The exit routines can run in either 24-bit or 31-bit addressing mode. If they operate in 24-bit mode, consider the following:

For create, extend, and partial release, the DADSM caller passes the address of the job file control block (JFCB), or of a copy of the JFCB, in the IEXPTR1 field of the parameter list. It might be a 31-bit address, so if your exit routine is called for either create, extend, or partial release, and the JFCB resides above the 16MB line, your routine must be in 31-bit addressing mode before using the IEXPTR1 field.

Please note that the references to IGGPRE00 and IGGPOST0 in the following sections generically refer to the exit routine(s) that have been added to the IGGPRE00_EXIT and IGGPOST0_EXIT dynamic exits. The system will add IGGPRE00 and IGGPOST0 as exit routines, but others could be added.