This chapter provides reference information necessary to code each
of the JES XCF exits:
- IXZXIT01 - Transport Exit
- IXZXIT02 - Receive Exit
- IXZXIT03 - Attach/Detach Exit.
Each exit description provides:
- The purpose of the exit and how your installation can use the
exit to modify processing of JES XCF.
- The parameter list that is passed to the exit and how to map the
parameter list.
- The environment that exists when the exit receives control:
- Address space in which the exit runs
- Addressing mode (AMODE)
- Address space control mode (ASC mode)
- Authorization
- Cross-memory mode
- Dispatchable unit mode
- Interrupt status
- JES environments
- Locks held at entry
- Residency mode (RMODE)
- Storage attributes (pageable and key)
- Register usage:
- Content when the exit receives control
- Content when the exit returns to its caller.
- How the exit communicates with its caller.
- Restrictions or requirements that affect the design of your exit
routine.
- JES or MVS services that the exit cannot use
- Subpool usage requirements and restrictions
- Maximum message lengths
- Recovery responsibilities.