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 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* Copyright (c) 1988 AT&T */ 30 /* All Rights Reserved */ 31 32 33 #pragma weak gethz = _gethz 34 35 #include "synonyms.h" 36 #include <stdio.h> 37 #include <ctype.h> 38 #include <stdlib.h> 39 40 /* 41 * gethz -- get the value of the clock hertz from the environment. 42 * 43 * return the clock hertz value if the string "HZ" in the environment is: 44 * 1) Composed entirely of numbers. 45 * 2) Not equal to zero. 46 * Otherwise 0 is returned. 47 */ 48 int 49 gethz(void) 50 { 51 char *sptr, *cptr; 52 53 if ((sptr = getenv("HZ")) == NULL) { 54 return (0); 55 } else { 56 cptr = sptr; 57 58 /* Check that all characters are numeric */ 59 while (*cptr) { 60 if (!isdigit((unsigned char)*cptr)) 61 return (0); 62 cptr++; 63 } 64 return (atoi(sptr)); 65 } 66 } 67