Librarian does support user exits under its Batch Update facility. The user exit may be common, or may be assigned to a specific master file. In order to configure this option, MFA references a reserved DD named LIBXIT$. If specified in the JCL, MFA builds a memory table to specify the Output Exit to be used for the given master file.
* Librarian Exit Table (fixed format) * * EXIT columns 1-8 is an exit module name * found in the STEPLIB, JOBLIB, LINKLIB concatenation * LIBRARIAN MASTER name resides in columns 11-54 * any master file with this prefix will invoke the exit * * EXIT Librarian Master file prefix or full name ******** ******************************************** LIBREXIT PROD.LIB LBXIT02 MY.LIBRARIAN.MASTER