On a blocking connection, a return of 0 means that the connection was closed, while -1 indicates that an error occurred.
在受阻塞的连接中，该函数返回 0，表示连接已经关闭，而 -1 则表示连接出现错误。
An error occurred while renewing interface local area connection: an operation was attempted on something that is not a socket.
更新介面的区域连线时发生错误：尝试操作的对象不是通讯端。
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