Method close_fd

python/python3/tornado/iostream.py:1128–1130

(self)

        return self.socket

    def close_fd(self) -> None:
        self.socket.close()
        self.socket = None  # type: ignore

    def get_fd_error(self) -> Optional[Exception]:
        errno = self.socket.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)