</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span> <span class="identifier">ec</span><span class="special">);</span>
</pre>
<p>
            This function is used to execute an IO control command on the socket.
          </p>
<h6>
<a name="boost_asio.reference.basic_socket_streambuf.io_control.overload2.h0"></a>
            <span><a name="boost_asio.reference.basic_socket_streambuf.io_control.overload2.para