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NetBSD 6.1.5 - man page for swwdog (netbsd section 4)

SWWDOG(4)			   BSD Kernel Interfaces Manual 			SWWDOG(4)

NAME
     swwdog -- software watchdog timer

SYNOPSIS
     pseudo-device swwdog

DESCRIPTION
     The swwdog driver provides a software watchdog timer that works with wdogctl(8).  If the
     timer expires, the system reboots if the boolean variable swwdog_reboot is true; otherwise,
     the system will panic.  swwdog_reboot is accessible as a sysctl(8) variable, hw.sww-
     dog.reboot and defaults to false.

     The default period of swwdog is 60 seconds.

     As with other watchdog timers, the swwdog driver prevents a system from suspending when the
     watchdog is armed.

SEE ALSO
     sysctl(8), wdogctl(8)

HISTORY
     The swwdog driver was written by Steven M. Bellovin.

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 swwdog device can be
     created.

     Kernel tickle mode is useless with swwdog 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.

     The alarm option to wdogctl(8) isn't implemented.

BSD					   June 8, 2011 				      BSD


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