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Man Pages


Manual Reference Pages  -  WATCHDOG (9)

NAME

watchdog - software and hardware watchdog facility

CONTENTS

Synopsis
Description
See Also
Authors

SYNOPSIS


.In sys/watchdog.h void watchdog_fn void *private u_int cmd int *error EVENTHANDLER_REGISTER watchdog_list watchdog_fn private 0 EVENTHANDLER_DEREGISTER watchdog_list eventhandler_tag

DESCRIPTION

To implement a watchdog in software or hardware, only a single function needs to be written and registered on the global watchdog_list.

The function must examine the cmd argument and act on it as follows:

If cmd is zero, the watchdog must be disabled and the error argument left untouched. If the watchdog cannot be disabled, the error argument must be set to EOPNOTSUPP.

Else the watchdog should be reset and configured to a timeout of (1 <<(cmd & WD_INTERVAL)) nanoseconds or larger and the error argument be set to zero to signal arming of a watchdog.

If the watchdog cannot be configured to the proposed timeout, it must be disabled and the error argument left as is (to avoid hiding the arming of another watchdog).

There is no specification of what the watchdog should do when it times out, but a hardware reset or similar "drastic but certain" behaviour is recommended.

SEE ALSO

watchdog(4)

AUTHORS


.An -nosplit The watchdog facility and this manual page was written
.An Poul-Henning Kamp Aq phk@FreeBSD.org .
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