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WATCHDOG(4) BSD Kernel Interfaces Manual WATCHDOG(4) NAME watchdog -- hardware and software watchdog SYNOPSIS options CPU_ELAN options CPU_GEODE options SW_WATCHDOG #include <sys/watchdog.h> DESCRIPTION The watchdog facility is used for controlling hardware and software watchdogs. The interface is through a device named "/dev/" _PATH_WATCHDOG which re- sponds to a single ioctl(2) call, WDIOCPATPAT. The call takes a single argument which represents a timeout value speci- fied as an integer power of two nanoseconds. The WD_ACTIVE flag signals that the watchdog will be kept from timing out from userland, for instance by the watchdogd(8) daemon. To disable the watchdogs, an argument of zero should be used. The ioctl(2) call will return success if just one of the available watchdog(9) implementations support the request. If the call fails, for instance if none of watchdog(9) implementations support the timeout length, all watchdogs are disabled and must be explicitly re-enabled. EXAMPLES u_int u = WD_ACTIVE | WD_TO_8SEC; int fd = open("/dev/" _PATH_WATCHDOG, O_RDWR); ioctl(fd, WDIOCPATPAT, &u); SEE ALSO watchdogd(8), watchdog(9) HISTORY The watchdog code first appeared in FreeBSD 5.1. AUTHORS The watchdog facility was written by Poul-Henning Kamp <phk@FreeBSD.org>. The software watchdog code and this manual page were written by Sean Kelly <smkelly@FreeBSD.org>. Some contributions were made by Jeff Roberson <jeff@FreeBSD.org>. BSD June 25, 2003 BSD
NAME | SYNOPSIS | DESCRIPTION | EXAMPLES | SEE ALSO | HISTORY | AUTHORS
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