On Thursday, October 3, 2019, 12:50:34 PM PDT, Seymour J Metz wrote: >> these function are NOT 'exit' points in open/close processing
> OPEN and CLOSE call them through the SSI; how are they not exit points? The SSI is for subsystems and not for exit points. Subsystems can implement exits (e.g. MPFLST##). The SSI is for products that need subsystem capabilities. Part of the SSI functionality would be subsystem datasets. The SSI functions Open, close, restart, checkpoint and ???? allow products to implement their own I/O using the standard I/O macro's and allows your product to participate in device independence. The obvious example is JES where you specify SYSOUT= on the DD statement. Since someone mentioned these are not documented in the subsystem manual, the next most likely would be DFS because it contains most of the relevant information for I/O. In particular, it would describe how to modify the DCB or ACB for your subsystem requirements. The OP never described what functionality was needed. If he only needs open / close notification, then an SMF might solve his problem. Jon. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
