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    <p>Normal TCP Connection is a four way handshake.</p> <p><a href="http://en.wikipedia.org/wiki/Transmission_Control_Protocol" rel="nofollow">http://en.wikipedia.org/wiki/Transmission_Control_Protocol</a></p> <p>When you are killing the client the <strong>FIN</strong> segment is sent from the client side to the server and the server protocol stack sends the <strong>ACK</strong>.</p> <p>Here if the server tried to read data, the read call would return a value of 0, so your server program can understand that the peer has closed and normally would close the connection socket after this. This would allow the <strong>FIN</strong> from the server side to be sent and normal 4 way handshake would get completed after the receipt of the last <strong>ACK</strong> from the client side.</p> <p>(Pl read Q 2.1 of <a href="http://www.faqs.org/faqs/unix-faq/socket/" rel="nofollow">http://www.faqs.org/faqs/unix-faq/socket/</a>)</p> <p>But here you are writing data from the server, so the server is getting a <strong>RESET</strong> from the client only after sending data. So you are getting the error after the first send operation that is on the second send.</p> <p>So, pl. try closing the connection from the client side <strong>abruptly</strong> instead of 4 way handsake, by setting the the linger option and timeout to 0, so that you can get a error(may be different from EPIPE) on the first call of send on the server side.(This is not a recommnended practise but only for your understanding in this particular case)</p> <pre><code>Try the following option of nc, nc -L 0 to set the linger option and timeout to 0 </code></pre> <p>(I have not tried this option of nc, pl. check for details in this link <a href="http://docs.oracle.com/cd/E23824_01/html/821-1461/nc-1.html" rel="nofollow">http://docs.oracle.com/cd/E23824_01/html/821-1461/nc-1.html</a>)</p> <p>Example of nc from the above site, </p> <pre><code>Connect to TCP port, send some data and terminate the connection with TCP RST segment (instead of classic TCP closing handshake) by setting the linger option and timeout to 0: $ echo "foo" | nc -L 0 host.example.com 22 </code></pre>
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    1. POBroken pipe only at the second send on a closed socket
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    1. USTanmoy Bandyopadhyay
    1. USTanmoy Bandyopadhyay
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    1. COThanks for your answer, detailed and clear. Unfortunately I can't test the nc option you suggested me because the command on my Linux machine doesn't seem to support it. By the way the documentation you pointed me to and the explainations you gave me are clear and useful. Thanks!
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