Annotation of sys/kern/kern_watchdog.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: kern_watchdog.c,v 1.7 2006/12/21 12:47:57 mbalmer Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 2003 Markus Friedl. All rights reserved.
! 5: *
! 6: * Redistribution and use in source and binary forms, with or without
! 7: * modification, are permitted provided that the following conditions
! 8: * are met:
! 9: * 1. Redistributions of source code must retain the above copyright
! 10: * notice, this list of conditions and the following disclaimer.
! 11: * 2. Redistributions in binary form must reproduce the above copyright
! 12: * notice, this list of conditions and the following disclaimer in the
! 13: * documentation and/or other materials provided with the distribution.
! 14: *
! 15: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 16: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 17: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 18: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
! 19: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
! 20: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 21: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 22: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 23: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
! 24: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 25: */
! 26: #include <sys/param.h>
! 27: #include <sys/kernel.h>
! 28: #include <sys/systm.h>
! 29: #include <sys/sysctl.h>
! 30: #include <sys/time.h>
! 31:
! 32: void wdog_tickle(void *arg);
! 33: void wdog_shutdown(void *arg);
! 34: int (*wdog_ctl_cb)(void *, int) = NULL;
! 35: void *wdog_ctl_cb_arg = NULL;
! 36: int wdog_period = 0;
! 37: int wdog_auto = 1;
! 38: void *wdog_cookie;
! 39: struct timeout wdog_timeout;
! 40:
! 41: void
! 42: wdog_register(void *cb_arg, int (*cb)(void *, int))
! 43: {
! 44: if (wdog_ctl_cb != NULL)
! 45: return;
! 46:
! 47: wdog_ctl_cb = cb;
! 48: wdog_ctl_cb_arg = cb_arg;
! 49: timeout_set(&wdog_timeout, wdog_tickle, NULL);
! 50: wdog_cookie = shutdownhook_establish(wdog_shutdown, NULL);
! 51: }
! 52:
! 53: void
! 54: wdog_tickle(void *arg)
! 55: {
! 56: if (wdog_ctl_cb == NULL)
! 57: return;
! 58: (void) (*wdog_ctl_cb)(wdog_ctl_cb_arg, wdog_period);
! 59: timeout_add(&wdog_timeout, wdog_period * hz / 2);
! 60: }
! 61:
! 62: void
! 63: wdog_shutdown(void *arg)
! 64: {
! 65: if (wdog_ctl_cb == NULL)
! 66: return;
! 67: timeout_del(&wdog_timeout);
! 68: (void) (*wdog_ctl_cb)(wdog_ctl_cb_arg, 0);
! 69: wdog_ctl_cb = NULL;
! 70: wdog_period = 0;
! 71: wdog_auto = 1;
! 72: }
! 73:
! 74: int
! 75: sysctl_wdog(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp,
! 76: size_t newlen)
! 77: {
! 78: int error, period;
! 79:
! 80: if (wdog_ctl_cb == NULL)
! 81: return (EOPNOTSUPP);
! 82:
! 83: switch (name[0]) {
! 84: case KERN_WATCHDOG_PERIOD:
! 85: period = wdog_period;
! 86: error = sysctl_int(oldp, oldlenp, newp, newlen, &period);
! 87: if (error)
! 88: return (error);
! 89: if (newp) {
! 90: timeout_del(&wdog_timeout);
! 91: wdog_period = (*wdog_ctl_cb)(wdog_ctl_cb_arg, period);
! 92: }
! 93: break;
! 94: case KERN_WATCHDOG_AUTO:
! 95: error = sysctl_int(oldp, oldlenp, newp, newlen, &wdog_auto);
! 96: if (error)
! 97: return (error);
! 98: if (wdog_auto && wdog_cookie == NULL)
! 99: wdog_cookie = shutdownhook_establish(wdog_shutdown,
! 100: NULL);
! 101: else if (!wdog_auto && wdog_cookie) {
! 102: shutdownhook_disestablish(wdog_cookie);
! 103: wdog_cookie = NULL;
! 104: }
! 105: break;
! 106: default:
! 107: return (EINVAL);
! 108: }
! 109:
! 110: if (wdog_auto && wdog_period > 0) {
! 111: (void) (*wdog_ctl_cb)(wdog_ctl_cb_arg, wdog_period);
! 112: timeout_add(&wdog_timeout, wdog_period * hz / 2);
! 113: } else
! 114: timeout_del(&wdog_timeout);
! 115:
! 116: return (error);
! 117: }
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