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