clock.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/* Copyright (c) 1988 AT&T */
/* All Rights Reserved */
#include "synonyms.h"
#include <sys/types.h>
#include <sys/times.h>
#include <time.h>
#include <sys/param.h> /* for HZ (clock frequency in Hz) */
#define TIMES(B) (B.tms_utime+B.tms_stime+B.tms_cutime+B.tms_cstime)
clock_t
clock(void)
{
struct tms buffer;
static int Hz = 0;
static clock_t first;
extern int gethz(void); /* XXX should be in a header file! */
if (times(&buffer) == (clock_t)-1)
return ((clock_t)-1);
if (Hz == 0) {
if ((Hz = gethz()) == 0)
Hz = HZ;
first = TIMES(buffer);
}
return ((TIMES(buffer) - first) * (CLOCKS_PER_SEC/Hz));
}