Storage control XPI functions

The XPI provides seven storage control functions. These are the DFHSMMCX macro calls GETMAIN, FREEMAIN, INQUIRE_ELEMENT_LENGTH, and INQUIRE_TASK_STORAGE, and the DFHSMSRX calls INQUIRE_ACCESS, INQUIRE_SHORT_ON_STORAGE, and SWITCH_SUBSPACE.

DFHSMMCX calls cannot be used in any exit program invoked from any global user exit point in the following domains or program:
  • Dispatcher domain
  • Dump domain
  • Monitor domain
  • Statistics domain
  • Transient data program.