1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27/*	Copyright (c) 1988 AT&T	*/
28/*	  All Rights Reserved  	*/
29
30#pragma ident	"%Z%%M%	%I%	%E% SMI"
31
32#include "lint.h"
33#include <sys/types.h>
34#include <sys/times.h>
35#include <time.h>
36#include <sys/param.h>	/* for HZ (clock frequency in Hz) */
37
38#define	TIMES(B)	(B.tms_utime+B.tms_stime+B.tms_cutime+B.tms_cstime)
39
40
41clock_t
42clock(void)
43{
44	struct tms buffer;
45	static int Hz = 0;
46	static clock_t first;
47	extern int gethz(void);		/* XXX should be in a header file! */
48
49	if (times(&buffer) == (clock_t)-1)
50		return ((clock_t)-1);
51	if (Hz == 0) {
52		if ((Hz = gethz()) == 0)
53			Hz = HZ;
54		first = TIMES(buffer);
55	}
56
57	return ((TIMES(buffer) - first) * (CLOCKS_PER_SEC/Hz));
58}
59