IEAVMXIT and message processing

The message processing installation exit IEAVMXIT can gain control when any WTO or WTOR message is issued. In this exit, you can change routing codes, descriptor codes, and message texts and perform other message processing; you can also override the message processing facility (MPF).

If you do not specify your own message processing exit through MPFLSTxx, IEAVMXIT will get control if it is available and active when any WTO or WTOR message is issued. See Message processing exits other than IEAVMXIT.

To specify that you want to activate IEAVMXIT, use the following keyword on the INIT statement of CONSOLxx:

UEXIT: Defines whether you want the installation exit IEAVMXIT to process messages

UEXIT(Y) is the default; if you do not code this parameter, IEAVMXIT will be activated if it's installed. Operators can use the CONTROL M command to change the status of IEAVMXIT.

To have the user exit IEAVMXIT inactive at IPL, code the following parameter on the INIT statement:

UEXIT(N)

Reference

z/OS MVS Installation Exits describes IEAVMXIT in detail and provides a sample exit.