Description

   Takes in the address of an uwind information block (UIB) and the
   GP value for a routine and returns the addresses of the start of
   the unwind descriptors (if any), the handler function descriptor
   (if any), and the operating system-specific data area (if any).
   The size in bytes of the unwind descriptors is also returned.

   Related Services

   SYS$SET_UNWIND_TABLE, SYS$CLEAR_UNWIND_TABLE, SYS$GET_UNWIND_
   ENTRY_INFO,