gtpi1m0bSystem Installation Support Reference

Installing Control Program User Exits

To install control program user exits, do the following:

  1. Update or replace copy member CUSR in CCUEXT. The IBM supplied copy of CUSR has user exit routine labels that are equated to a value of zero (EQU 0). When you install a user exit routine, remove the predefined entry point label and place it at the beginning of the user exit routine. Then add your code to the CUSR copy member.
  2. Assemble and link-edit the CCUEXT CSECT. The user exit routine is then incorporated in the control program. If the user exit routine is installed for a nondynamic exit point, no more action is required and the exit routine will be invoked by the control program whenever the exit point is met.

    However, if a dynamic exit routine was installed, you must also provide a program that will issue UXCMC macros to activate or deactivate the appropriate exit point in order for the exit routine to be useable.

    Note:
    To properly code a user exit routine, the programmer must be thoroughly familiar with the internals of the control program.