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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: Truncate a file
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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: 30 June 1994
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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 /* Emulator for ftruncate() call
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30 * Accepts: file descriptor
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31 * length
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32 * Returns: 0 if success, -1 if failure
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33 */
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34
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35 int ftruncate (int fd,off_t length)
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36 {
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37 struct flock fb;
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38 fb.l_whence = 0;
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39 fb.l_len = 0;
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40 fb.l_start = length;
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41 fb.l_type = F_WRLCK; /* write lock on file space */
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42 return fcntl (fd,F_FREESP,&fb);
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43 }
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