Figure 1 illustrates the parameter structure for the ACS installation exits. A 4 KB work area exists on a doubleword boundary for each ACS installation exit. You can use this work area to satisfy the reentrant requirement. The following macros map the parameters that are passed to each ACS installation exit:

IGDACERO

Maps the read-only variables that the ACS exit can reference when selecting an SMS class.

IGDACERW

Maps the read-write variables that the ACS exit can set when selecting an SMS class.

IGDACSPM

Describes the parameter list for an ACS installation exit.

Figure 1. Parameter Structure for the ACS Installation Exits. This figure shows the control block structure upon entry into the exit. All offsets are in hexadecimal.