1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Create a new link |
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5 | * @ingroup libcsupport |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-1999. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.org/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <unistd.h> |
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22 | |
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23 | #include <rtems/libio_.h> |
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24 | |
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25 | /** |
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26 | * link() - POSIX 1003.1b - 5.3.4 - Create a new link |
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27 | */ |
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28 | int link( const char *path1, const char *path2 ) |
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29 | { |
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30 | int rv = 0; |
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31 | rtems_filesystem_eval_path_context_t ctx_1; |
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32 | rtems_filesystem_eval_path_context_t ctx_2; |
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33 | int eval_flags_1 = RTEMS_FS_FOLLOW_LINK; |
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34 | int eval_flags_2 = RTEMS_FS_FOLLOW_LINK |
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35 | | RTEMS_FS_MAKE |
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36 | | RTEMS_FS_EXCLUSIVE; |
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37 | const rtems_filesystem_location_info_t *currentloc_1 = |
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38 | rtems_filesystem_eval_path_start( &ctx_1, path1, eval_flags_1 ); |
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39 | const rtems_filesystem_location_info_t *currentloc_2 = |
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40 | rtems_filesystem_eval_path_start( &ctx_2, path2, eval_flags_2 ); |
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41 | |
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42 | rv = rtems_filesystem_location_exists_in_same_instance_as( |
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43 | currentloc_1, |
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44 | currentloc_2 |
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45 | ); |
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46 | if ( rv == 0 ) { |
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47 | rv = (*currentloc_2->mt_entry->ops->link_h)( |
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48 | currentloc_2, |
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49 | currentloc_1, |
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50 | rtems_filesystem_eval_path_get_token( &ctx_2 ), |
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51 | rtems_filesystem_eval_path_get_tokenlen( &ctx_2 ) |
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52 | ); |
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53 | } |
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54 | |
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55 | rtems_filesystem_eval_path_cleanup( &ctx_1 ); |
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56 | rtems_filesystem_eval_path_cleanup( &ctx_2 ); |
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57 | |
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58 | return rv; |
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59 | } |
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60 | |
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61 | #if defined(RTEMS_NEWLIB) |
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62 | |
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63 | #include <reent.h> |
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64 | |
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65 | /** |
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66 | * This is the Newlib dependent reentrant version of link(). |
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67 | */ |
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68 | int _link_r( |
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69 | struct _reent *ptr __attribute__((unused)), |
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70 | const char *path1, |
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71 | const char *path2 |
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72 | ) |
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73 | { |
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74 | return link( path1, path2 ); |
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75 | } |
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76 | #endif |
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