/*

 * Copyright (c) 1983, 1993

 *      The Regents of the University of California.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 */

#include "gprof.h"

#include "hertz.h"

int

hertz (void)

{

#ifdef HERTZ

  return HERTZ;

#else /* ! defined (HERTZ) */

#ifdef HAVE_SETITIMER

  struct itimerval tim;

  tim.it_interval.tv_sec = 0;

  tim.it_interval.tv_usec = 1;

  tim.it_value.tv_sec = 0;

  tim.it_value.tv_usec = 0;

  setitimer (ITIMER_REAL, &tim, 0);

  setitimer (ITIMER_REAL, 0, &tim);

  if (tim.it_interval.tv_usec >= 2)

    {

      return 1000000 / tim.it_interval.tv_usec;

    }

#endif /* ! defined (HAVE_SETITIMER) */

#if defined (HAVE_SYSCONF) && defined (_SC_CLK_TCK)

  return sysconf (_SC_CLK_TCK);

#else /* ! defined (HAVE_SYSCONF) || ! defined (_SC_CLK_TCK) */

#ifdef __MSDOS__

  return 18;

#else  /* ! defined (__MSDOS__) */

  return HZ_WRONG;

#endif /* ! defined (__MSDOS__) */

#endif /* ! defined (HAVE_SYSCONF) || ! defined (_SC_CLK_TCK) */

#endif /* ! defined (HERTZ) */

}