10Sstevel@tonic-gate /*
20Sstevel@tonic-gate * CDDL HEADER START
30Sstevel@tonic-gate *
40Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5*6812Sraf * Common Development and Distribution License (the "License").
6*6812Sraf * You may not use this file except in compliance with the License.
70Sstevel@tonic-gate *
80Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
90Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
100Sstevel@tonic-gate * See the License for the specific language governing permissions
110Sstevel@tonic-gate * and limitations under the License.
120Sstevel@tonic-gate *
130Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
140Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
150Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
160Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
170Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
180Sstevel@tonic-gate *
190Sstevel@tonic-gate * CDDL HEADER END
200Sstevel@tonic-gate */
21*6812Sraf
220Sstevel@tonic-gate /*
23*6812Sraf * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
240Sstevel@tonic-gate * Use is subject to license terms.
250Sstevel@tonic-gate */
260Sstevel@tonic-gate
270Sstevel@tonic-gate /* Copyright (c) 1988 AT&T */
280Sstevel@tonic-gate /* All Rights Reserved */
290Sstevel@tonic-gate
30*6812Sraf #pragma ident "%Z%%M% %I% %E% SMI"
310Sstevel@tonic-gate
32*6812Sraf #pragma weak _gethz = gethz
330Sstevel@tonic-gate
34*6812Sraf #include "lint.h"
350Sstevel@tonic-gate #include <stdio.h>
360Sstevel@tonic-gate #include <ctype.h>
370Sstevel@tonic-gate #include <stdlib.h>
380Sstevel@tonic-gate
390Sstevel@tonic-gate /*
400Sstevel@tonic-gate * gethz -- get the value of the clock hertz from the environment.
410Sstevel@tonic-gate *
420Sstevel@tonic-gate * return the clock hertz value if the string "HZ" in the environment is:
430Sstevel@tonic-gate * 1) Composed entirely of numbers.
440Sstevel@tonic-gate * 2) Not equal to zero.
450Sstevel@tonic-gate * Otherwise 0 is returned.
460Sstevel@tonic-gate */
470Sstevel@tonic-gate int
gethz(void)480Sstevel@tonic-gate gethz(void)
490Sstevel@tonic-gate {
500Sstevel@tonic-gate char *sptr, *cptr;
510Sstevel@tonic-gate
520Sstevel@tonic-gate if ((sptr = getenv("HZ")) == NULL) {
530Sstevel@tonic-gate return (0);
540Sstevel@tonic-gate } else {
550Sstevel@tonic-gate cptr = sptr;
560Sstevel@tonic-gate
570Sstevel@tonic-gate /* Check that all characters are numeric */
580Sstevel@tonic-gate while (*cptr) {
590Sstevel@tonic-gate if (!isdigit((unsigned char)*cptr))
600Sstevel@tonic-gate return (0);
610Sstevel@tonic-gate cptr++;
620Sstevel@tonic-gate }
630Sstevel@tonic-gate return (atoi(sptr));
640Sstevel@tonic-gate }
650Sstevel@tonic-gate }
66