Condition_Values_Returned

   SS$_NORMAL         Successful completion. The user input routine
                      has completed the function that the symbiont
                      requested.
   PSM$_FLUSH         Flush output stream. The user input routine
                      can return this status only when called with
                      the PSM$K_READ function code. When this status
                      is returned to the symbiont, the symbiont
                      stops calling the input routine with the
                      PSM$K_READ function code until all outstanding
                      format and output operations have completed.
   PSM$_FUNNOTSUP     Function not supported. The user input routine
                      does not support or does not recognize the
                      function code supplied by the symbiont.
                      To ensure future compatibility, your input
                      routine should return this status for any
                      unrecognized status codes.
   PSM$_PENDING       Requested function accepted but not completed.
                      Your input routine can return this status only
                      with the PSM$K_READ function call. Further,
                      if your routine returns PSM$_PENDING, your
                      routine must eventually signal completion
                      via the PSM$REPORT routine. Refer to the
                      description of the PSM$REPORT routine for
                      more information about asynchronous operations
                      and the PSM$_PENDING condition value.

   This routine also returns any error condition values that you
   have coded your format routine to return.