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将此新的套接字连接到客户端，使另外一个套接字 s 保持 LISTEN 状态，以接受进一步连接。

This new socket is connected to the client and the other socket s remains in LISTEN state to accept further connections.

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每当对应的客户端套接字包含读、写或错误操作时，调用对应的回调函数。

Each time a corresponding client socket contains any read, write or error operations, the corresponding callback function is called.

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