def always_read_fd(self):
        """Return an fd that is always ready for read when passed to select.select. See fileno for why this is needed."""
        if ConnectionWrapper._always_read_fd:
            return ConnectionWrapper._always_read_fd
        ConnectionWrapper._always_read_fd = open("/dev/zero")
        return ConnectionWrapper._always_read_fd
Return an fd that is always ready for read when passed to select.select. See fileno for why this is needed.
nogotofail/mitm/connection/connection.py