VMS Help TCPIP Services, Programming Interfaces, Sockets API, getsockname(), Errors  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    EBADF              The descriptor is invalid.
    EFAULT             The name argument is not a valid part of the
                       user address space.
    ENOBUFS            The system has insufficient resources to
                       complete the call.
    ENOTSOCK           The socket descriptor is invalid.
    EOPNOTSUPP         The operation is not supported for this
                       socket's protocol.