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  27 <a name="boost_asio.reference.basic_socket_acceptor.listen.overload2"></a><a class="link" href="overload2.html" title="basic_socket_acceptor::listen (2 of 2 overloads)">basic_socket_acceptor::listen
  28           (2 of 2 overloads)</a>
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  30 <p>
  31             Place the acceptor into the state where it will listen for new connections.
  32           </p>
  33 <pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">listen</span><span class="special">(</span>
  34     <span class="keyword">int</span> <span class="identifier">backlog</span><span class="special">,</span>
  35     <span class="identifier">boost</span><span class="special">::</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>
  36 </pre>
  37 <p>
  38             This function puts the socket acceptor into the state where it may accept
  39             new connections.
  40           </p>
  41 <h6>
  42 <a name="boost_asio.reference.basic_socket_acceptor.listen.overload2.h0"></a>
  43             <span class="phrase"><a name="boost_asio.reference.basic_socket_acceptor.listen.overload2.parameters"></a></span><a class="link" href="overload2.html#boost_asio.reference.basic_socket_acceptor.listen.overload2.parameters">Parameters</a>
  44           </h6>
  45 <div class="variablelist">
  46 <p class="title"><b></b></p>
  47 <dl class="variablelist">
  48 <dt><span class="term">backlog</span></dt>
  49 <dd><p>
  50                   The maximum length of the queue of pending connections.
  51                 </p></dd>
  52 <dt><span class="term">ec</span></dt>
  53 <dd><p>
  54                   Set to indicate what error occurred, if any.
  55                 </p></dd>
  56 </dl>
  57 </div>
  58 <h6>
  59 <a name="boost_asio.reference.basic_socket_acceptor.listen.overload2.h1"></a>
  60             <span class="phrase"><a name="boost_asio.reference.basic_socket_acceptor.listen.overload2.example"></a></span><a class="link" href="overload2.html#boost_asio.reference.basic_socket_acceptor.listen.overload2.example">Example</a>
  61           </h6>
  62 <pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">acceptor</span> <span class="identifier">acceptor</span><span class="special">(</span><span class="identifier">io_service</span><span class="special">);</span>
  63 <span class="special">...</span>
  64 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span> <span class="identifier">ec</span><span class="special">;</span>
  65 <span class="identifier">acceptor</span><span class="special">.</span><span class="identifier">listen</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">socket_base</span><span class="special">::</span><span class="identifier">max_connections</span><span class="special">,</span> <span class="identifier">ec</span><span class="special">);</span>
  66 <span class="keyword">if</span> <span class="special">(</span><span class="identifier">ec</span><span class="special">)</span>
  67 <span class="special">{</span>
  68   <span class="comment">// An error occurred.</span>
  69 <span class="special">}</span>
  70 </pre>
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