TCP關閉全狀態記錄

 關閉時狀態轉變:併發 client:   Fin_wait_1 -> Fin_wait_2 -> Time_wait -> closedsocket server: Close_wait -> Last_ack -> closedtcp   Fin_wait_1 發生在client 發出Fin包後, 並等待server 回 ack 時.高併發 Fin_wait_2 發生在client收到ack包

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