A special call is available for BFSs to return a count of the records in a file. This call was designed for filing systems such as Linear Hash (RTP57) that maintain a record count directly in the file. This call is available only through the system subroutine GET.RECCOUNT (or directly).
If the filing system is not able to fulfill the request for a record count, it will return a status value of zero. This value is in turn passed back via the second argument of GET.RECCOUNT as a "valid" flag.
