4.104.114.84.95
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1 | /* |
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2 | * readlink() - POSIX 1003.1b - X.X.X - XXX |
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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 "libio_.h" |
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15 | |
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16 | int readlink( |
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17 | const char *pathname, |
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18 | char *buf, |
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19 | int bufsize |
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20 | ) |
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21 | { |
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22 | rtems_filesystem_location_info_t loc; |
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23 | int result; |
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24 | |
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25 | if (!buf) |
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26 | set_errno_and_return_minus_one( EFAULT ); |
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27 | |
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28 | result = rtems_filesystem_evaluate_path( pathname, 0, &loc, FALSE ); |
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29 | if ( result != 0 ) |
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30 | return -1; |
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31 | |
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32 | if ( !loc.ops->node_type ){ |
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33 | rtems_filesystem_freenode( &loc ); |
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34 | set_errno_and_return_minus_one( ENOTSUP ); |
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35 | } |
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36 | |
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37 | if ( (*loc.ops->node_type)( &loc ) != RTEMS_FILESYSTEM_SYM_LINK ){ |
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38 | rtems_filesystem_freenode( &loc ); |
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39 | set_errno_and_return_minus_one( EINVAL ); |
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40 | } |
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41 | |
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42 | if ( !loc.ops->readlink ){ |
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43 | rtems_filesystem_freenode( &loc ); |
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44 | set_errno_and_return_minus_one( ENOTSUP ); |
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45 | } |
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46 | |
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47 | result = (*loc.ops->readlink)( &loc, buf, bufsize ); |
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48 | |
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49 | rtems_filesystem_freenode( &loc ); |
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50 | |
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51 | return result; |
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52 | } |
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