mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-16 10:20:30 +00:00
94 lines
2.9 KiB
Groff
94 lines
2.9 KiB
Groff
.\" Copyright (c) 2004 Poul-Henning Kamp <phk@FreeBSD.org>
|
|
.\" Copyright (c) 2003, 2004 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 Hardware and Software watchdog
|
|
.Sh SYNOPSIS
|
|
.Cd options CPU_ELAN
|
|
.Cd options CPU_GEODE
|
|
.Cd options SW_WATCHDOG
|
|
.Pp
|
|
.In sys/watchdog.h
|
|
.Bd -literal
|
|
|
|
u_int u = WD_ACTIVE | WD_8SEC;
|
|
int fd = open("/dev/" _PATH_WATCHDOG, O_RDWR);
|
|
|
|
ioctl(fd, WDIOCPATPAT, &u);
|
|
.Ed
|
|
.Sh DESCRIPTION
|
|
.Nm
|
|
is a facility for controlling hardware and software watchdog facilities.
|
|
.Pp
|
|
The interface is through a device named "/dev/"
|
|
.Dv _PATH_WATCHDOG
|
|
which
|
|
responds to a single ioctl call,
|
|
.Dv WDIOCPATPAT .
|
|
.Pp
|
|
The ioctl call takes an argument which consists of a timeout value
|
|
specified as an integer power of two nanoseconds.
|
|
.Pp
|
|
The
|
|
.Dv WD_ACTIVE
|
|
flag signals that the watchdog will be kept from
|
|
timing out from userland, for instance by the
|
|
.Xr watchdogd 8
|
|
daemon.
|
|
.Pp
|
|
To disable the watchdogs, use an argument of zero.
|
|
.Pp
|
|
The ioctl call will return success if just one of the available
|
|
watchdog implementations support the request.
|
|
If the ioctl fails, for instance if no watchdog supports the timeout
|
|
length, all watchdogs are disabled and must be explicitly reenabled.
|
|
.Sh SEE ALSO
|
|
.Xr watchdogd 8 ,
|
|
.Xr watchdog 9
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
code first appeared in
|
|
.Fx 5.1 .
|
|
.Sh AUTHORS
|
|
.An -nosplit
|
|
The
|
|
.Nm watchdog
|
|
facility were written by
|
|
.An Poul-Henning Kamp Aq phk@FreeBSD.org .
|
|
.Pp
|
|
The
|
|
.Nm SW_WATCHDOG
|
|
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 .
|