- Add a software watchdog facility.
This commit has two pieces. One half is the watchdog kernel code which lives primarily in hardclock() in sys/kern/kern_clock.c. The other half is a userland daemon which, when run, will keep the watchdog from firing while the userland is intact and functioning. Approved by: jeff (mentor)
This commit is contained in:
parent
b1d6647755
commit
370c3cb57c
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=116874
@ -430,6 +430,7 @@ jail_list="" # Space separated list of names of jails
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jail_set_hostname_allow="YES" # Allow root user in a jail to change its hostname
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jail_set_hostname_allow="YES" # Allow root user in a jail to change its hostname
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jail_socket_unixiproute_only="YES" # Route only TCP/IP within a jail
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jail_socket_unixiproute_only="YES" # Route only TCP/IP within a jail
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jail_sysvipc_allow="NO" # Allow SystemV IPC use from within a jail
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jail_sysvipc_allow="NO" # Allow SystemV IPC use from within a jail
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watchdogd_enable="NO" # Start the software watchdog daemon
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##############################################################
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##############################################################
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### Define source_rc_confs, the mechanism used by /etc/rc.* ##
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### Define source_rc_confs, the mechanism used by /etc/rc.* ##
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@ -17,8 +17,8 @@ FILES= DAEMON LOGIN NETWORKING SERVERS abi accounting addswap adjkerntz amd \
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ntpdate othermta pccard pcvt ppp-user pppoed pwcheck quota random \
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ntpdate othermta pccard pcvt ppp-user pppoed pwcheck quota random \
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rarpd rcconf.sh root route6d routed rpcbind rtadvd rwho savecore \
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rarpd rcconf.sh root route6d routed rpcbind rtadvd rwho savecore \
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securelevel sendmail serial sppp sshd swap1 syscons sysctl \
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securelevel sendmail serial sppp sshd swap1 syscons sysctl \
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syslogd timed ttys usbd vinum virecover ypbind yppasswdd ypserv \
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syslogd timed ttys usbd vinum virecover watchdogd ypbind \
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ypset ypupdated ypxfrd
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yppasswdd ypserv ypset ypupdated ypxfrd
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FILESDIR= /etc/rc.d
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FILESDIR= /etc/rc.d
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FILESMODE= ${BINMODE}
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FILESMODE= ${BINMODE}
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51
etc/rc.d/watchdogd
Normal file
51
etc/rc.d/watchdogd
Normal file
@ -0,0 +1,51 @@
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#!/bin/sh
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# Copyright (c) 2003 Sean M. Kelly <smkelly@FreeBSD.org>
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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|
# are met:
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|
# 1. Redistributions of source code must retain the above copyright
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|
# notice, this list of conditions and the following disclaimer.
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|
# 2. Redistributions in binary form must reproduce the above copyright
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||||||
|
# notice, this list of conditions and the following disclaimer in the
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|
# documentation and/or other materials provided with the distribution.
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|
#
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# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# $FreeBSD$
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#
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# PROVIDE: watchdogd
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# REQUIRE: DAEMON
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# KEYWORD: FreeBSD
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. /etc/rc.subr
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name="watchdogd"
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rcvar="`set_rcvar`"
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command="/usr/sbin/${name}"
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start_precmd="watchdogd_precmd"
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pidfile="/var/run/${name}.pid"
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watchdogd_precmd()
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{
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if ! sysctl debug.watchdog >/dev/null 2>&1; then
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err 1 "Your kernel doesn't have watchdog support."
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fi
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return 0
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}
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load_rc_config $name
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run_rc_command "$1"
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@ -270,6 +270,7 @@ MAN= aac.4 \
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vlan.4 \
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vlan.4 \
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vpo.4 \
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vpo.4 \
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vr.4 \
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vr.4 \
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watchdog.4 \
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wb.4 \
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wb.4 \
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wi.4 \
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wi.4 \
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witness.4 \
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witness.4 \
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77
share/man/man4/watchdog.4
Normal file
77
share/man/man4/watchdog.4
Normal file
@ -0,0 +1,77 @@
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.\" Copyright (c) 2003 Sean M. Kelly <smkelly@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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|
.\" are met:
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|
.\" 1. Redistributions of source code must retain the above copyright
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||||||
|
.\" notice, this list of conditions and the following disclaimer.
