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+.\" Copyright (c) 2004  Poul-Henning Kamp <phk@FreeBSD.org>
+.\" 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 September 2, 2006
+.Dt WATCHDOGD 8
+.Os
+.Sh NAME
+.Nm watchdogd
+.Nd watchdog daemon
+.Sh SYNOPSIS
+.Nm
+.Op Fl d
+.Op Fl e Ar cmd
+.Op Fl I Ar file
+.Op Fl s Ar sleep
+.Op Fl t Ar timeout
+.Sh DESCRIPTION
+The
+.Nm
+utility interfaces with the kernel's 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
+If
+.Fl e Ar cmd
+is specified,
+.Nm
+will attempt to execute this command with
+.Xr system 3 ,
+and only if the command returns with a zero exit code will the
+watchdog be reset.
+If
+.Fl e Ar cmd
+is not specified, the daemon will perform a trivial file system
+check instead.
+.Pp
+The
+.Fl s Ar sleep
+argument can be used to control the sleep period between each execution
+of the check and defaults to one second.
+.Pp
+The
+.Fl t Ar timeout
+specifies the desired timeout period in seconds.
+The default timeout is 16 seconds.
+.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
+Do not fork.
+When this option is specified,
+.Nm
+will not fork into the background at startup.
+.El
+.Sh FILES
+.Bl -tag -width ".Pa /var/run/watchdogd.pid" -compact
+.It Pa /var/run/watchdogd.pid
+.El
+.Sh SEE ALSO
+.Xr watchdog 4 ,
+.Xr watchdog 8 ,
+.Xr watchdog 9
+.Sh HISTORY
+The
+.Nm
+utility appeared in
+.Fx 5.1 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+utility and manual page were written by
+.An Sean Kelly Aq smkelly@FreeBSD.org
+and
+.An Poul-Henning Kamp Aq phk@FreeBSD.org .
+.Pp
+Some contributions made by
+.An Jeff Roberson Aq jeff@FreeBSD.org .