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1 /* ========================================================================
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2 * Copyright 1988-2006 University of Washington
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3 *
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4 * Licensed under the Apache License, Version 2.0 (the "License");
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5 * you may not use this file except in compliance with the License.
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6 * You may obtain a copy of the License at
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7 *
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8 * http://www.apache.org/licenses/LICENSE-2.0
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9 *
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10 *
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11 * ========================================================================
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12 */
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13
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14 /*
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15 * Program: flock() emulation via fcntl() locking
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16 *
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17 * Author: Mark Crispin
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18 * Networks and Distributed Computing
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19 * Computing & Communications
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20 * University of Washington
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21 * Administration Building, AG-44
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22 * Seattle, WA 98195
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23 * Internet: MRC@CAC.Washington.EDU
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24 *
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25 * Date: 10 April 2001
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26 * Last Edited: 30 August 2006
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27 */
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28
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29 /* Cygwin does not seem to have the design flaw in fcntl() locking that
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30 * most other systems do (see flocksim.c for details). If some cretin
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31 * decides to implement that design flaw, then Cygwin will have to use
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32 * flocksim. Also, we don't test NFS either
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33 */
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34
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35
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36 #define flock flocksim /* use ours instead of theirs */
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37
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38 #undef LOCK_SH
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39 #define LOCK_SH 1 /* shared lock */
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40 #undef LOCK_EX
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41 #define LOCK_EX 2 /* exclusive lock */
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42 #undef LOCK_NB
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43 #define LOCK_NB 4 /* no blocking */
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44 #undef LOCK_UN
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45 #define LOCK_UN 8 /* unlock */
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46
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47
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48 /* Function prototypes */
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49
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50 int flocksim (int fd,int operation);
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