IPCS Data Areas, Macros, and Mapping Macros to be Used by IPCS Exit Routines

For IPCS and ABEND/SNAP Formatting
When writing an exit routine, do not define any persistent data areas. Any storage that the routine obtains with the GETMAIN macro should be released with a FREEMAIN macro before the routine completes processing.

IPCS provides mapping macros to map data areas needed to write IPCS exit routines and access IPCS exit services. IPCS also provides macros used to write certain IPCS exit routines.

References
See the following:
- IPCS Macros and Mapping Macros for information about the IPCS macros and mapping macros needed to write IPCS exit routines
- z/OS MVS Programming: Assembler Services Reference ABE-HSP for information coding the macros
- For macro mappings, see z/OS MVS™ Data Areas in the z/OS® Internet Library: &zosliburl; and z/OS TSO/E System Diagnosis: Data Areas.
For ABEND/SNAP Formatting
Data areas may be defined by coding the DATA statement in the BLSCUSER parmlib member. To format BLSCUSER-defined data areas, code a SNAP exit routine.

Reference

See z/OS MVS Installation Exits for information about writing SNAP exit routines.