source:
rtems/cpukit/libcsupport/src/readlink.c
@
9c3fa30
Last change on this file since 9c3fa30 was 9c3fa30, checked in by Joel Sherrill <joel.sherrill@…>, on 09/28/00 at 20:19:23 | |
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File size: 1.2 KB |
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1 | /* |
2 | * readlink() - POSIX 1003.1b - X.X.X - XXX |
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 "libio_.h" |
15 | |
16 | int readlink( |
17 | const char *pathname, |
18 | char *buf, |
19 | int bufsize |
20 | ) |
21 | { |
22 | rtems_filesystem_location_info_t loc; |
23 | int result; |
24 | |
25 | if (!buf) |
26 | set_errno_and_return_minus_one( EFAULT ); |
27 | |
28 | result = rtems_filesystem_evaluate_path( pathname, 0, &loc, FALSE ); |
29 | if ( result != 0 ) |
30 | return -1; |
31 | |
32 | if ( !loc.ops->node_type_h ){ |
33 | rtems_filesystem_freenode( &loc ); |
34 | set_errno_and_return_minus_one( ENOTSUP ); |
35 | } |
36 | |
37 | if ( (*loc.ops->node_type_h)( &loc ) != RTEMS_FILESYSTEM_SYM_LINK ){ |
38 | rtems_filesystem_freenode( &loc ); |
39 | set_errno_and_return_minus_one( EINVAL ); |
40 | } |
41 | |
42 | if ( !loc.ops->readlink_h ){ |
43 | rtems_filesystem_freenode( &loc ); |
44 | set_errno_and_return_minus_one( ENOTSUP ); |
45 | } |
46 | |
47 | result = (*loc.ops->readlink_h)( &loc, buf, bufsize ); |
48 | |
49 | rtems_filesystem_freenode( &loc ); |
50 | |
51 | return result; |
52 | } |
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