4.104.114.84.95
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1 | /* |
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2 | * dup2() - POSIX 1003.1b 6.2.1 Duplicate an Open File Descriptor |
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3 | * |
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4 | * COPYRIGHT (c) 1989-1999. |
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5 | * On-Line Applications Research Corporation (OAR). |
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6 | * |
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7 | * The license and distribution terms for this file may be |
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8 | * found in the file LICENSE in this distribution or at |
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9 | * http://www.OARcorp.com/rtems/license.html. |
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10 | * |
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11 | * $Id$ |
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12 | */ |
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13 | |
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14 | #include <unistd.h> |
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15 | #include <fcntl.h> |
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16 | |
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17 | #include "libio_.h" |
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18 | |
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19 | int dup2( |
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20 | int fildes, |
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21 | int fildes2 |
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22 | ) |
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23 | { |
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24 | int status; |
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25 | struct stat buf; |
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26 | |
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27 | /* |
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28 | * If fildes is not valid, then fildes2 should not be closed. |
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29 | */ |
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30 | |
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31 | status = fstat( fildes, &buf ); |
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32 | if ( status == -1 ) |
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33 | return -1; |
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34 | |
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35 | /* |
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36 | * If fildes2 is not valid, then we should not do anything either. |
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37 | */ |
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38 | |
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39 | status = fstat( fildes2, &buf ); |
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40 | if ( status == -1 ) |
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41 | return -1; |
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42 | |
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43 | /* |
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44 | * This fcntl handles everything else. |
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45 | */ |
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46 | |
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47 | return fcntl( fildes, F_DUPFD, fildes2 ); |
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48 | } |
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