Using DFSMSrmm installation exits

DFSMSrmm provides these installation exits to allow you to customize selected DFSMSrmm functions:

EDG_EXIT100: Described in Using the DFSMSrmm EDG_EXIT100 installation exit.
EDG_EXIT200: Described in Using the EDG_EXIT200 installation exit.
EDG_EXIT300: Described in Using the EDG_EXIT300 installation exit.

When you assemble DFSMSrmm installation exits, the IBM-supplied default assembler options should be used, unless noted otherwise. Ensure that the ALIGN option is in effect.

DFSMSrmm uses the services of the z/OS Dynamic Exit Facility for all of its installation exits. This permits the use of multiple installation exit routines for each DFSMSrmm exits and enables you to control these exits and their exit routines with the EXIT statement of the PROGxx parmlib member, the SET PROG=xx operator command, the SETPROG EXIT operator command, or the CSVDYNEX macro.

DFSMSrmm uses Dynamic Exit Services to load and activate the default exit module, if found in the LINKLIST, for each exit at initialization time. The default exit module is activated in first position. If you do not use the default exit module, you must specify your own exit module with PROGxx in z/OS parmlib, or the SETPROG operator command, or the CSVDYNEX macro.

If a problem occurs during definition of the dynamic exits or activation of the default exits, DFSMSrmm startup provides the operator with a choice of actions; CANCEL, RETRY, or CONTINUE.

You can use the ADDABENDNUM and ABENDCONSEC parameters on the CSVDYNEX REQUEST=ADD macro or the ABENDNUM parameter of the SETPROG EXIT operator command to limit the number of times the exit routine abnormally ends before it becomes inactive. An abend is counted when both of the following conditions exist:

The exit routine does not provide recovery, or the exit routine does provide recovery but percolates the error.
The system allows a retry; that is, the recovery routine is entered with bit SDWACLUP off.

By default, the system disables the exit routines for EDG_EXIT300 after one abend. By default, the system does not disable the exit routines for EDG_EXIT100 and EDG_EXIT200.

DFSMSrmm installation exit modules can be loaded from any APF authorized library. The default is the LINKLST.

For information about the:

Dynamic Exit Facility, see z/OS MVS Installation Exits.
CSVDYNEX macro, see z/OS MVS Programming: Authorized Assembler Services Guide.
PROGxx parmlib member, see z/OS MVS Initialization and Tuning Guide.
D PROG, SETPROG EXIT, and SET PROG=xx commands, see z/OS MVS System Commands.