source: rtems/c/src/lib/libc/link.c @ 7068e246

4.104.114.84.95
Last change on this file since 7068e246 was 08311cc3, checked in by Joel Sherrill <joel.sherrill@…>, on 11/17/99 at 17:51:34

Updated copyright notice.

  • Property mode set to 100644
File size: 2.1 KB
Line 
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
20int 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
85int _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
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