Format of the exit descriptions

This section describes each of the individual exits using the same format. The format of the description is shown below.

Functional Description

provides an overview of the function or command that the exit is for. It describes at what point in the function's or command's processing the exit receives control. It also highlights how you can use the exit.

TSO/E-Supplied Exit

describes the processing of the default TSO/E exit routine if TSO/E provides one.

Entry Specifications

describes the contents of the registers on entry.

Parameter Descriptions

describes the contents of the parameter list that the exit receives from the invoking program.

Return Specifications

describes what the registers must contain when the exit returns control to the invoking program. It also describes the possible return codes from the exit.

Programming Considerations

describes various considerations for writing the exit. It contains information, such as whether the exit must be reentrant, refreshable, and reusable, APF-authorization, and the TSO/E service routines the exit can use. It also includes information about:

Installing the exit, including:
- Naming conventions, if any
- Where the exit can reside (for example, STEPLIB, LPALIB)
- Linkage considerations.
Environment
Includes the state and key that the exit executes in, AMODE and RMODE requirements, and other operational considerations.
Restrictions and Limitations
Lists any restrictions or limitations for the exit itself or any effect on other system processing because of exit processing.

Possible Uses

describes different tasks you can perform using the exit.