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copied!<p>I am not a TCP/IP expert, but I did notice that this documentation says <code>EPIPE</code> can still be returned even when MSG_NOSIGNAL is set with a 'stream oriented socket'. It looks like you are creating your socket with <code>SOCK_STREAM</code>. The other end may be breaking the connection.</p> <p>In <code>CBSocketConnect()</code> it looks like if you get <code>EINPROGRESS</code> you just return true-- which you also return if it connects successfully. You would have no way of knowing if you needed to wait for the connection to finish. According to <a href="http://www.kernel.org/doc/man-pages/online/pages/man2/connect.2.html" rel="nofollow noreferrer">this</a> you could <code>select()</code> or <code>poll()</code> for connection completion.</p> <hr> <p>The above is a repost of my comments from the OP at the request of @MatthewMitchell and @user315052.</p> <hr> <p><strong>Edit:</strong> <a href="https://stackoverflow.com/users/315052/user315052">I</a> am adding a more detailed description of <a href="https://stackoverflow.com/a/12068942/315052">this answer</a>, and some of the discussion that followed.</p> <p>So, first try to do the <code>connect()</code>. Then, if <code>EINPROGRESS</code> is the error result, register for a write event wakeup from <code>libevent</code>. After getting into the callback function for <code>EV_WRITE</code>, check to see the status of the connection with <code>getsockopt()</code> with socket option <code>SO_ERROR</code> at level <code>SOL_SOCKET</code>. If the option value returned is <code>0</code>, the connection has succeeded. Otherwise, treat it as an <code>errno</code> number.</p> <p>After following this advice as illustrated in <a href="https://stackoverflow.com/a/12068942/315052">this answer</a>, you discovered that the client encountered the error <code>ECONNREFUSED</code>. This explains why your writes were failing with <code>EPIPE</code>. After investigating your server, you found that the server was not able to listen to the bound address because of the error <code>EADDRINUSE</code>. This can be dealt with by setting the <code>SO_REUSEADDR</code> option on the listening socket.</p>

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