/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License (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 2008 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

/*	Copyright (c) 1988 AT&T	*/

/*	  All Rights Reserved  	*/

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include "lint.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));

}