TCP关闭全状态记录

 关闭时状态转变:并发 client:   Fin_wait_1 -> Fin_wait_2 -> Time_wait -> closedsocket server: Close_wait -> Last_ack -> closedtcp   Fin_wait_1 发生在client 发出Fin包后, 并等待server 回 ack 时.高并发 Fin_wait_2 发生在client收到ack包

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