Passing parameters to a listener user exit routine

The listener user exit routine receives parameters in a six-word data structure that is pointed to by register 1 on entry to the listener user exit routine.

The six-word data structure contains parameters from one or both of the following sources:
  • The system. The first fullword of the data structure contains the address of the parameter list associated with the ENF event code's mapping macro. See ENF event codes and meanings for a list of the mapping macros.
  • The ENF listener. The listening program can send parameters to the listener user exit routine by using the PARM keyword on the ENFREQ macro. PARM can be either a fullword of data or the address of a parameter list. PARM is passed to the listener user exit routine in the third word of the data structure.
Parent topic: Listening for system events