[binutils.git] / gprof / hertz.c

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that: (1) source distributions retain this entire copyright
 * notice and comment, and (2) distributions including binaries display
 * the following acknowledgement:  ``This product includes software
 * developed by the University of California, Berkeley and its contributors''
 * in the documentation or other materials provided with the distribution
 * and in all advertising materials mentioning features or use of this
 * software. 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static char sccsid[] = "@(#)hertz.c	5.4 (Berkeley) 6/1/90";
#endif /* not lint */

#include <sys/time.h>

    /*
     *	discover the tick frequency of the machine
     *	if something goes wrong, we return 0, an impossible hertz.
     */
#define	HZ_WRONG	0

hertz()
{
	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(HZ_WRONG);
	return (1000000 / tim.it_interval.tv_usec);
}
Commit	Line	Data
3d6c6501 SEF	1	/*
	2	* Copyright (c) 1983 Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms are permitted
	6	* provided that: (1) source distributions retain this entire copyright
	7	* notice and comment, and (2) distributions including binaries display
	8	* the following acknowledgement: ``This product includes software
	9	* developed by the University of California, Berkeley and its contributors''
	10	* in the documentation or other materials provided with the distribution
	11	* and in all advertising materials mentioning features or use of this
	12	* software. Neither the name of the University nor the names of its
	13	* contributors may be used to endorse or promote products derived
	14	* from this software without specific prior written permission.
	15	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
	16	* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
	17	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
	18	*/
	19
	20	#ifndef lint
	21	static char sccsid[] = "@(#)hertz.c 5.4 (Berkeley) 6/1/90";
	22	#endif /* not lint */
	23
	24	#include <sys/time.h>
	25
	26	/*
	27	* discover the tick frequency of the machine
	28	* if something goes wrong, we return 0, an impossible hertz.
	29	*/
	30	#define HZ_WRONG 0
	31
	32	hertz()
	33	{
	34	struct itimerval tim;
	35
	36	tim.it_interval.tv_sec = 0;
	37	tim.it_interval.tv_usec = 1;
	38	tim.it_value.tv_sec = 0;
	39	tim.it_value.tv_usec = 0;
	40	setitimer(ITIMER_REAL, &tim, 0);
	41	setitimer(ITIMER_REAL, 0, &tim);
	42	if (tim.it_interval.tv_usec < 2)
	43	return(HZ_WRONG);
	44	return (1000000 / tim.it_interval.tv_usec);
	45	}