SNA LU management program exit (XZCATT)

This exit is invoked before a task attach for a LU terminal task.

When invoked

Before task attach for terminal tasks.

Exit-specific parameters

UEPTCTTE

Address of the terminal control table terminal entry (TCTTE). The TCTTE can be mapped using the DSECT DFHTCTTE.

UEPTIOA

Address of the terminal input/output area (TIOA). The TIOA can be mapped using the DSECT DFHTIOA. However, fields TIOASAL and TIOASCA are not programming interfaces.

UEPTPN

Address of the APPC transaction process name (TPN), or the LU6.1 process name (DPN), whose length is addressed by the parameter UEPTPNL.

UEPTPNL

Address of a 1-byte field containing the length of the TPN or DPN.

UEPTRAN

Address of the 4-byte transaction ID.

Note: The exit program must not change the TRANSID of tasks started by automatic transaction initiation (ATI). (This is because CICS® needs to match the TRANSID in its program control table with the TRANSID in the automatic initiate descriptor (AID) that was created in the AOR.)

Return codes

UERCNORM

Continue processing.

XPI calls

All can be used.