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swwdog(4) [netbsd man page]

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

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.swwdog.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 sin- gle 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

Check Out this Related Man Page

ntwdt(7D)																 ntwdt(7D)

ntwdt - Netra--based application watchdog timer driver SYNOPSIS
/dev/ntwdt The ntwdt driver is a multithreaded, loadable, non-STREAMS pseudo driver that provides an application with an interface for controlling a system watchdog timer. The ntwdt driver implements a virtual watchdog timer that a privileged application (Effective UID == 0) controls via IOCTLs. CONFIGURATION
You configure the ntwdt driver by modifying the contents of the ntwdt.conf file. ERRORS
An open() fails if: EPERM Effective user ID is not zero. ENOENT /dev/ntwdt is not present or driver is not installed. EAGAIN /dev/ntwdt has already been successfully open()'d. FILES
/dev/ntwdt Special character device. kernel/drv/sparcv9/ntwdt SPARC ntwdt driver binary. kernel/drv/ntwdt.conf Driver configuraton file. See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcakr.u | +-----------------------------+-----------------------------+ |Architecture |SPARC | +-----------------------------+-----------------------------+ driver.conf(4), attributes(5) Writing Device Drivers 05 Feb 2005 ntwdt(7D)
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