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1 /*
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2 * CDDL HEADER START
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3 *
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4 * The contents of this file are subject to the terms of the
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5 * Common Development and Distribution License, Version 1.0 only
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6 * (the "License"). You may not use this file except in compliance
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7 * with the License.
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8 *
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9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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10 * or http://www.opensolaris.org/os/licensing.
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11 * See the License for the specific language governing permissions
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12 * and limitations under the License.
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13 *
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14 * When distributing Covered Code, include this CDDL HEADER in each
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15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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16 * If applicable, add the following below this CDDL HEADER, with the
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17 * fields enclosed by brackets "[]" replaced with your own identifying
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18 * information: Portions Copyright [yyyy] [name of copyright owner]
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19 *
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20 * CDDL HEADER END
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21 */
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22 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
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23 /* All Rights Reserved */
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24
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25
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26 /*
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27 * University Copyright- Copyright (c) 1982, 1986, 1988
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28 * The Regents of the University of California
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29 * All Rights Reserved
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30 *
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31 * University Acknowledgment- Portions of this document are derived from
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32 * software developed by the University of California, Berkeley, and its
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33 * contributors.
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34 */
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35
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36 #pragma ident "@(#)lock.c 1.15 05/06/08 SMI"
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37
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38 /*
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39 * lock a file pointer
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40 */
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41
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42 #include <stdio.h>
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43 #include <string.h>
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44 #include <fcntl.h>
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45
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46 int
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47 lock(FILE *fp, char *mode, int blk)
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48 {
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49 struct flock l;
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50
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51 l.l_type = !strcmp(mode, "r") ? F_RDLCK : F_WRLCK;
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52 l.l_whence = 0;
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53 l.l_start = l.l_len = 0L;
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54 return fcntl(fileno(fp), blk ? F_SETLKW : F_SETLK, &l);
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55 }
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