ILBOEXT

ILBOEXT is a COBOL library subroutine called by the Operating System when a QSAM file is opened. ILBOEXT is a DCB exit routine that adds the record format (RECFM) parameters (determined by the compiler) to the standard options specified in the DCB RECFM field of the DD card.

Reference Sources

IBM OS/VS COBOL Subroutine Library Program Logic, LY28-6425.