74 lines
5.0 KiB
HTML
74 lines
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HTML
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>Signal Handling</title>
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<link rel="stylesheet" href="../../boostbook.css" type="text/css">
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<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
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<link rel="home" href="../../index.html" title="Asio">
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<link rel="up" href="../overview.html" title="Overview">
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<link rel="prev" href="serial_ports.html" title="Serial Ports">
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</head>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
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<hr>
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<div class="spirit-nav">
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<a accesskey="p" href="serial_ports.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="channels.html"><img src="../../next.png" alt="Next"></a>
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</div>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="asio.overview.signals"></a><a class="link" href="signals.html" title="Signal Handling">Signal Handling</a>
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</h3></div></div></div>
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<p>
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Asio supports signal handling using a class called <a class="link" href="../reference/signal_set.html" title="signal_set">signal_set</a>.
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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>
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operation. The specified handler will be called when one of the signals occurs.
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The same signal number may be registered with multiple <a class="link" href="../reference/signal_set.html" title="signal_set">signal_set</a>
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objects, however the signal number must be used only with Asio.
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</p>
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<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">handler</span><span class="special">(</span>
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<span class="keyword">const</span> <span class="identifier">asio</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">&</span> <span class="identifier">error</span><span class="special">,</span>
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<span class="keyword">int</span> <span class="identifier">signal_number</span><span class="special">)</span>
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<span class="special">{</span>
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<span class="keyword">if</span> <span class="special">(!</span><span class="identifier">error</span><span class="special">)</span>
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<span class="special">{</span>
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<span class="comment">// A signal occurred.</span>
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<span class="special">}</span>
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<span class="special">}</span>
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<span class="special">...</span>
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<span class="comment">// Construct a signal set registered for process termination.</span>
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<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_context</span><span class="special">,</span> <span class="identifier">SIGINT</span><span class="special">,</span> <span class="identifier">SIGTERM</span><span class="special">);</span>
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<span class="comment">// Start an asynchronous wait for one of the signals to occur.</span>
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<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>
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</pre>
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<p>
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Signal handling also works on Windows, as the Microsoft Visual C++ runtime
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library maps console events like Ctrl+C to the equivalent signal.
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</p>
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<h5>
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<a name="asio.overview.signals.h0"></a>
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<span><a name="asio.overview.signals.see_also"></a></span><a class="link" href="signals.html#asio.overview.signals.see_also">See
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Also</a>
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</h5>
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<p>
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<a class="link" href="../reference/signal_set.html" title="signal_set">signal_set</a>, <a class="link" href="../examples/cpp03_examples.html#asio.examples.cpp03_examples.http_server">HTTP
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server example (C++03)</a>, <a class="link" href="../examples/cpp11_examples.html#asio.examples.cpp11_examples.http_server">HTTP
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server example (C++11)</a>.
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</p>
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</div>
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<div class="copyright-footer">Copyright © 2003-2023 Christopher 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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</p>
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</div>
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<hr>
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<div class="spirit-nav">
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<a accesskey="p" href="serial_ports.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../overview.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="channels.html"><img src="../../next.png" alt="Next"></a>
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