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provide timer_nextduein, which provides the number of seconds until the
next timer expires.
use that in the session engine's mainloop, which simplifies it and
removes the last bits of timer internals knowledge from anywhere outside
timer.c.

/*	$OpenBSD: timer.c,v 1.4 2007/12/23 18:56:17 henning Exp $ */

/*
 * Copyright (c) 2003-2007 Henning Brauer <henning@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/param.h>
#include <sys/types.h>

#include "bgpd.h"
#include "session.h"

time_t *
timer_get(struct peer *p, enum Timer timer)
{
	switch (timer) {
	case Timer_None:
		fatal("timer_get called with Timer_None");
	case Timer_ConnectRetry:
		return (&p->ConnectRetryTimer);
	case Timer_Keepalive:
		return (&p->KeepaliveTimer);
	case Timer_Hold:
		return (&p->HoldTimer);
	case Timer_IdleHold:
		return (&p->IdleHoldTimer);
	case Timer_IdleHoldReset:
		return (&p->IdleHoldResetTimer);
	case Timer_Max:
		fatal("timer_get called with Timer_Max");
	}

	fatal("King Bula lost in time");
}

int
timer_due(struct peer *p, enum Timer timer)
{
	time_t	*t = timer_get(p, timer);

	if (t != NULL && *t > 0 && *t <= time(NULL))
		return (1);
	return (0);
}

time_t
timer_nextduein(struct peer *p)
{
	u_int	i;
	time_t	d, r = -1;

	for (i = 1; i < Timer_Max; i++)
		if (timer_running(p, i, &d))
			if (r == -1 || d < r)
				r = d;

	return (r);
}

int
timer_running(struct peer *p, enum Timer timer, time_t *left)
{
	time_t	*t = timer_get(p, timer);

	if (t != NULL && *t > 0) {
		if (left != NULL)
			*left = *t - time(NULL);
		return (1);
	}
	return (0);
}

void
timer_set(struct peer *p, enum Timer timer, u_int offset)
{
	time_t	*t = timer_get(p, timer);

	*t = time(NULL) + offset;
}

void
timer_stop(struct peer *p, enum Timer timer)
{
	time_t	*t = timer_get(p, timer);

	if (t != NULL)
		*t = 0;
}