[deliverable/binutils-gdb.git] / gprof / hertz.c

/*
 * 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) */
}
Commit	Line	Data
	1	/*
	2	* Copyright (c) 1983, 1993
	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. Neither the name of the University nor the names of its contributors
	14	* may be used to endorse or promote products derived from this software
	15	* without specific prior written permission.
	16	*
	17	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	18	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	19	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	20	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	21	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	22	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	23	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	24	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	25	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	26	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	27	* SUCH DAMAGE.
	28	*/
	29	#include "gprof.h"
	30	#include "hertz.h"
	31
	32
	33	int
	34	hertz (void)
	35	{
	36	#ifdef HERTZ
	37	return HERTZ;
	38	#else /* ! defined (HERTZ) */
	39	#ifdef HAVE_SETITIMER
	40	struct itimerval tim;
	41
	42	tim.it_interval.tv_sec = 0;
	43	tim.it_interval.tv_usec = 1;
	44	tim.it_value.tv_sec = 0;
	45	tim.it_value.tv_usec = 0;
	46	setitimer (ITIMER_REAL, &tim, 0);
	47	setitimer (ITIMER_REAL, 0, &tim);
	48	if (tim.it_interval.tv_usec >= 2)
	49	{
	50	return 1000000 / tim.it_interval.tv_usec;
	51	}
	52	#endif /* ! defined (HAVE_SETITIMER) */
	53	#if defined (HAVE_SYSCONF) && defined (_SC_CLK_TCK)
	54	return sysconf (_SC_CLK_TCK);
	55	#else /* ! defined (HAVE_SYSCONF) \|\| ! defined (_SC_CLK_TCK) */
	56	#ifdef __MSDOS__
	57	return 18;
	58	#else /* ! defined (__MSDOS__) */
	59	return HZ_WRONG;
	60	#endif /* ! defined (__MSDOS__) */
	61	#endif /* ! defined (HAVE_SYSCONF) \|\| ! defined (_SC_CLK_TCK) */
	62	#endif /* ! defined (HERTZ) */
	63	}