78 lines
2.3 KiB
Groff
78 lines
2.3 KiB
Groff
|
|
||
|
|
.\" 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 .
|