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Full Discussion: How detect TCP/IP socket shutdown when ethernet cable is disconnected
Top Forums Programming How detect TCP/IP socket shutdown when ethernet cable is disconnected Post 302435674 by jeje_clb on Thursday 8th of July 2010 02:03:20 AM
Old 07-08-2010
Hi gratuitous_arp

SIOCETHTOOL ioctl command allow to know is physical connection is present.

I my case, I have physical connection with a switch but the connection between the distant equipment will be broken during exchange. So, the TCP acknowledge will not be receive, TCP request will be resend as soon as tcp_retry is reach. After these retry, even if I have asked to send more data with the send command, no more data will be send from my computer to the distant computer (no more traces with tcpdump). After about 15 minutes, the recv command return with error "no route to host". But, I wanted to detect the socket disconnection after some secondes.

If you have any other idea, don't hesitate to propose it.

Regards
 

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LEARN ABOUT CENTOS

tapset::tcp

tapset::tcp(3stap)														tapset::tcp(3stap)

NAME

       tapset::tcp - systemtap tcp tapset

DESCRIPTION

	This family of probe points is used to probe events that occur in the TCP layer,

       tcp.sendmsg
	      Sending a tcp message

	       See probe::tcp.sendmsg(3stap)
	       for details.

       tcp.sendmsg.return
	       Sending TCP message is done

	       See probe::tcp.sendmsg.return(3stap)
	       for details.

       tcp.recvmsg
	      Receiving TCP message

	       See probe::tcp.recvmsg(3stap)
	       for details.

       tcp.recvmsg.return
	      Receiving TCP message complete

	       See probe::tcp.recvmsg.return(3stap)
	       for details.

       tcp.disconnect
	      TCP socket disconnection

	       See probe::tcp.disconnect(3stap)
	       for details.

       tcp.disconnect.return
	      TCP socket disconnection complete

	       See probe::tcp.disconnect.return(3stap)
	       for details.

       tcp.setsockopt
	      Call to setsockopt()

	       See probe::tcp.setsockopt(3stap)
	       for details.

       tcp.setsockopt.return
	       Return from setsockopt()

	       See probe::tcp.setsockopt.return(3stap)
	       for details.

       tcp.receive
	      Called when a TCP packet is received

	       See probe::tcp.receive(3stap)
	       for details.

SEE ALSO

	  probe::tcp.sendmsg(3stap),	  probe::tcp.sendmsg.return(3stap),	 probe::tcp.recvmsg(3stap),    probe::tcp.recvmsg.return(3stap),
       probe::tcp.disconnect(3stap),  probe::tcp.disconnect.return(3stap),  probe::tcp.setsockopt(3stap),   probe::tcp.setsockopt.return(3stap),
       probe::tcp.receive(3stap),  stap(1), stapprobes(3stap)

IBM
									---							tapset::tcp(3stap)
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