VMS Help TCPIP Services, Programming Interfaces, RPC Server Routines, svc_destroy, Description  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    The svc_destroy routine returns all the private data structures
    associated with a server handle. If the server handle creation
    routine received the value RPC_ANYSOCK as the socket, svc_destroy
    closes the socket. Otherwise, your program must close the socket.