/*

 * iSCSI timer

 *

 * Copyright (C) 2002 Cisco Systems, Inc.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published

 * by the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

 * General Public License for more details.

 *

 * See the file COPYING included with this distribution for more details.

 */

#include <string.h>

#include <sys/time.h>

void iscsi_timer_clear(struct timeval *timer)

{

	memset(timer, 0, sizeof (*timer));

}

/* set timer to now + seconds */

void iscsi_timer_set(struct timeval *timer, int seconds)

{

	if (timer) {

		memset(timer, 0, sizeof (*timer));

		gettimeofday(timer, NULL);

		timer->tv_sec += seconds;

	}

}

int iscsi_timer_expired(struct timeval *timer)

{

	struct timeval now;

	/* no timer, can't have expired */

	if ((timer == NULL) || ((timer->tv_sec == 0) && (timer->tv_usec == 0)))

		return 0;

	memset(&now, 0, sizeof (now));

	gettimeofday(&now, NULL);

	if (now.tv_sec > timer->tv_sec)

		return 1;

	if ((now.tv_sec == timer->tv_sec) && (now.tv_usec >= timer->tv_usec))

		return 1;

	return 0;

}

int iscsi_timer_msecs_until(struct timeval *timer)

{

	struct timeval now;

	int msecs;

	long partial;

	/* no timer, can't have expired, infinite time til it expires */

	if ((timer == NULL) || ((timer->tv_sec == 0) && (timer->tv_usec == 0)))

		return -1;

	memset(&now, 0, sizeof (now));

	gettimeofday(&now, NULL);

	/* already expired? */

	if (now.tv_sec > timer->tv_sec)

		return 0;

	if ((now.tv_sec == timer->tv_sec) && (now.tv_usec >= timer->tv_usec))

		return 0;

	/* not expired yet, do the math */

	partial = timer->tv_usec - now.tv_usec;

	if (partial < 0) {

		partial += 1000 * 1000;

		msecs = (partial + 500) / 1000;

		msecs += (timer->tv_sec - now.tv_sec - 1) * 1000;

	} else {

		msecs = (partial + 500) / 1000;

		msecs += (timer->tv_sec - now.tv_sec) * 1000;

	}

	return msecs;

}