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diff --git a/nuttx/lib/misc/lib_readdirr.c b/nuttx/lib/misc/lib_readdirr.c
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+/****************************************************************************
+ * lib/misc/lib_readdirr.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <string.h>
+#include <dirent.h>
+#include <errno.h>
+
+#include <nuttx/fs.h>
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: readdir_r
+ *
+ * Description:
+ *   The readdir() function returns a pointer to a dirent
+ *   structure representing the next directory entry in the
+ *   directory stream pointed to by dir.  It returns NULL on
+ *   reaching the end-of-file or if an error occurred.
+ *
+ * Inputs:
+ *   dirp -- An instance of type DIR created by a previous
+ *     call to opendir();
+ *   entry -- The  storage  pointed to by entry must be large
+ *     enough for a dirent with an array of char d_name
+ *     members containing at least {NAME_MAX}+1 elements.
+ *   result -- Upon successful return, the pointer returned
+ *     at *result shall have the  same  value  as  the 
+ *     argument entry. Upon reaching the end of the directory
+ *     stream, this pointer shall have the value NULL.
+ *
+ * Return:
+ *   If successful, the readdir_r() function return s zero;
+ *   otherwise, an error number is returned to indicate the
+ *   error.
+ *
+ *   EBADF   - Invalid directory stream descriptor dir
+ *
+ ****************************************************************************/
+
+int readdir_r(FAR DIR *dirp, FAR struct dirent *entry,
+              FAR struct dirent **result)
+{
+  struct dirent *tmp;
+
+  /* NOTE: The following use or errno is *not* thread-safe */
+
+  set_errno(0);
+  tmp = readdir(dirp);
+  if (!tmp)
+    {
+       int error = get_errno();
+       if (!error)
+          {
+            if (result)
+              {
+                *result = NULL;
+              }
+            return 0;
+          }
+       else
+          {
+            return error;
+          }
+    }
+
+  if (entry)
+    {
+      memcpy(entry, tmp, sizeof(struct dirent));
+    }
+
+  if (result)
+    {
+      *result = entry;
+    }
+  return 0;
+}
+