IBM SC34-6814-04 - Manual (Page 252)

run. It is important that your exit program supply a terminal
netname if the TOR to which it directs the ATI request is a member
of a VTAM generic resource.
Return codes
UERCTEUN
Terminal unknown, reject request.
UERCNETN
Terminal known, netname returned in UEPICNTO.
UERCSYSI
Terminal known, sysid returned in UEPICSYO.
UERCPURG
Task purged during XPI call.
XPI calls
The following must not be used:
v ADD_SUSPEND
v DELETE_SUSPEND
v DEQUEUE
v ENQUEUE
v RESUME
v SUSPEND
v WAIT_MVS.
The sample program for the XALTENF and XICTENF exits,
DFHXTENF
One program can be used for both exits, or a separate program can be written for
each. Figure 2 on page 231 shows the executable code from the supplied sample
program DFHXTENF, which can be used for both exits. DFHXTENF rejects
transient data requests, because the action in this case is very much
installation-dependent.
230 Customization Guide