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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: }