Specifying installation exits

With the PROGxx and EXITxx parmlib members, you can specify installation exits. You can use either of these members, but IBM® suggests using PROGxx. With PROGxx, you can take the following steps, at IPL or while the system is running:

Add exit routines to an exit
Change the state of an exit routine
Delete exit routines from an exit
Change the attributes of an exit
Undefine implicitly defined exits
Specify multiple PROGxx parmlib members using the PROG=xx system parameter.

You can use the PROG=xx system parameter at IPL to specify the particular PROGxx parmlib member the system is to use; or the operator can enter a SET PROG=xx command to set a current PROGxx parmlib member during normal processing. When the operator enters a SET PROG=xx command, the change remains in effect only for the duration of the current IPL. For information about how to use the SET PROG=xx command, see z/OS MVS System Commands.

If you currently use the EXITxx parmlib member to specify installation exits, you can convert the format of EXITxx to the PROGxx format by using the IEFEXPR REXX exec provided by IBM.

The system also allows you to specify SMF exits through the SMFPRMxx parmlib member. You can associate exit routines with these SMF exits by adding EXIT statements to PROGxx that are equivalent to those in SMFPRMxx. The EXIT statements in SMFPRMxx list the exits; the EXIT statements in PROGxx list the associated exit routines. The EXIT statements in SMFPRMxx must remain. See Specifying SMF Exits to the Dynamic Exits Facility for an example of how to add EXIT statements to PROGxx.