121 lines
5.2 KiB
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121 lines
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<title>Signal handler requirements</title>
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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_asio.reference.SignalHandler"></a><a class="link" href="SignalHandler.html" title="Signal handler requirements">Signal handler requirements</a>
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</h3></div></div></div>
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<p>
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A signal handler must meet the requirements for a <a class="link" href="Handler.html" title="Handlers">handler</a>.
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A value <code class="computeroutput">h</code> of a signal handler class should work correctly in
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the expression <code class="computeroutput">h(ec, n)</code>, where <code class="computeroutput">ec</code> is an lvalue
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of type <code class="computeroutput">const error_code</code> and <code class="computeroutput">n</code> is an lvalue of
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type <code class="computeroutput">const int</code>.
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<h5>
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<a name="boost_asio.reference.SignalHandler.h0"></a>
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<span class="phrase"><a name="boost_asio.reference.SignalHandler.examples"></a></span><a class="link" href="SignalHandler.html#boost_asio.reference.SignalHandler.examples">Examples</a>
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</h5>
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<p>
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A free function as a signal handler:
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</p>
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<pre class="programlisting">void signal_handler(
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const boost::system::error_code& ec,
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int signal_number)
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{
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...
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}
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</pre>
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<p>
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A signal handler function object:
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</p>
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<pre class="programlisting">struct signal_handler
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{
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...
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void operator()(
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const boost::system::error_code& ec,
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int signal_number)
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{
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...
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}
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...
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};
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</pre>
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<p>
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A lambda as a signal handler:
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</p>
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<pre class="programlisting">my_signal_set.async_wait(
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[](const boost::system::error_code& ec,
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int signal_number)
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{
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...
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});
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</pre>
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<p>
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A non-static class member function adapted to a signal handler using <code class="computeroutput">std::bind()</code>:
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</p>
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<pre class="programlisting">void my_class::signal_handler(
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const boost::system::error_code& ec,
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int signal_number)
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{
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...
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}
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...
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my_signal_set.async_wait(
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std::bind(&my_class::signal_handler,
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this, std::placeholders::_1,
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std::placeholders::_2));
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</pre>
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<p>
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A non-static class member function adapted to a signal handler using <code class="computeroutput">boost::bind()</code>:
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</p>
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<pre class="programlisting">void my_class::signal_handler(
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const boost::system::error_code& ec,
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int signal_number)
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{
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...
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}
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...
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my_signal_set.async_wait(
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boost::bind(&my_class::signal_handler,
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this, boost::asio::placeholders::error,
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boost::asio::placeholders::signal_number));
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</pre>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2021 Christopher
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M. Kohlhoff<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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