Possible uses

Some possible uses of the TEST exits are described below:

Change the operands that the user specifies on the command
You can use the initialization exit to change the operands that users specify on the TEST command. The initialization exit receives the address of the command buffer. It can change the operands the user specifies on the TEST command by using a new command buffer. For example, the initialization exit can scan the command buffer and correct any errors on the command.

To check the command buffer and change its contents, the initialization exit can:

Scan the command buffer and decide, based on your own criteria, to change the command the user issued
Obtain storage for a new command buffer
Build the new command buffer
Update the key, length, and data fields for the new command buffer as follows:
Key

X'02'

Length

the length of the new command buffer

Data

the address of the new command buffer
Set a return code of 0 and return control to the TEST command processor

The exit must not change the command buffer it receives. It must create a new command buffer and return the address of the new command buffer to TEST.

For more information about the command buffer and the new command buffer, see TSO/E standard exit parameter list. For information about the format of the command buffer, see Command buffer.