/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2008 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* Copyright (c) 1988 AT&T */ /* All Rights Reserved */ #pragma ident "%Z%%M% %I% %E% SMI" #pragma weak _gethz = gethz #include "lint.h" #include <stdio.h> #include <ctype.h> #include <stdlib.h> /* * gethz -- get the value of the clock hertz from the environment. * * return the clock hertz value if the string "HZ" in the environment is: * 1) Composed entirely of numbers. * 2) Not equal to zero. * Otherwise 0 is returned. */ int gethz(void) { char *sptr, *cptr; if ((sptr = getenv("HZ")) == NULL) { return (0); } else { cptr = sptr; /* Check that all characters are numeric */ while (*cptr) { if (!isdigit((unsigned char)*cptr)) return (0); cptr++; } return (atoi(sptr)); } }