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370c3cb57c
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)
98 lines
2.8 KiB
Groff
98 lines
2.8 KiB
Groff
.\" 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 WATCHDOGD 8
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.Os
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.Sh NAME
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.Nm watchdogd
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.Nd Software watchdog daemon
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.Sh SYNOPSIS
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.Nm
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.Op Fl d
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.Op Fl I Ar file
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.Sh DESCRIPTION
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The
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.Nm
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utility interfaces with the kernel's software watchdog facility to ensure
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that the system is in a working state.
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If
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.Nm
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is unable to interface with the kernel over a specific timeout,
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the kernel will take actions to assist in debugging or restarting the computer.
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.Pp
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One possible circumstance which will cause a watchdog timeout is an interrupt
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storm.
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If this occurs,
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.Nm
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will no longer execute and thus the kernel's watchdog routines will take
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action after a configurable timeout.
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.Pp
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Upon receiving the
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.Dv SIGTERM
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or
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.Dv SIGINT
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signals,
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.Nm
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will first instruct the kernel to no longer perform watchdog checks and then
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will terminate.
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.Pp
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The
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.Nm
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utility recognizes the following runtime options:
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.Bl -tag -width ".Fl I Ar file"
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.It Fl I Ar file
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Write the process id of the
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.Nm
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utility in the specified file.
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.It Fl d
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Don't fork.
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When this option is specified,
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.Nm
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will not fork into the background at startup.
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.El
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.Sh FILES
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.Bl -tag -width "/var/run/watchdogd.pid" -compact
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.It Pa /var/run/watchdogd.pid
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.El
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.Sh SEE ALSO
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.Xr watchdog 4 ,
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.Xr sysctl 8
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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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utility and manual page were written by
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.An Sean Kelly Aq smkelly@FreeBSD.org .
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.Pp
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Some contributions made by
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.An Jeff Roberson Aq jeff@FreeBSD.org .
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.Sh HISTORY
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The
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.Nm
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utility appeared in
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.Fx 5.1 .
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