0                  Successful completion. The new inherited
                       default directory was established.
    -1                 Indicates failure. No new default directory
                       was established for child processes. The
                       function sets errno to one of the following
                       values:

                       o  ENOMEM - Insufficient memory

                       o  ENAMETOOLONG - default_dir is too long to
                          issue the required SET DEFAULT command.