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 #include "lint.h" 31 #include <sys/types.h> 32 #include <sys/times.h> 33 #include <time.h> 34 #include <sys/param.h> /* for HZ (clock frequency in Hz) */ 35 36 #define TIMES(B) (B.tms_utime+B.tms_stime+B.tms_cutime+B.tms_cstime) 37 38 39 clock_t clock(void)40clock(void) 41 { 42 struct tms buffer; 43 static int Hz = 0; 44 static clock_t first; 45 extern int gethz(void); /* XXX should be in a header file! */ 46 47 if (times(&buffer) == (clock_t)-1) 48 return ((clock_t)-1); 49 if (Hz == 0) { 50 if ((Hz = gethz()) == 0) 51 Hz = HZ; 52 first = TIMES(buffer); 53 } 54 55 return ((TIMES(buffer) - first) * (CLOCKS_PER_SEC/Hz)); 56 } 57