If you write a program that invokes ADRDSSU and needs to use some features of the z/OS® Unix System Services, your program makes a call to z/OS UNIX through API. To connect to the kernel for z/OS UNIX, your program has to make an address space known to it. This process is called dubbing. Once dubbed, the address space is considered a thread in the z/OS Unix System Services space, and has the same security authorization as your program has. Therefore, your program and the ADRDSSU program are dubbed with your security authorization.

To avoid authorization problems, perform undub before DFSMSdss invocation. If you cannot undub before DFSMSdss invocation, undub after the ADRDSSU program has finished executing.