>Is there any discussion per function code No. 39 somewhere?
>From an old "orange book" titles "The Subsystem Interface in MVS/SP Version 3" >(GG66-3131-00): Function codes 7, 16, 17, 18, 19, 38, and 39 are the codes to build a subsystem that supports the SUBSYS= keyword in DD allocations. At conversion time, function 38 (Converter) is called once for each DD to verify the parameters on the SUBSYS= keyword. At step initiation, function 39 (Allocation Group) is called once for all DDs in the step specifying this subsystem on the SUBSYS= keyword. Functions 16 and 17 are the OPEN and CLOSE routines, resp. Function 7 (Unallocation) is called once for each DD statement at unallocation. Functions 18 and 19 support Checkpoint and Restart, resp. I don't know where writing your own subsystem to suppport SUBSYS= allocations is documented these days. It is not in the z/OS MVS Using the Subsystem Interface manual for whatever reason. -- Peter Hunkeler -- Peter Hunkeler ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
