gtpi1m32 | System Installation Support Reference |
The CP-CP session activation user exit, UACP, determines if a TPF processor
is allowed to start CP-CP sessions. When no TPF processor in the
loosely coupled complex has CP-CP sessions, UACP is called during cycle-up and
when an APPN-capable link is activated while the TPF system is in NORM
state.
- Note:
- If this user exit is coded to not allow CP-CP sessions on a processor, you
can still start CP-CP sessions on that processor by issuing the ZNETW ACT
command.
Input
- CE1CPD
- CPU ID of this processor (the processor that wants to start CP-CP
sessions)
Programming Considerations
- IBM provides sample code for UACP, which sets the return code to 0
indicating that this processor is allowed to start CP-CP sessions.
- In a uniprocessor TPF environment, you do not need to modify this user
exit because the default logic shipped by IBM allows CP-CP sessions on the TPF
processor that invokes this user exit.
- If you want to limit the processors that are allowed to start the CP-CP
sessions in a TPF loosely coupled complex, code UACP to check the CPU ID to
determine if this TPF processor is allowed to start CP-CP sessions.
- Data level D2 must not be modified. All other data levels are
available for use by this user exit.
- EBW000-EBW103 and CE1UR1-CE1UR7 must not be modified.
EBX000-EBX103 is available for use by this user exit.
Return Values
R0 contains the return code:
- 0
- This TPF processor is allowed to start CP-CP sessions.
- 1
- This TPF processor is not allowed to start CP-CP sessions.