.Xr sysctl 8
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+utility and manual page were written by
+.An Sean Kelly Aq smkelly@FreeBSD.org .
+.Pp
+Some contributions made by
+.An Jeff Roberson Aq jeff@FreeBSD.org .
+.Sh HISTORY
+The
+.Nm
+utility appeared in
+.Fx 5.1 .
diff --git a/usr.sbin/watchdogd/watchdogd.c b/usr.sbin/watchdogd/watchdogd.c
new file mode 100644
index 000000000000..3dd2f528e14e
--- /dev/null
+++ b/usr.sbin/watchdogd/watchdogd.c
@@ -0,0 +1,232 @@
+/*
+ * Copyright (c) 2003 Sean M. Kelly <smkelly@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Software watchdog daemon.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/errno.h>
+#include <sys/sysctl.h>
+#include <sys/time.h>
+#include <sys/rtprio.h>
+#include <sys/stat.h>
+
+#include <err.h>
+#include <paths.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sysexits.h>
+#include <unistd.h>
+#include <signal.h>
+
+static void parseargs(int, char *[]);
+static void sighandler(int);
+static void watchdog_loop(void);
+static int watchdog_init(void);
+static int watchdog_onoff(int onoff);
+static int watchdog_tickle(void);
+static void usage(void);
+
+int debugging = 0;
+int end_program = 0;
+const char *pidfile = _PATH_VARRUN "watchdogd.pid";
+int reset_mib[3];
+int reset_miblen = 3;
+
+/*
+ * Periodically write to the debug.watchdog.reset sysctl OID
+ * to keep the software watchdog from firing.
+ */
+int
+main(int argc, char *argv[])
+{
+ struct rtprio rtp;
+ FILE *fp;
+
+ if (getuid() != 0)
+ errx(EX_SOFTWARE, "not super user");
+
+ parseargs(argc, argv);
+
+ rtp.type = RTP_PRIO_REALTIME;
+ rtp.prio = 0;
+ if (rtprio(RTP_SET, 0, &rtp) == -1)
+ err(EX_OSERR, "rtprio");
+
+ if (watchdog_init() == -1)
+ exit(EX_SOFTWARE);
+
+ if (watchdog_onoff(1) == -1)
+ exit(EX_SOFTWARE);
+
+ if (debugging == 0 && daemon(0, 0) == -1) {
+ watchdog_onoff(0);
+ err(EX_OSERR, "daemon");
+ }
+
+ signal(SIGHUP, SIG_IGN);
+ signal(SIGINT, sighandler);
+ signal(SIGTERM, sighandler);
+
+ fp = fopen(pidfile, "w");
+ if (fp != NULL) {
+ fprintf(fp, "%d\n", getpid());
+ fclose(fp);
+ }
+
+ watchdog_loop();
+
+ /* exiting */
+ watchdog_onoff(0);
+ unlink(pidfile);
+ return (EX_OK);
+}
+
+/*
+ * Catch signals and begin shutdown process.
+ */
+static void
+sighandler(int signum)
+{
+
+ if (signum == SIGINT || signum == SIGTERM)
+ end_program = 1;
+}
+
+/*
+ * Locate the OID for the 'debug.watchdog.reset' sysctl setting.
+ * Upon finding it, do an initial reset on the watchdog.
+ */
+static int
+watchdog_init()
+{
+ int error;
+
+ error = sysctlnametomib("debug.watchdog.reset", reset_mib,
+ &reset_miblen);
+ if (error == -1) {
+ fprintf(stderr, "Could not find reset OID: %s\n",
+ strerror(errno));
+ return (error);
+ }
+ return watchdog_tickle();
+}
+
+/*
+ * Main program loop which is iterated every second.
+ */
+static void
+watchdog_loop(void)
+{
+ struct stat sb;
+ int failed;
+
+ while (end_program == 0) {
+ failed = 0;
+
+ failed = stat("/etc", &sb);
+
+ if (failed == 0)
+ watchdog_tickle();
+ sleep(1);
+ }
+}
+
+/*
+ * Reset the watchdog timer. This function must be called periodically
+ * to keep the watchdog from firing.
+ */
+int
+watchdog_tickle(void)
+{
+
+ return sysctl(reset_mib, reset_miblen, NULL, NULL, NULL, 0);
+}
+
+/*
+ * Toggle the kernel's watchdog. This routine is used to enable and
+ * disable the watchdog.
+ */
+static int
+watchdog_onoff(int onoff)
+{
+ int mib[3]
+ int error
+ int len;
+
+ len = 3;
+
+ error = sysctlnametomib("debug.watchdog.enabled", mib, &len);
+ if (error == 0)
+ error = sysctl(mib, len, NULL, NULL, &onoff, sizeof(onoff));
+
+ if (error == -1) {
+ fprintf(stderr, "Could not %s watchdog: %s\n",
+ (onoff > 0) ? "enable" : "disable",
+ strerror(errno));
+ return (error);
+ }
+ return (0);
+}
+
+/*
+ * Tell user how to use the program.
+ */
+static void
+usage()
+{
+ fprintf(stderr, "usage: watchdogd [-d] [-I file]\n");
+ exit(EX_USAGE);
+}
+
+/*
+ * Handle the few command line arguments supported.
+ */
+static void
+parseargs(int argc, char *argv[])
+{
+ int c;
+
+ while ((c = getopt(argc, argv, "I:d?")) != -1) {
+ switch (c) {
+ case 'I':
+ pidfile = optarg;
+ break;
+ case 'd':
+ debugging = 1;
+ break;
+ case '?':
+ default:
+ usage();
+ /* NOTREACHED */
+ }
+ }
+}