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wbwd(4) [freebsd man page]

WBWD(4) 						   BSD Kernel Interfaces Manual 						   WBWD(4)

wbwd -- device driver for watchdog timer found on Winbond Super I/O chips SYNOPSIS
To compile this driver into the kernel, place the following line in your kernel configuration file: device wbwd Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): wbwd_load="YES" DESCRIPTION
The wbwd driver provides watchdog(4) support for the watchdog interrupt timer present on at least the following Winbond Super I/O chips: o 83627HF/F/HG/G Rev. G o 83627HF/F/HG/G Rev. J o 83627HF/F/HG/G Rev. UD-A o 83627DHG IC ver. 5 SYSCTL VARIABLES
The wbwd driver provides the following options as sysctl(8) variables. dev.wbwd.0.timeout_override This variable allows to program the timer to a value independent on the one provided by the watchdog(4) framework while still relying on the regular updates from e.g. watchdogd(8). This is particularly useful if your system provides multiple watchdogs and you want them to fire in a special sequence to trigger an NMI after a shorter period than the reset timeout for example. The value set must not be lower than the sleep time of watchdogd(8). A value of 0 disables this feature and the timeout value provided by watchdog(4) will be used. dev.wbwd.0.debug_verbose If set this sysctl will tell the driver to log its current state before and after the timer reset on each invocation from watchdog(9) to the kernel message buffer for debugging. dev.wbwd.0.debug This read-only value gives the state of some registers on last update. The wbwd driver also provides further sysctl options that are hidden by default. See the source code for more information. SEE ALSO
watchdog(4), device.hints(5), watchdog(8), watchdogd(8), watchdog(9) HISTORY
The wbwd driver first appeared in FreeBSD 10.0. AUTHORS
This manual page was written by Bjoern A. Zeeb <>. BSD
December 28, 2012 BSD

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WD_KEEPALIVE(8) 					      System Manager's Manual						   WD_KEEPALIVE(8)

wd_keepalive - a simplified software watchdog daemon SYNOPSIS
wd_keepalive [-c filename|--config-file filename] DESCRIPTION
This is a simplified version of the watchdog daemon. If configured so it only opens .IR /dev/watchdog , and keeps writing to it often enough to keep the kernel from resetting, at least once per minute. Each write delays the reboot time another minute. After a minute of inactivity the watchdog hardware will cause a reset. In the case of the software watchdog the ability to reboot will depend on the state of the machines and interrupts. The wd_keepalive daemon can be stopped without causing a reboot if the device /dev/watchdog is closed correctly, unless your kernel is com- piled with the CONFIG_WATCHDOG_NOWAYOUT option enabled. Under high system load wd_keepalive might be swapped out of memory and may fail to make it back in in time. Under these circumstances the Linux kernel will reset the machine. To make sure you won't get unnecessary reboots make sure you have the variable realtime set to yes in the configuration file watchdog.conf. This adds real time support to wd_keepalive: it will lock itself into memory and there should be no problem even under the highest of loads. On system running out of memory the kernel will try to free enough memory by killing process. The wd_keepalive daemon itself is exempted from this so-called out-of-memory killer. OPTIONS
Available command line options are the following: -c config-file, --config-file config-file Use config-file as the configuration file instead of the default /etc/watchdog.conf. FILES
/dev/watchdog The watchdog device. /var/run/ The pid file of the running wd_keepalive. SEE ALSO
watchdog.conf(5) watchdog(8) 4th Berkeley Distribution January 2005 WD_KEEPALIVE(8)
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