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/* $OpenBSD: kern_watchdog.c,v 1.7 2006/12/21 12:47:57 mbalmer Exp $ */
/*
* Copyright (c) 2003 Markus Friedl. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/time.h>
void wdog_tickle(void *arg);
void wdog_shutdown(void *arg);
int (*wdog_ctl_cb)(void *, int) = NULL;
void *wdog_ctl_cb_arg = NULL;
int wdog_period = 0;
int wdog_auto = 1;
void *wdog_cookie;
struct timeout wdog_timeout;
void
wdog_register(void *cb_arg, int (*cb)(void *, int))
{
if (wdog_ctl_cb != NULL)
return;
wdog_ctl_cb = cb;
wdog_ctl_cb_arg = cb_arg;
timeout_set(&wdog_timeout, wdog_tickle, NULL);
wdog_cookie = shutdownhook_establish(wdog_shutdown, NULL);
}
void
wdog_tickle(void *arg)
{
if (wdog_ctl_cb == NULL)
return;
(void) (*wdog_ctl_cb)(wdog_ctl_cb_arg, wdog_period);
timeout_add(&wdog_timeout, wdog_period * hz / 2);
}
void
wdog_shutdown(void *arg)
{
if (wdog_ctl_cb == NULL)
return;
timeout_del(&wdog_timeout);
(void) (*wdog_ctl_cb)(wdog_ctl_cb_arg, 0);
wdog_ctl_cb = NULL;
wdog_period = 0;
wdog_auto = 1;
}
int
sysctl_wdog(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp,
size_t newlen)
{
int error, period;
if (wdog_ctl_cb == NULL)
return (EOPNOTSUPP);
switch (name[0]) {
case KERN_WATCHDOG_PERIOD:
period = wdog_period;
error = sysctl_int(oldp, oldlenp, newp, newlen, &period);
if (error)
return (error);
if (newp) {
timeout_del(&wdog_timeout);
wdog_period = (*wdog_ctl_cb)(wdog_ctl_cb_arg, period);
}
break;
case KERN_WATCHDOG_AUTO:
error = sysctl_int(oldp, oldlenp, newp, newlen, &wdog_auto);
if (error)
return (error);
if (wdog_auto && wdog_cookie == NULL)
wdog_cookie = shutdownhook_establish(wdog_shutdown,
NULL);
else if (!wdog_auto && wdog_cookie) {
shutdownhook_disestablish(wdog_cookie);
wdog_cookie = NULL;
}
break;
default:
return (EINVAL);
}
if (wdog_auto && wdog_period > 0) {
(void) (*wdog_ctl_cb)(wdog_ctl_cb_arg, wdog_period);
timeout_add(&wdog_timeout, wdog_period * hz / 2);
} else
timeout_del(&wdog_timeout);
return (error);
}
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