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|
.\" 2. Redistributions in binary form must reproduce the above copyright
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|
.\" notice, this list of conditions and the following disclaimer in the
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|
.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd June 25, 2003
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.Dt WATCHDOG 4
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.Os
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.Sh NAME
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.Nm watchdog
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.Nd Software watchdog
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.Sh SYNOPSIS
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.Cd options WATCHDOG
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.Sh DESCRIPTION
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.Nm
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is a set of checks and routines which allow the implementation of a software
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watchdog solution.
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.Pp
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The user interface for
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.Nm
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is implemented via a trio of sysctl OIDs.
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When
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.Li debug.watchdog.enabled
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is set to a positive value,
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.Nm
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timeout checks are performed.
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In order to keep the watchdog from triggering,
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.Li debug.watchdog.reset
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must be accessed,
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by reading or writing,
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within every
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.Li debug.watchdog.timeout
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seconds.
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Failure to keep the
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.Nm
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updated will result in the kernel outputting interrupt counts,
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backtraces,
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and then attempting to enter
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.Xr ddb 9 .
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.Sh SEE ALSO
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.Xr sysctl 8 ,
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.Xr watchdogd 8
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.Sh HISTORY
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The
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.Nm
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code first appeared in
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.Fx 5.1 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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code and manual page were written by
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.An Sean Kelly Aq smkelly@FreeBSD.org .
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Some contributions were made by
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.An Jeff Roberson Aq jeff@FreeBSD.org .
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@ -2064,6 +2064,13 @@ options BOOTP_WIRED_TO=fxp0 # Use interface fxp0 for BOOTP
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#
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#
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options HW_WDOG
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options HW_WDOG
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#
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# Add software watchdog routines. This will add some sysctl OIDs that
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# can be used in combination with an external daemon to create a
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# software-based watchdog solution.
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#
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options WATCHDOG
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#
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#
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# Disable swapping of upages and stack pages. This option removes all
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# Disable swapping of upages and stack pages. This option removes all
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# code which actually performs swapping, so it's not possible to turn
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# code which actually performs swapping, so it's not possible to turn
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@ -442,6 +442,7 @@ MUTEX_PROFILING opt_global.h
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NPX_DEBUG opt_debug_npx.h
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NPX_DEBUG opt_debug_npx.h
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NETATALKDEBUG opt_atalk.h
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NETATALKDEBUG opt_atalk.h
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SI_DEBUG opt_debug_si.h
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SI_DEBUG opt_debug_si.h
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WATCHDOG opt_watchdog.h
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# Fb options
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# Fb options
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FB_DEBUG opt_fb.h
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FB_DEBUG opt_fb.h
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@ -42,6 +42,8 @@
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__FBSDID("$FreeBSD$");
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__FBSDID("$FreeBSD$");
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#include "opt_ntp.h"
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#include "opt_ntp.h"
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#include "opt_ddb.h"
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#include "opt_watchdog.h"
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#include <sys/param.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/systm.h>
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@ -71,6 +73,10 @@ __FBSDID("$FreeBSD$");
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#include <sys/gmon.h>
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#include <sys/gmon.h>
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#endif
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#endif
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#ifdef DDB
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#include <ddb/ddb.h>
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#endif
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#ifdef DEVICE_POLLING
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#ifdef DEVICE_POLLING
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extern void hardclock_device_poll(void);
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extern void hardclock_device_poll(void);
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#endif /* DEVICE_POLLING */
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#endif /* DEVICE_POLLING */
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@ -84,6 +90,22 @@ long cp_time[CPUSTATES];
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SYSCTL_OPAQUE(_kern, OID_AUTO, cp_time, CTLFLAG_RD, &cp_time, sizeof(cp_time),
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SYSCTL_OPAQUE(_kern, OID_AUTO, cp_time, CTLFLAG_RD, &cp_time, sizeof(cp_time),
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"LU", "CPU time statistics");
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"LU", "CPU time statistics");
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#ifdef WATCHDOG
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static int sysctl_watchdog_reset(SYSCTL_HANDLER_ARGS);
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static void watchdog_fire(void);
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static int watchdog_enabled;
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static unsigned int watchdog_ticks;
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static int watchdog_timeout = 20;
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SYSCTL_NODE(_debug, OID_AUTO, watchdog, CTLFLAG_RW, 0, "System watchdog");
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SYSCTL_INT(_debug_watchdog, OID_AUTO, enabled, CTLFLAG_RW, &watchdog_enabled,
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0, "Enable the watchdog");
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SYSCTL_INT(_debug_watchdog, OID_AUTO, timeout, CTLFLAG_RW, &watchdog_timeout,
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|
0, "Timeout for watchdog checkins");
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#endif /* WATCHDOG */
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/*
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/*
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* Clock handling routines.
