1 files changed, 103 insertions, 0 deletions
diff --git a/cpukit/libcsupport/src/unlink.c b/cpukit/libcsupport/src/unlink.c
new file mode 100644
index 0000000000..bb28959b6d
--- /dev/null
+++ b/cpukit/libcsupport/src/unlink.c
@@ -0,0 +1,103 @@
+/*
+ *  unlink() - POSIX 1003.1b - 5.5.1 - Remove an existing link
+ *
+ *  COPYRIGHT (c) 1989-1999.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ *
+ *  $Id$
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <errno.h>
+
+#include <rtems/libio_.h>
+#include <rtems/seterr.h>
+
+int unlink(
+  const char *path
+)
+{
+  int                               parentpathlen;
+  const char                       *name;
+  rtems_filesystem_location_info_t  parentloc;
+  rtems_filesystem_location_info_t  loc;
+  int                               i;
+  int                               result;
+  bool                              free_parentloc = false;
+
+  /*
+   * Get the node to be unlinked. Find the parent path first.
+   */
+
+  parentpathlen = rtems_filesystem_dirname ( path );
+
+  if ( parentpathlen == 0 )
+    rtems_filesystem_get_start_loc( path, &i, &parentloc );
+  else {
+    result = rtems_filesystem_evaluate_path( path, parentpathlen,
+                                             RTEMS_LIBIO_PERMS_WRITE,
+                                             &parentloc,
+                                             false );
+    if ( result != 0 )
+      return -1;
+
+    free_parentloc = true;
+  }
+
+  /*
+   * Start from the parent to find the node that should be under it.
+   */
+
+  loc = parentloc;
+  name = path + parentpathlen;
+  name += rtems_filesystem_prefix_separators( name, strlen( name ) );
+
+  result = rtems_filesystem_evaluate_relative_path( name , strlen( name ),
+                                                    0, &loc, false );
+  if ( result != 0 ) {
+    if ( free_parentloc )
+      rtems_filesystem_freenode( &parentloc );
+    return -1;
+  }
+
+  if (  (*loc.ops->node_type_h)( &loc ) == RTEMS_FILESYSTEM_DIRECTORY ) {
+    rtems_filesystem_freenode( &loc );
+    if ( free_parentloc )
+      rtems_filesystem_freenode( &parentloc );
+    rtems_set_errno_and_return_minus_one( EISDIR );
+  }
+
+  result = (*loc.ops->unlink_h)( &parentloc, &loc );
+
+  rtems_filesystem_freenode( &loc );
+  if ( free_parentloc )
+    rtems_filesystem_freenode( &parentloc );
+
+  return result;
+}
+
+/*
+ *  _unlink_r
+ *
+ *  This is the Newlib dependent reentrant version of unlink().
+ */
+
+#if defined(RTEMS_NEWLIB)
+
+#include <reent.h>
+
+int _unlink_r(
+  struct _reent *ptr __attribute__((unused)),
+  const char    *path
+)
+{
+  return unlink( path );
+}
+#endif