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+.\"	$NetBSD: swwdog.4,v 1.9 2015/04/14 10:50:25 pgoyette Exp $
+.\"
+.\" Copyright (c) 2004, 2005 Steven M. Bellovin
+.\" 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.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"        This product includes software developed by the NetBSD
+.\"        Foundation, Inc. and its contributors.
+.\" 4. Neither the name of the author nor the names of its
+.\"    contributors may be used to endorse or promote products derived
+.\"    from this software without specific prior written permission.
+.\"
+.\" 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.
+.\"
+.Dd June 8, 2011
+.\" Written by Steven M. Bellovin
+.Dt SWWDOG 4
+.Os
+.Sh NAME
+.Nm swwdog
+.Nd software watchdog timer
+.Sh SYNOPSIS
+.Cd "pseudo-device swwdog"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides a software watchdog timer that works with
+.Xr wdogctl 8 .
+If the timer expires, the system reboots if the boolean variable
+.Va swwdog_reboot
+is
+.Dv true ;
+otherwise, the system will panic.
+.Va swwdog_reboot
+is accessible as the
+.Xr sysctl 8
+variable hw.swwdog.reboot and defaults to
+.Dv false .
+.Pp
+The default period of
+.Nm
+is 60 seconds.
+.Pp
+As with other watchdog timers, the
+.Nm
+driver prevents a system from suspending when the watchdog is armed.
+.Sh SEE ALSO
+.Xr sysctl 8 ,
+.Xr wdogctl 8
+.Sh HISTORY
+The
+.Nm
+driver was written by
+.An Steven M. Bellovin .
+.Sh BUGS
+Only one watchdog timer can be active at any given time.
+(Arguably, this is a bug in the watchdog timer framework.)
+Therefore, only a single instance of the
+.Nm
+device can be created.
+.Pp
+Kernel tickle mode is useless with
+.Nm
+and arguably should be rejected, since both it and
+this driver rely on the same callout mechanism; if one is
+blocked, almost certainly the other is as well.
+.Pp
+The alarm option to
+.Xr wdogctl 8
+isn't implemented.