1 | /* |
---|
2 | * link() - POSIX 1003.1b - 5.3.4 - Create a new link |
---|
3 | * |
---|
4 | * COPYRIGHT (c) 1989-1999. |
---|
5 | * On-Line Applications Research Corporation (OAR). |
---|
6 | * |
---|
7 | * The license and distribution terms for this file may be |
---|
8 | * found in the file LICENSE in this distribution or at |
---|
9 | * http://www.OARcorp.com/rtems/license.html. |
---|
10 | * |
---|
11 | * $Id$ |
---|
12 | */ |
---|
13 | |
---|
14 | #include <rtems.h> |
---|
15 | #include <rtems/libio.h> |
---|
16 | #include <errno.h> |
---|
17 | |
---|
18 | #include "libio_.h" |
---|
19 | |
---|
20 | int link( |
---|
21 | const char *existing, |
---|
22 | const char *new |
---|
23 | ) |
---|
24 | { |
---|
25 | rtems_filesystem_location_info_t existing_loc; |
---|
26 | rtems_filesystem_location_info_t parent_loc; |
---|
27 | int i; |
---|
28 | int result; |
---|
29 | const char *name_start; |
---|
30 | |
---|
31 | /* |
---|
32 | * Get the node we are linking to. |
---|
33 | */ |
---|
34 | |
---|
35 | result = rtems_filesystem_evaluate_path( existing, 0, &existing_loc, TRUE ); |
---|
36 | if ( result != 0 ) |
---|
37 | return -1; |
---|
38 | |
---|
39 | /* |
---|
40 | * Get the parent of the node we are creating. |
---|
41 | */ |
---|
42 | |
---|
43 | rtems_filesystem_get_start_loc( new, &i, &parent_loc ); |
---|
44 | result = (*parent_loc.ops->evalformake)( &new[i], &parent_loc, &name_start ); |
---|
45 | if ( result != 0 ) { |
---|
46 | rtems_filesystem_freenode( &parent_loc ); |
---|
47 | set_errno_and_return_minus_one( result ); |
---|
48 | } |
---|
49 | |
---|
50 | /* |
---|
51 | * Check to see if the caller is trying to link across file system |
---|
52 | * boundaries. |
---|
53 | */ |
---|
54 | |
---|
55 | if ( parent_loc.mt_entry != existing_loc.mt_entry ) { |
---|
56 | rtems_filesystem_freenode( &existing_loc ); |
---|
57 | rtems_filesystem_freenode( &parent_loc ); |
---|
58 | set_errno_and_return_minus_one( EXDEV ); |
---|
59 | } |
---|
60 | |
---|
61 | if ( !parent_loc.ops->link ) { |
---|
62 | rtems_filesystem_freenode( &existing_loc ); |
---|
63 | rtems_filesystem_freenode( &parent_loc ); |
---|
64 | set_errno_and_return_minus_one( ENOTSUP ); |
---|
65 | } |
---|
66 | |
---|
67 | result = (*parent_loc.ops->link)( &existing_loc, &parent_loc, name_start ); |
---|
68 | |
---|
69 | rtems_filesystem_freenode( &existing_loc ); |
---|
70 | rtems_filesystem_freenode( &parent_loc ); |
---|
71 | |
---|
72 | return result; |
---|
73 | } |
---|
74 | |
---|
75 | /* |
---|
76 | * _link_r |
---|
77 | * |
---|
78 | * This is the Newlib dependent reentrant version of link(). |
---|
79 | */ |
---|
80 | |
---|
81 | #if defined(RTEMS_NEWLIB) |
---|
82 | |
---|
83 | #include <reent.h> |
---|
84 | |
---|
85 | int _link_r( |
---|
86 | struct _reent *ptr, |
---|
87 | const char *existing, |
---|
88 | const char *new |
---|
89 | ) |
---|
90 | { |
---|
91 | return link( existing, new ); |
---|
92 | } |
---|
93 | #endif |
---|
94 | |
---|