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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 /dev/fido which responds to a single
     ioctl(2) call, WDIOCPATPAT.

     The call takes a single argument which represents a timeout value
     specified 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/fido", 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〉.