eventlet_backdoor.py 文件源码

def _listen(host, start_port, end_port, listen_func):
    try_port = start_port
    while True:
        try:
            return listen_func((host, try_port))
        except socket.error as exc:
            if (exc.errno != errno.EADDRINUSE or
                    try_port >= end_port):
                raise
            try_port += 1