Returns

   OpenVMS usage:cond_value
   type:         longword (unsigned)
   access:       write only
   mechanism:    by value

   A status code that your FILEIO routine returns to EDT$EDIT. The
   fileio argument is a longword containing the status code. The
   only failure code that is normally returned is RMS$_EOF from
   a GET call. All other OpenVMS RMS errors are signaled, not
   returned. The RMS signal should include the file name and both
   longwords of the RMS status. Any errors detected with the FILEIO
   routine can be indicated by setting status to an error code.
   That special error code will be returned to the program by the
   EDT$EDIT routine. There is a special status value EDT$_NONSTDFIL
   for nonstandard file opening.

   Condition values are returned in R0.