109 lines
3.1 KiB
C
109 lines
3.1 KiB
C
/* $OpenBSD: kern_watchdog.c,v 1.16 2022/08/14 01:58:27 jsg Exp $ */
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/*
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* Copyright (c) 2003 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/timeout.h>
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#include <sys/sysctl.h>
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void wdog_tickle(void *arg);
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int (*wdog_ctl_cb)(void *, int) = NULL;
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void *wdog_ctl_cb_arg = NULL;
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int wdog_period = 0;
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int wdog_auto = 1;
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struct timeout wdog_timeout;
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void
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wdog_register(int (*cb)(void *, int), void *cb_arg)
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{
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if (wdog_ctl_cb != NULL)
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return;
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wdog_ctl_cb = cb;
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wdog_ctl_cb_arg = cb_arg;
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timeout_set(&wdog_timeout, wdog_tickle, NULL);
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}
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void
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wdog_tickle(void *arg)
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{
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if (wdog_ctl_cb == NULL)
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return;
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(void) (*wdog_ctl_cb)(wdog_ctl_cb_arg, wdog_period);
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timeout_add_msec(&wdog_timeout, wdog_period * 1000 / 2);
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}
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void
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wdog_shutdown(void *arg)
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{
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if (wdog_ctl_cb == NULL || wdog_ctl_cb_arg != arg)
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return;
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timeout_del(&wdog_timeout);
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(void) (*wdog_ctl_cb)(wdog_ctl_cb_arg, 0);
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wdog_ctl_cb = NULL;
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wdog_period = 0;
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wdog_auto = 1;
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}
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int
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sysctl_wdog(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp,
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size_t newlen)
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{
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int error, period;
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if (wdog_ctl_cb == NULL)
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return (EOPNOTSUPP);
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switch (name[0]) {
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case KERN_WATCHDOG_PERIOD:
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period = wdog_period;
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error = sysctl_int_bounded(oldp, oldlenp, newp, newlen,
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&period, 0, INT_MAX);
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if (error)
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return (error);
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if (newp) {
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timeout_del(&wdog_timeout);
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wdog_period = (*wdog_ctl_cb)(wdog_ctl_cb_arg, period);
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}
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break;
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case KERN_WATCHDOG_AUTO:
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error = sysctl_int_bounded(oldp, oldlenp, newp, newlen,
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&wdog_auto, 0, 1);
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if (error)
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return (error);
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break;
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default:
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return (EINVAL);
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}
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if (wdog_auto && wdog_period > 0) {
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(void) (*wdog_ctl_cb)(wdog_ctl_cb_arg, wdog_period);
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timeout_add_msec(&wdog_timeout, wdog_period * 1000 / 2);
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} else
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timeout_del(&wdog_timeout);
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return (error);
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}
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