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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, Version 1.0 only
      6  * (the "License").  You may not use this file except in compliance
      7  * with the License.
      8  *
      9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
     10  * or http://www.opensolaris.org/os/licensing.
     11  * See the License for the specific language governing permissions
     12  * and limitations under the License.
     13  *
     14  * When distributing Covered Code, include this CDDL HEADER in each
     15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     16  * If applicable, add the following below this CDDL HEADER, with the
     17  * fields enclosed by brackets "[]" replaced with your own identifying
     18  * information: Portions Copyright [yyyy] [name of copyright owner]
     19  *
     20  * CDDL HEADER END
     21  */
     22 /*
     23  * Copyright 1987 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 /*      Copyright (c) 1984 AT&T */
     28 /*        All Rights Reserved   */
     29 
     30 #pragma ident	"%Z%%M%	%I%	%E% SMI"  /* from S5R2 1.1 */
     31 
     32 /*LINTLIBRARY*/
     33 
     34 #include <sys/types.h>
     35 #include <sys/times.h>
     36 #include <sys/param.h>	/* for HZ (clock frequency in Hz) */
     37 #define TIMES(B)	(B.tms_utime+B.tms_stime+B.tms_cutime+B.tms_cstime)
     38 
     39 extern long times();
     40 static long first;
     41 
     42 long
     43 clock()
     44 {
     45 	struct tms buffer;
     46 
     47 	if (times(&buffer) == -1L)
     48 		return (0L);
     49 	if (first == 0L)
     50 		first = TIMES(buffer);
     51 	return ((TIMES(buffer) - first) * (1000000L/HZ));
     52 }
     53