User Exit Reference › ALLOCATE User Exit

ALLOCATE User Exit

Use the ALLOCATE user exit, a REXX-only user exit, to manipulate the drives in the EDL, and to modify drive usage information. The ALLOCATE user exit is called after CA VM:Tape constructs the EDL. If you have defined the LMS interface, the ALLOCATE user exit is called after the EDL reduction step.

The default environment for user exits defined by the USEREXIT record is CA VM:Tape. Any command that is not a REXX command is considered a CA VM:Tape primitive, a CP command, or a CMS command.

The ALLOCATE user exit does not pass any parameters; it works through two CA VM:Tape primitives, EXTRACT and SET. These primitives are modeled after the XEDIT subcommands by the same name. For more information about the EXTRACT and SET primitives, see Macro Primitive Reference.

Note: For more information about how tape drives are ordered in the EDL, see Drive Allocation.