The RACROUTE REQUEST=DEFINE preprocessing exit routine must be named ICHRDX01. It is entered before the definition, modification, or deletion of resource profiles.

The exit must be reentrant and is invoked in supervisor state, with protection key 0, with no locks held.

The exit can have any RMODE, but AMODE should be AMODE(31) or AMODE(ANY) for the best use of virtual storage and best RACF® performance.

When the RACROUTE REQUEST=DEFINE preprocessing exit receives control for the DATASET class, RACF has already processed the naming convention table, if there is one.

z/OS Security Server RACF Data Areas contains a mapping of the RACROUTE REQUEST=DEFINE exit parameter list, RDXP.