1 | /* |
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2 | * link() - POSIX 1003.1b - 5.3.4 - Create a new link |
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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 | #if HAVE_CONFIG_H |
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15 | #include "config.h" |
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16 | #endif |
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17 | |
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18 | #include <rtems.h> |
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19 | #include <rtems/libio.h> |
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20 | #include <errno.h> |
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21 | |
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22 | #include <rtems/libio_.h> |
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23 | |
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24 | int link( |
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25 | const char *existing, |
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26 | const char *new |
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27 | ) |
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28 | { |
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29 | rtems_filesystem_location_info_t existing_loc; |
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30 | rtems_filesystem_location_info_t parent_loc; |
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31 | int i; |
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32 | int result; |
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33 | const char *name_start; |
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34 | |
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35 | /* |
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36 | * Get the node we are linking to. |
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37 | */ |
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38 | |
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39 | result = rtems_filesystem_evaluate_path( existing, 0, &existing_loc, TRUE ); |
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40 | if ( result != 0 ) |
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41 | return -1; |
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42 | |
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43 | /* |
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44 | * Get the parent of the node we are creating. |
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45 | */ |
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46 | |
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47 | rtems_filesystem_get_start_loc( new, &i, &parent_loc ); |
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48 | |
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49 | if ( !parent_loc.ops->evalformake_h ) { |
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50 | rtems_filesystem_freenode( &existing_loc ); |
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51 | rtems_filesystem_freenode( &parent_loc ); |
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52 | set_errno_and_return_minus_one( ENOTSUP ); |
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53 | } |
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54 | |
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55 | result = (*parent_loc.ops->evalformake_h)( &new[i], &parent_loc, &name_start ); |
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56 | if ( result != 0 ) { |
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57 | rtems_filesystem_freenode( &existing_loc ); |
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58 | rtems_filesystem_freenode( &parent_loc ); |
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59 | set_errno_and_return_minus_one( result ); |
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60 | } |
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61 | |
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62 | /* |
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63 | * Check to see if the caller is trying to link across file system |
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64 | * boundaries. |
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65 | */ |
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66 | |
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67 | if ( parent_loc.mt_entry != existing_loc.mt_entry ) { |
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68 | rtems_filesystem_freenode( &existing_loc ); |
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69 | rtems_filesystem_freenode( &parent_loc ); |
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70 | set_errno_and_return_minus_one( EXDEV ); |
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71 | } |
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72 | |
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73 | if ( !parent_loc.ops->link_h ) { |
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74 | rtems_filesystem_freenode( &existing_loc ); |
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75 | rtems_filesystem_freenode( &parent_loc ); |
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76 | set_errno_and_return_minus_one( ENOTSUP ); |
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77 | } |
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78 | |
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79 | result = (*parent_loc.ops->link_h)( &existing_loc, &parent_loc, name_start ); |
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80 | |
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81 | rtems_filesystem_freenode( &existing_loc ); |
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82 | rtems_filesystem_freenode( &parent_loc ); |
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83 | |
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84 | return result; |
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85 | } |
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86 | |
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87 | /* |
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88 | * _link_r |
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89 | * |
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90 | * This is the Newlib dependent reentrant version of link(). |
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91 | */ |
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92 | |
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93 | #if defined(RTEMS_NEWLIB) |
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94 | |
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95 | #include <reent.h> |
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96 | |
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97 | int _link_r( |
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98 | struct _reent *ptr, |
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99 | const char *existing, |
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100 | const char *new |
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101 | ) |
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102 | { |
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103 | return link( existing, new ); |
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104 | } |
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105 | #endif |
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106 | |
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