Your subsystem can use SSI function code 8 to clean up any system-level resources which your subsystem obtained for one or more address spaces. Because private storage for the address space has already been deleted, your function routine must not reference any storage in the ending address space.

Because your function routine gets control for every address space that ends, using your own subsystem may not be the most efficient way to do your own clean up for ending address spaces. IBM® recommends that you define your own resource manager through the use of the RESMGR macro. You can use RESMGR to receive control for specific ending address spaces, rather than having to check each ending task or address space to see if it used the subsystem. For a general description of resource managers and how they can be defined at both IPL time and dynamically, see z/OS MVS Programming: Authorized Assembler Services Guide.