Final register contents

The routine must leave the register status as follows:

Register 1:

Address of the parameter list described in Table 1 for begin, XID, and build vectors

0 for connection status, failure, and end vectors

Registers 2–14:

Restored to entry contents

Register 15:

Return code

X'00' (0): Processing successfully completed
X'01'–X'4F' (1–79): Definition selection failed; the XID exit remains active. VTAM® issues message IST1183I displaying the return code.
X'50'–X'7F' (80–127): Reserved
X'80'–X'EF' (128–239): Definition Selection failed; the XID exit is deactivated. VTAM issues message IST1183I displaying the return code.
X'F0'–X'FF' (240–255): Reserved

Note: If the exit returns a nonzero return code from an XID request, VTAM sends no more XIDs to the exit. If the exit returns a nonzero return code from a connection status request, VTAM sends no more connection status requests to the exit.