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| <div class="titlepage"><div><div><h3 class="title"> |
| <a name="boost_asio.overview.signals"></a><a class="link" href="signals.html" title="Signal Handling">Signal Handling</a> |
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| <p> |
| Boost.Asio supports signal handling using a class called <a class="link" href="../reference/signal_set.html" title="signal_set">signal_set</a>. |
| Programs may add one or more signals to the set, and then perform an <code class="computeroutput"><span class="identifier">async_wait</span><span class="special">()</span></code> |
| operation. The specified handler will be called when one of the signals occurs. |
| The same signal number may be registered with multiple <a class="link" href="../reference/signal_set.html" title="signal_set">signal_set</a> |
| objects, however the signal number must be used only with Boost.Asio. |
| </p> |
| <pre class="programlisting"><span class="keyword">void</span> <span class="identifier">handler</span><span class="special">(</span> |
| <span class="keyword">const</span> <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">&</span> <span class="identifier">error</span><span class="special">,</span> |
| <span class="keyword">int</span> <span class="identifier">signal_number</span><span class="special">)</span> |
| <span class="special">{</span> |
| <span class="keyword">if</span> <span class="special">(!</span><span class="identifier">error</span><span class="special">)</span> |
| <span class="special">{</span> |
| <span class="comment">// A signal occurred.</span> |
| <span class="special">}</span> |
| <span class="special">}</span> |
| |
| <span class="special">...</span> |
| |
| <span class="comment">// Construct a signal set registered for process termination.</span> |
| <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">signal_set</span> <span class="identifier">signals</span><span class="special">(</span><span class="identifier">io_service</span><span class="special">,</span> <span class="identifier">SIGINT</span><span class="special">,</span> <span class="identifier">SIGTERM</span><span class="special">);</span> |
| |
| <span class="comment">// Start an asynchronous wait for one of the signals to occur.</span> |
| <span class="identifier">signals</span><span class="special">.</span><span class="identifier">async_wait</span><span class="special">(</span><span class="identifier">handler</span><span class="special">);</span> |
| </pre> |
| <p> |
| Signal handling also works on Windows, as the Microsoft Visual C++ runtime |
| library maps console events like Ctrl+C to the equivalent signal. |
| </p> |
| <a name="boost_asio.overview.signals.see_also"></a><h5> |
| <a name="boost_asio.overview.signals.see_also-heading"></a> |
| <a class="link" href="signals.html#boost_asio.overview.signals.see_also">See Also</a> |
| </h5> |
| <p> |
| <a class="link" href="../reference/signal_set.html" title="signal_set">signal_set</a>, <a class="link" href="../examples.html#boost_asio.examples.http_server">HTTP server example</a>. |
| </p> |
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| <td align="right"><div class="copyright-footer">Copyright © 2003-2011 Christopher |
| M. Kohlhoff<p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 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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