Class SocketWrapper

python/python3/tornado/test/ioloop_test.py:265–275

        # Unfortunately, sockets don't support the .closed attribute for
        # inspecting their close status, so we must use a wrapper.
        class SocketWrapper(object):
            def __init__(self, sockobj):
                self.sockobj = sockobj
                self.closed = False

            def fileno(self):
                return self.sockobj.fileno()

            def close(self):
                self.closed = True
                self.sockobj.close()

        sockobj, port = bind_unused_port()
        socket_wrapper = SocketWrapper(sockobj)