xref: /onnv-gate/usr/src/lib/libc/port/gen/clock.c (revision 6812:febeba71273d)
10Sstevel@tonic-gate /*
20Sstevel@tonic-gate  * CDDL HEADER START
30Sstevel@tonic-gate  *
40Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*6812Sraf  * Common Development and Distribution License (the "License").
6*6812Sraf  * You may not use this file except in compliance with the License.
70Sstevel@tonic-gate  *
80Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
90Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
100Sstevel@tonic-gate  * See the License for the specific language governing permissions
110Sstevel@tonic-gate  * and limitations under the License.
120Sstevel@tonic-gate  *
130Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
140Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
150Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
160Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
170Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
180Sstevel@tonic-gate  *
190Sstevel@tonic-gate  * CDDL HEADER END
200Sstevel@tonic-gate  */
21*6812Sraf 
220Sstevel@tonic-gate /*
23*6812Sraf  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
240Sstevel@tonic-gate  * Use is subject to license terms.
250Sstevel@tonic-gate  */
260Sstevel@tonic-gate 
270Sstevel@tonic-gate /*	Copyright (c) 1988 AT&T	*/
280Sstevel@tonic-gate /*	  All Rights Reserved  	*/
290Sstevel@tonic-gate 
30*6812Sraf #pragma ident	"%Z%%M%	%I%	%E% SMI"
310Sstevel@tonic-gate 
32*6812Sraf #include "lint.h"
330Sstevel@tonic-gate #include <sys/types.h>
340Sstevel@tonic-gate #include <sys/times.h>
350Sstevel@tonic-gate #include <time.h>
360Sstevel@tonic-gate #include <sys/param.h>	/* for HZ (clock frequency in Hz) */
370Sstevel@tonic-gate 
380Sstevel@tonic-gate #define	TIMES(B)	(B.tms_utime+B.tms_stime+B.tms_cutime+B.tms_cstime)
390Sstevel@tonic-gate 
400Sstevel@tonic-gate 
410Sstevel@tonic-gate clock_t
clock(void)420Sstevel@tonic-gate clock(void)
430Sstevel@tonic-gate {
440Sstevel@tonic-gate 	struct tms buffer;
450Sstevel@tonic-gate 	static int Hz = 0;
460Sstevel@tonic-gate 	static clock_t first;
470Sstevel@tonic-gate 	extern int gethz(void);		/* XXX should be in a header file! */
480Sstevel@tonic-gate 
490Sstevel@tonic-gate 	if (times(&buffer) == (clock_t)-1)
500Sstevel@tonic-gate 		return ((clock_t)-1);
510Sstevel@tonic-gate 	if (Hz == 0) {
520Sstevel@tonic-gate 		if ((Hz = gethz()) == 0)
530Sstevel@tonic-gate 			Hz = HZ;
540Sstevel@tonic-gate 		first = TIMES(buffer);
550Sstevel@tonic-gate 	}
560Sstevel@tonic-gate 
570Sstevel@tonic-gate 	return ((TIMES(buffer) - first) * (CLOCKS_PER_SEC/Hz));
580Sstevel@tonic-gate }
59