Final register contents

The routine must leave the register status as follows:

Registers 1–14:

Restored to entry contents

Register 15:

Return Code:

X'0': Processing successfully completed. VTAM® attempts to establish the session with the modified VR/TP list.
X'4': VTAM attempts to establish the session with the original VR/TP list defined in the CoS table. No modifications from the exit are used.
X'01'–X'7F': For other return code values, exit processing did not work. The session management exit remains active.

In addition to these specific return codes, there are other codes that control the exit's disablement. See Final register contents for more information about those codes.

Note: A return code that is not valid (that is, a return code not defined here) means that session establishment will be attempted with the original VR/TP list defined in the CoS table. VTAM issues message IST793E.