验证套接字的条件和连接的状态，并确定传递消息和报告错误所需的空间。
Validates the conditions of the socket and the state of the connection, and determines the space needed to pass on the message and report errors.
验证套接字的条件和连接的状态，并确定传递消息和报告错误所需的空间。
Validates the conditions of the socket and the state of the connection, and determines the space needed to pass on the message and report errors.
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