Writing exits for the ALLOCATE command

TSO/E users issue the ALLOCATE command to create new data sets, allocate existing data sets for a job, and create system output (SYSOUT) data sets.

TSO/E provides initialization and termination exits that you can use to customize the ALLOCATE command. These exits receive control during ALLOCATE command processing, as follows:

The initialization exit receives control before the ALLOCATE command processor invokes the parse service routine to syntax check the input parameters.
The termination exit receives control just before the ALLOCATE command terminates processing.

The following highlights some ways you can use the initialization and termination exits. For more information about how you can use the exits, see Possible uses.

Some ways you can use the initialization exit are:

Providing a command buffer address to replace the command syntax specified by the user
Changing the default values for operands of the ALLOCATE command
Specifying an alternative return code

Some ways you can use the termination exit are:

Performing clean-up processing
Specifying an alternative return code