source:
rtems/c/src/exec/libfs/src/imfs/imfs_link.c
@
c058578
Last change on this file since c058578 was c058578, checked in by Joel Sherrill <joel.sherrill@…>, on 11/01/00 at 21:02:46 | |
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1 | /* |
2 | * IMFS_link |
3 | * |
4 | * The following rouine creates a new link node under parent with the |
5 | * name given in name. The link node is set to point to the node at |
6 | * to_loc. |
7 | * |
8 | * COPYRIGHT (c) 1989-1999. |
9 | * On-Line Applications Research Corporation (OAR). |
10 | * |
11 | * The license and distribution terms for this file may be |
12 | * found in the file LICENSE in this distribution or at |
13 | * http://www.OARcorp.com/rtems/license.html. |
14 | * |
15 | * $Id$ |
16 | */ |
17 | |
18 | #include <errno.h> |
19 | #include "imfs.h" |
20 | #include <rtems/libio_.h> |
21 | |
22 | int IMFS_link( |
23 | rtems_filesystem_location_info_t *to_loc, /* IN */ |
24 | rtems_filesystem_location_info_t *parent_loc, /* IN */ |
25 | const char *token /* IN */ |
26 | ) |
27 | { |
28 | IMFS_types_union info; |
29 | IMFS_jnode_t *new_node; |
30 | char new_name[ IMFS_NAME_MAX + 1 ]; |
31 | int i; |
32 | |
33 | /* |
34 | * Verify this node can be linked to. |
35 | */ |
36 | |
37 | info.hard_link.link_node = to_loc->node_access; |
38 | if ( info.hard_link.link_node->st_nlink >= LINK_MAX ) |
39 | set_errno_and_return_minus_one( EMLINK ); |
40 | |
41 | /* |
42 | * Remove any separators at the end of the string. |
43 | */ |
44 | |
45 | IMFS_get_token( token, new_name, &i ); |
46 | |
47 | /* |
48 | * Create a new link node. |
49 | */ |
50 | |
51 | new_node = IMFS_create_node( |
52 | parent_loc, |
53 | IMFS_HARD_LINK, |
54 | new_name, |
55 | ( S_IFLNK | ( S_IRWXU | S_IRWXG | S_IRWXO )), |
56 | &info |
57 | ); |
58 | |
59 | if ( !new_node ) |
60 | set_errno_and_return_minus_one( ENOMEM ); |
61 | |
62 | /* |
63 | * Increment the link count of the node being pointed to. |
64 | */ |
65 | |
66 | info.hard_link.link_node->st_nlink++; |
67 | IMFS_update_ctime( info.hard_link.link_node ); |
68 | |
69 | return 0; |
70 | } |
71 |
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