/* $OpenBSD: timer.c,v 1.11 2013/04/30 12:30:40 florian Exp $ */ /* $KAME: timer.c,v 1.7 2002/05/21 14:26:55 itojun Exp $ */ /* * Copyright (C) 1998 WIDE Project. * 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. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``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 PROJECT OR CONTRIBUTORS 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 #include #include #include #include #include "timer.h" #include "log.h" SLIST_HEAD(, rtadvd_timer) timer_head = SLIST_HEAD_INITIALIZER(timer_head); struct rtadvd_timer * rtadvd_add_timer(void (*timeout)(void *), void (*update)(void *, struct timeval *), void *timeodata, void *updatedata) { struct rtadvd_timer *newtimer; if ((newtimer = malloc(sizeof(*newtimer))) == NULL) fatal("malloc"); memset(newtimer, 0, sizeof(*newtimer)); if (timeout == NULL) fatalx("timeout function unspecified"); if (update == NULL) fatalx("update function unspecified"); newtimer->expire = timeout; newtimer->update = update; newtimer->expire_data = timeodata; newtimer->update_data = updatedata; /* link into chain */ SLIST_INSERT_HEAD(&timer_head, newtimer, entries); return(newtimer); } void rtadvd_remove_timer(struct rtadvd_timer **timer) { SLIST_REMOVE(&timer_head, *timer, rtadvd_timer, entries); free(*timer); *timer = NULL; } void rtadvd_set_timer(struct timeval *tm, struct rtadvd_timer *timer) { struct timeval now; /* reset the timer */ gettimeofday(&now, NULL); timeradd(&now, tm, &timer->tm); } /* * Check expiration for each timer. If a timer is expired, * call the expire function for the timer and update the timer. * Return the next interval for select() call. */ struct timeval * rtadvd_check_timer() { static struct timeval returnval; struct timeval now; struct rtadvd_timer *tm; int timers; timers = 0; gettimeofday(&now, NULL); SLIST_FOREACH(tm, &timer_head, entries) { if (timercmp(&tm->tm, &now, <=)) { (*tm->expire)(tm->expire_data); (*tm->update)(tm->update_data, &tm->tm); timeradd(&tm->tm, &now, &tm->tm); } if (timers == 0 || timercmp(&tm->tm, &returnval, <)) returnval = tm->tm; timers ++; } if (timers == 0) { /* no need to timeout */ return(NULL); } else if (timercmp(&returnval, &now, <)) { /* this may occur when the interval is too small */ timerclear(&returnval); } else timersub(&returnval, &now, &returnval); return(&returnval); } struct timeval * rtadvd_timer_rest(struct rtadvd_timer *timer) { static struct timeval returnval, now; gettimeofday(&now, NULL); if (timercmp(&timer->tm, &now, <=)) { log_debug("a timer must be expired, but not yet"); timerclear(&returnval); } else timersub(&timer->tm, &now, &returnval); return(&returnval); }