TPU$_SUCCESS       Normal successful completion.
    TPU$_COMPILEFAIL   The compilation of the initialization file was
                       unsuccessful.
    TPU$_EXECUTEFAIL   The execution of the statements in the
                       initialization file was unsuccessful.
    TPU$_EXITING       A result of EXIT. If the default condition
                       handler is being used, the session is
                       terminated.
    TPU$_FAILURE       General code for all other errors.
    TPU$_QUITTING      A result of QUIT. If the default condition
                       handler is being used, the session is
                       terminated.