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NetBSD/share/man/man4/swwdog.4

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Correct description for hw.swwdog.reboot behaviour.
2011-06-08 16:19:14 +04:00
.\" $NetBSD: swwdog.4,v 1.8 2011/06/08 12:19:14 pgoyette Exp $
Add a software watchdog timer facility. Because this slightly changes the "tickle" model of wdogctl(8), it was modified as well; while I was in there, I cleaned up the argument parsing. The code was reviewed by simonb@.
2005-01-10 01:51:32 +03:00
.\"
.\" 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.
.\"
Correct description for hw.swwdog.reboot behaviour.
2011-06-08 16:19:14 +04:00
.Dd June 8, 2011
Add a software watchdog timer facility. Because this slightly changes the "tickle" model of wdogctl(8), it was modified as well; while I was in there, I cleaned up the argument parsing. The code was reviewed by simonb@.
2005-01-10 01:51:32 +03:00
.\" Written by Steven M. Bellovin
Fix Dd argument; fix typo in .Dt; new sentence, new line; use .An for author name.
2005-01-11 14:32:11 +03:00
.Dt SWWDOG 4
Add a software watchdog timer facility. Because this slightly changes the "tickle" model of wdogctl(8), it was modified as well; while I was in there, I cleaned up the argument parsing. The code was reviewed by simonb@.
2005-01-10 01:51:32 +03:00
.Os
.Sh NAME
.Nm swwdog
.Nd software watchdog timer
.Sh SYNOPSIS
Make swwdog use no-needs-count. As the manpage says, there can be only one.
2010-01-31 00:55:28 +03:00
.Cd "pseudo-device swwdog"
Add a software watchdog timer facility. Because this slightly changes the "tickle" model of wdogctl(8), it was modified as well; while I was in there, I cleaned up the argument parsing. The code was reviewed by simonb@.
2005-01-10 01:51:32 +03:00
.Sh DESCRIPTION
The
.Nm
driver provides a software watchdog timer that works with
.Xr wdogctl 8 .
Correct description for hw.swwdog.reboot behaviour.
2011-06-08 16:19:14 +04:00
If the timer expires, the system reboots if the boolean variable
.Va swwdog_reboot
Convert swwdog(4) from a simple defpseudo device to a defpseudodev so that we can attach a power management handler. The handler prevents a suspend if the watchdog is active, to be consistent with other watchdog drivers. As discussed on tech-kern.
2010-07-22 18:10:14 +04:00
is
.Dv true ;
Correct description for hw.swwdog.reboot behaviour.
2011-06-08 16:19:14 +04:00
otherwise, the system will panic.
Convert swwdog(4) from a simple defpseudo device to a defpseudodev so that we can attach a power management handler. The handler prevents a suspend if the watchdog is active, to be consistent with other watchdog drivers. As discussed on tech-kern.
2010-07-22 18:10:14 +04:00
.Va swwdog_reboot
is accessible as a
.Xr sysctl 8
Correct description for hw.swwdog.reboot behaviour.
2011-06-08 16:19:14 +04:00
variable, hw.swwdog.reboot and defaults to
Convert swwdog(4) from a simple defpseudo device to a defpseudodev so that we can attach a power management handler. The handler prevents a suspend if the watchdog is active, to be consistent with other watchdog drivers. As discussed on tech-kern.
2010-07-22 18:10:14 +04:00
.Dv false .
Add a software watchdog timer facility. Because this slightly changes the "tickle" model of wdogctl(8), it was modified as well; while I was in there, I cleaned up the argument parsing. The code was reviewed by simonb@.
2005-01-10 01:51:32 +03:00
.Pp
The default period of
.Nm
is 60 seconds.
Convert swwdog(4) from a simple defpseudo device to a defpseudodev so that we can attach a power management handler. The handler prevents a suspend if the watchdog is active, to be consistent with other watchdog drivers. As discussed on tech-kern.
2010-07-22 18:10:14 +04:00
.Pp
As with other watchdog timers, the
.Nm
driver prevents a system from suspending when the watchdog is armed.
Add a software watchdog timer facility. Because this slightly changes the "tickle" model of wdogctl(8), it was modified as well; while I was in there, I cleaned up the argument parsing. The code was reviewed by simonb@.
2005-01-10 01:51:32 +03:00
.Sh SEE ALSO
Add comma in enumeration.
2010-07-22 23:27:51 +04:00
.Xr sysctl 8 ,
Add a software watchdog timer facility. Because this slightly changes the "tickle" model of wdogctl(8), it was modified as well; while I was in there, I cleaned up the argument parsing. The code was reviewed by simonb@.
2005-01-10 01:51:32 +03:00
.Xr wdogctl 8
.Sh HISTORY
The
.Nm
Fix Dd argument; fix typo in .Dt; new sentence, new line; use .An for author name.
2005-01-11 14:32:11 +03:00
driver was written by
.An Steven M. Bellovin .
Add a software watchdog timer facility. Because this slightly changes the "tickle" model of wdogctl(8), it was modified as well; while I was in there, I cleaned up the argument parsing. The code was reviewed by simonb@.
2005-01-10 01:51:32 +03:00
.Sh BUGS
Make swwdog use no-needs-count. As the manpage says, there can be only one.
2010-01-31 00:55:28 +03:00
Only one watchdog timer can be active at any given time.
Convert swwdog(4) from a simple defpseudo device to a defpseudodev so that we can attach a power management handler. The handler prevents a suspend if the watchdog is active, to be consistent with other watchdog drivers. As discussed on tech-kern.
2010-07-22 18:10:14 +04:00
(Arguably, this is a bug in the watchdog timer framework.)
Therefore, only a single instance of the
.Nm
device can be created.
Add a software watchdog timer facility. Because this slightly changes the "tickle" model of wdogctl(8), it was modified as well; while I was in there, I cleaned up the argument parsing. The code was reviewed by simonb@.
2005-01-10 01:51:32 +03:00
.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.
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