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

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。

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Buf_read_callback : Called when the client socket has data to be read.

buf_read _ callback：当客户端套接字有要读的数据时调用它。

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Holds all the client data (socket, client data, etc.).

保存所有客户端数据(socket，客户端数据，等等)。

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