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* Clock handling routines.
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*
|
*
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@ -228,6 +250,12 @@ hardclock(frame)
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*/
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*/
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if (need_softclock)
|
if (need_softclock)
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swi_sched(softclock_ih, 0);
|
swi_sched(softclock_ih, 0);
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|
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|
#ifdef WATCHDOG
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|
if (watchdog_enabled > 0 &&
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(int)(ticks - watchdog_ticks) >= (hz * watchdog_timeout))
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|
watchdog_fire();
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|
#endif /* WATCHDOG */
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}
|
}
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/*
|
/*
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@ -481,3 +509,57 @@ sysctl_kern_clockrate(SYSCTL_HANDLER_ARGS)
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SYSCTL_PROC(_kern, KERN_CLOCKRATE, clockrate, CTLTYPE_STRUCT|CTLFLAG_RD,
|
SYSCTL_PROC(_kern, KERN_CLOCKRATE, clockrate, CTLTYPE_STRUCT|CTLFLAG_RD,
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0, 0, sysctl_kern_clockrate, "S,clockinfo",
|
0, 0, sysctl_kern_clockrate, "S,clockinfo",
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"Rate and period of various kernel clocks");
|
"Rate and period of various kernel clocks");
|
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|
|
||||||
|
#ifdef WATCHDOG
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|
/*
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|
* Reset the watchdog timer to ticks, thus preventing the watchdog
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|
* from firing for another watchdog timeout period.
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|
*/
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|
static int
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|
sysctl_watchdog_reset(SYSCTL_HANDLER_ARGS)
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||||||
|
{
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|
int ret;
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||||||
|
|
||||||
|
ret = 0;
|
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|
watchdog_ticks = ticks;
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||||||
|
return sysctl_handle_int(oidp, &ret, 0, req);
|
||||||
|
}
|
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|
|
||||||
|
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.
|
||||||
|
*/
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||||||
|
static void
|
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|
watchdog_fire(void)
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|
{
|
||||||
|
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 */
|
||||||
|
@ -124,6 +124,7 @@ SUBDIR= IPXrouted \
|
|||||||
vipw \
|
vipw \
|
||||||
vnconfig \
|
vnconfig \
|
||||||
watch \
|
watch \
|
||||||
|
watchdogd \
|
||||||
wicontrol \
|
wicontrol \
|
||||||
yp_mkdb \
|
yp_mkdb \
|
||||||
ypbind \
|
ypbind \
|
||||||
|
8
usr.sbin/watchdogd/Makefile
Normal file
8
usr.sbin/watchdogd/Makefile
Normal file
@ -0,0 +1,8 @@
|
|||||||
|
# $FreeBSD$
|
||||||
|
|
||||||
|
PROG= watchdogd
|
||||||
|
SRCS= watchdogd.c
|
||||||
|
MAN= watchdogd.8
|
||||||
|
WARNS= 6
|
||||||
|
|
||||||
|
.include <bsd.prog.mk>
|
97
usr.sbin/watchdogd/watchdogd.8
Normal file
97
usr.sbin/watchdogd/watchdogd.8
Normal file
@ -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 .
|
232
usr.sbin/watchdogd/watchdogd.c
Normal file
232
usr.sbin/watchdogd/watchdogd.c
Normal file
@ -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 */
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
Loading…
Reference in New Issue
Block a user