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/* $OpenBSD: timer.c,v 1.6 2016/08/27 01:30:39 guenther Exp $ */
/*
* Copyright (c) 2005 Håkan Olsson. 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.
*/
/*
* This code was written under funding by Multicom Security AB.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <stdlib.h>
#include <string.h>
#include "sasyncd.h"
/*
* All events have a name, an expiration time and a function to be called
* at this time. The queue is always sorted so the next event to happen is
* first in the queue.
*/
struct event {
TAILQ_ENTRY (event) next;
struct timeval expire;
char *name;
void (*fun) (void *);
void *arg;
};
static TAILQ_HEAD (event_head, event) events;
/* Initialize timer event queue. */
void
timer_init(void)
{
TAILQ_INIT(&events);
}
/*
* Return the number of seconds until the next event happens. Used for
* the select() call in the main loop.
*/
void
timer_next_event(struct timeval *tv)
{
struct timeval now;
struct event *e = TAILQ_FIRST(&events);
if (e) {
gettimeofday(&now, 0);
if (timercmp(&now, &e->expire, >=))
timerclear(tv);
else
timersub(&e->expire, &now, tv);
} else {
tv->tv_sec = 60; /* "Best guess". */
tv->tv_usec = 0;
}
}
/*
* Whenever select() times out, we have an event that should happen and this
* routine gets called. Handle and remove all pending events.
*/
void
timer_run(void)
{
struct timeval now;
struct event *e;
gettimeofday(&now, 0);
for (e = TAILQ_FIRST(&events); e && timercmp(&now, &e->expire, >=);
e = TAILQ_FIRST(&events)) {
TAILQ_REMOVE(&events, e, next);
log_msg(2, "timer_run: event \"%s\"",
e->name ? e->name : "<unknown>");
(*e->fun)(e->arg);
if (e->name)
free(e->name);
free(e);
}
}
/* Add a new event. */
int
timer_add(char *name, u_int32_t when, void (*function)(void *), void *arg)
{
struct timeval now, tmp;
struct event *e, *new;
new = calloc(1, sizeof *new);
if (!new) {
log_err("timer_add: calloc (1, %zu) failed", sizeof *new);
return -1;
}
new->name = strdup(name); /* We handle failures here. */
new->fun = function;
new->arg = arg;
memset(&tmp, 0, sizeof tmp);
tmp.tv_sec = when;
gettimeofday(&now, 0);
timeradd(&now, &tmp, &new->expire);
log_msg(2, "timer_add: new event \"%s\" (expiring in %us)",
name ? name : "<unknown>", when);
/* Insert the new event in the queue so it's always sorted. */
for (e = TAILQ_FIRST(&events); e; e = TAILQ_NEXT(e, next)) {
if (timercmp(&new->expire, &e->expire, >=))
continue;
TAILQ_INSERT_BEFORE(e, new, next);
return 0;
}
TAILQ_INSERT_TAIL(&events, new, next);
return 0;
}
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