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 #pragma weak _gethz = gethz 33 34 #include "lint.h" 35 #include <stdio.h> 36 #include <ctype.h> 37 #include <stdlib.h> 38 39 /* 40 * gethz -- get the value of the clock hertz from the environment. 41 * 42 * return the clock hertz value if the string "HZ" in the environment is: 43 * 1) Composed entirely of numbers. 44 * 2) Not equal to zero. 45 * Otherwise 0 is returned. 46 */ 47 int 48 gethz(void) 49 { 50 char *sptr, *cptr; 51 52 if ((sptr = getenv("HZ")) == NULL) { 53 return (0); 54 } else { 55 cptr = sptr; 56 57 /* Check that all characters are numeric */ 58 while (*cptr) { 59 if (!isdigit((unsigned char)*cptr)) 60 return (0); 61 cptr++; 62 } 63 return (atoi(sptr)); 64 } 65 } 66