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autodoc.git/traditional_manual/chapter_9.html:130:    machine.</p>   <p> A local IP and port can be explicitly bound by specifying    <code>client</code> and <code>client_port</code>.</p>   <p> If the <code>data</code> argument is included the socket will use    TCP_FAST_OPEN if posible. In this mode the the function will    return the part of the data that has not been sent to the remote    server yet instead of 1 (you will have to use <code>write</code> to send    this data).</p>   <p> Note that TCP_FAST_OPEN requires server support, the connection    might fail even though the remote server exists. It might be -  advicable to retry without TCP_FAST_OPEN (and remember this +  advisable to retry without TCP_FAST_OPEN (and remember this    fact)</p>   </dd>   <dt class='head--doc'>Returns</dt>   <dd class='body--doc'><p>This function returns 1 or the remaining <code>data</code> for success, 0    otherwise.</p>   </dd>   <dt class='head--doc'>Note</dt>   <dd class='body--doc'><p>In nonblocking mode <code class='expr'>0</code> (zero) may be returned and    <code>errno()</code> set to <code class='expr'>EWOULDBLOCK</code> or <code class='expr'>WSAEWOULDBLOCK</code>.</p>   <p> This should not be regarded as a