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/*
* This file is part of the Nice GLib ICE library.
*
* (C) 2008-2009 Collabora Ltd.
* Contact: Youness Alaoui
* (C) 2007-2009 Nokia Corporation. All rights reserved.
* Contact: Rémi Denis-Courmont
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Nice GLib ICE library.
*
* The Initial Developers of the Original Code are Collabora Ltd and Nokia
* Corporation. All Rights Reserved.
*
* Contributors:
* Youness Alaoui, Collabora Ltd.
* Rémi Denis-Courmont, Nokia
*
* Alternatively, the contents of this file may be used under the terms of the
* the GNU Lesser General Public License Version 2.1 (the "LGPL"), in which
* case the provisions of LGPL are applicable instead of those above. If you
* wish to allow use of your version of this file only under the terms of the
* LGPL and not to allow others to use your version of this file under the
* MPL, indicate your decision by deleting the provisions above and replace
* them with the notice and other provisions required by the LGPL. If you do
* not delete the provisions above, a recipient may use your version of this
* file under either the MPL or the LGPL.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#else
#include <unistd.h>
#endif
#include "timer.h"
#include <stdlib.h> /* div() */
/*
* Clock used throughout the STUN code.
* STUN requires a monotonic 1kHz clock to operate properly.
*/
static void stun_gettime (struct timeval *now)
{
#ifdef _WIN32
FILETIME ft;
unsigned long long *time64 = (unsigned long long *) &ft;
GetSystemTimeAsFileTime (&ft);
/* Convert from 100s of nanoseconds since 1601-01-01
* to Unix epoch. Yes, this is Y2038 unsafe.
*/
*time64 -= (unsigned long long) 116444736000000000;
*time64 /= 10;
now->tv_sec = (long)(*time64 / 1000000);
now->tv_usec = *time64 % 1000000;
#else
#if defined (_POSIX_MONOTONIC_CLOCK) && (_POSIX_MONOTONIC_CLOCK >= 0)
struct timespec spec;
if (!clock_gettime (CLOCK_MONOTONIC, &spec)) {
now->tv_sec = spec.tv_sec;
now->tv_usec = spec.tv_nsec / 1000;
} else
#endif
{ // fallback to wall clock
gettimeofday (now, NULL);
}
#endif
}
static void set_delay (struct timeval *ts, unsigned delay)
{
stun_gettime (ts);
/* Delay is in ms. */
ts->tv_sec += delay / 1000;
ts->tv_usec += (delay % 1000) * 1000;
while (ts->tv_usec > 1000000)
{
ts->tv_usec -= 1000000;
ts->tv_sec++;
}
}
void stun_timer_start (StunTimer *timer, unsigned int initial_timeout,
unsigned int max_retransmissions)
{
timer->retransmissions = 1;
timer->delay = initial_timeout;
timer->max_retransmissions = max_retransmissions;
set_delay (&timer->deadline, timer->delay);
}
void stun_timer_start_reliable (StunTimer *timer, unsigned int initial_timeout)
{
stun_timer_start (timer, initial_timeout, 0);
}
unsigned stun_timer_remainder (const StunTimer *timer)
{
unsigned delay;
struct timeval now;
stun_gettime (&now);
if (now.tv_sec > timer->deadline.tv_sec)
return 0;
delay = timer->deadline.tv_sec - now.tv_sec;
if ((delay == 0) && (now.tv_usec >= timer->deadline.tv_usec))
return 0;
delay *= 1000;
delay += ((signed)(timer->deadline.tv_usec - now.tv_usec)) / 1000;
return delay;
}
StunUsageTimerReturn stun_timer_refresh (StunTimer *timer)
{
unsigned delay = stun_timer_remainder (timer);
if (delay == 0)
{
if (timer->retransmissions >= timer->max_retransmissions)
return STUN_USAGE_TIMER_RETURN_TIMEOUT;
if (timer->retransmissions == timer->max_retransmissions - 1)
timer->delay = timer->delay / 2;
else
timer->delay = timer->delay * 2;
set_delay (&timer->deadline, timer->delay);
timer->retransmissions++;
return STUN_USAGE_TIMER_RETURN_RETRANSMIT;
}
return STUN_USAGE_TIMER_RETURN_SUCCESS;
}
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