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内核中关于TCPsocket状态的描述
发布时间：2010/12/19 0:33:22 来源：城市学习网 编辑：ziteng
　net/ipv4/tcp.c

　　* Description of States:

　　*

　　*    TCP_SYN_SENT        sent a connection request, waiting for ack

　　*

　　*    TCP_SYN_RECV        received a connection request, sent ack,

　　*                waiting for final ack in three-way handshake.

　　*

　　*    TCP_ESTABLISHED        connection established

　　*

　　*    TCP_FIN_WAIT1        our side has shutdown, waiting to complete

　　*                transmission of remaining buffered data

　　*

　　*    TCP_FIN_WAIT2        all buffered data sent, waiting for remote

　　*                to shutdown

　　*

　　*    TCP_CLOSING        both sides have shutdown but we still have

　　*                data we have to finish sending

　　*

　　*    TCP_TIME_WAIT        timeout to catch resent junk before entering

　　*                closed, can only be entered from FIN_WAIT2

　　*                or CLOSING.  Required because the other end

　　*                may not have gotten our last ACK causing it

　　*                to retransmit the data packet (which we ignore)

　　*

　　*    TCP_CLOSE_WAIT        remote side has shutdown and is waiting for

　　*                us to finish writing our data and to shutdown

　　*                (we have to close() to move on to LAST_ACK)

　　*

　　*    TCP_LAST_ACK        out side has shutdown after remote has

　　*                shutdown.  There may still be data in our

　　*                buffer that we have to finish sending

　　*

　　*    TCP_CLOSE        socket is finished

　　*/

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