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/*
* 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;
}
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