path: root/shaper.c

/*
 *  OpenVPN -- An application to securely tunnel IP networks
 *             over a single UDP port, with support for SSL/TLS-based
 *             session authentication and key exchange,
 *             packet encryption, packet authentication, and
 *             packet compression.
 *
 *  Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
 *
 *  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.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program (see the file COPYING included with this
 *  distribution); if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "syshead.h"
#include "shaper.h"
#include "memdbg.h"

#ifdef HAVE_GETTIMEOFDAY

/*
 * We want to wake up in delay microseconds.  If timeval is larger
 * than delay, set timeval to delay.
 */
bool
shaper_soonest_event (struct timeval *tv, int delay)
{
  bool ret = false;
  if (delay < 1000000)
    {
      if (tv->tv_sec)
	{
	  tv->tv_sec = 0;
	  tv->tv_usec = delay;
	  ret = true;
	}
      else if (delay < tv->tv_usec)
	{
	  tv->tv_usec = delay;
	  ret = true;
	}
    }
  else
    {
      const int sec = delay / 1000000;
      const int usec = delay % 1000000;

      if (sec < tv->tv_sec)
	{
	  tv->tv_sec = sec;
	  tv->tv_usec = usec;
	  ret = true;
	}
      else if (sec == tv->tv_sec)
	{
	  if (usec < tv->tv_usec)
	    {
	      tv->tv_usec = usec;
	      ret = true;
	    }
	}
    }
#ifdef SHAPER_DEBUG
  dmsg (D_SHAPER_DEBUG, "SHAPER shaper_soonest_event sec=%d usec=%d ret=%d",
       (int)tv->tv_sec, (int)tv->tv_usec, (int)ret);
#endif
  return ret;
}

void
shaper_reset_wakeup (struct shaper *s)
{
  CLEAR (s->wakeup);
}

void
shaper_msg (struct shaper *s)
{
  msg (M_INFO, "Output Traffic Shaping initialized at %d bytes per second",
       s->bytes_per_second);
}

#else
static void dummy(void) {}
#endif /* HAVE_GETTIMEOFDAY */