Return_Value

   0                  Successful completion.
   -1                 Indicates an error. errno is set to one of the
                      following:

                      o  EACCES - Search permission is denied for a
                         component of the path prefix.

                      o  EIO - An I/O error occurred while reading
                         the device.

                      o  EINTR - A signal was intercepted during
                         execution of the function.

                      o  EOVERFLOW - One of the values to be
                         returned cannot be represented correctly
                         in the structure pointed to by buffer.

                      o  ENAMETOOLONG - The length of a component
                         of the path parameter exceeds NAME_MAX, or
                         the length of the path parameter exceeds
                         PATH_MAX.

                      o  ENOENT - A component of path does not
                         name an existing file, or path is an empty
                         string.

                      o  ENOTDIR - A component of the path prefix of
                         the path parameter is not a directory.