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-<table class="head">
- <tr>
- <td class="head-ltitle">SWWDOG(4)</td>
- <td class="head-vol">Device Drivers Manual</td>
- <td class="head-rtitle">SWWDOG(4)</td>
- </tr>
-</table>
-<div class="manual-text">
-<section class="Sh">
-<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
-<p class="Pp"><code class="Nm">swwdog</code> &#x2014; <span class="Nd">software
- watchdog timer</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp"><code class="Cd">pseudo-device swwdog</code></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">The <code class="Nm">swwdog</code> driver provides a software
- watchdog timer that works with <a class="Xr">wdogctl(8)</a>. If the timer
- expires, the system reboots if the boolean variable
- <var class="Va">swwdog_reboot</var> is <code class="Dv">true</code>;
- otherwise, the system will panic. <var class="Va">swwdog_reboot</var> is
- accessible as the <a class="Xr">sysctl(8)</a> variable hw.swwdog.reboot and
- defaults to <code class="Dv">false</code>.</p>
-<p class="Pp">The default period of <code class="Nm">swwdog</code> is 60
- seconds.</p>
-<p class="Pp">As with other watchdog timers, the <code class="Nm">swwdog</code>
- driver prevents a system from suspending when the watchdog is armed.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
- ALSO</a></h1>
-<p class="Pp"><a class="Xr">sysctl(8)</a>, <a class="Xr">wdogctl(8)</a></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="HISTORY"><a class="permalink" href="#HISTORY">HISTORY</a></h1>
-<p class="Pp">The <code class="Nm">swwdog</code> driver was written by
- <span class="An">Steven M. Bellovin</span>.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="BUGS"><a class="permalink" href="#BUGS">BUGS</a></h1>
-<p class="Pp">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 <code class="Nm">swwdog</code> device can be
- created.</p>
-<p class="Pp">Kernel tickle mode is useless with <code class="Nm">swwdog</code>
- 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.</p>
-<p class="Pp">The alarm option to <a class="Xr">wdogctl(8)</a> isn't
- implemented.</p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">June 8, 2011</td>
- <td class="foot-os">NetBSD 10.1</td>
- </tr>
-</table>