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<h2><span class="refentrytitle">Global on_exit</span></h2>
<p>boost::process::on_exit</p>
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<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="../../process/reference.html#header.boost.process.async_hpp" title="Header <boost/process/async.hpp>">boost/process/async.hpp</a>>
</span><span class="keyword">static</span> <span class="emphasis"><em><span class="identifier">unspecified</span></em></span> on_exit<span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idp429212512"></a><h2>Description</h2>
<p>When an io_service is passed, the on_exit property can be used, to be notified when the child process exits.</p>
<p>The following syntax is valid</p>
<pre class="programlisting"><span class="identifier">on_exit</span><span class="special">=</span><span class="identifier">function</span><span class="special">;</span>
<span class="identifier">on_exit</span><span class="special">(</span><span class="identifier">function</span><span class="special">)</span><span class="special">;</span>
</pre>
<p>with <code class="computeroutput">function</code> being a callable object with the signature <code class="computeroutput">(int, const std::error_code&)</code> or an <code class="computeroutput">std::future<int></code>.</p>
<p><b>Example. </b></p>
<p>
</p>
<pre class="programlisting"><span class="identifier">io_service</span> <span class="identifier">ios</span><span class="special">;</span>
<span class="identifier">child</span> <span class="identifier">c</span><span class="special">(</span><span class="string">"ls"</span><span class="special">,</span> <span class="identifier">on_exit</span><span class="special">=</span><span class="special">[</span><span class="special">]</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">exit</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">&</span> <span class="identifier">ec_in</span><span class="special">)</span><span class="special">{</span><span class="special">}</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">future</span><span class="special"><</span><span class="keyword">int</span><span class="special">></span> <span class="identifier">exit_code</span><span class="special">;</span>
<span class="identifier">chlid</span> <span class="identifier">c2</span><span class="special">(</span><span class="string">"ls"</span><span class="special">,</span> <span class="identifier">on_exit</span><span class="special">=</span><span class="identifier">exit_code</span><span class="special">)</span><span class="special">;</span>
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