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      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 
     41 clock_t
     42 clock(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