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<div class="refentry">
<a name="boost.process.child"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Class child</span></h2>
<p>boost::process::child</p>
</div>
<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.child_hpp" title="Header <boost/process/child.hpp>">boost/process/child.hpp</a>>
</span>
<span class="keyword">class</span> <a class="link" href="child.html" title="Class child">child</a> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
<span class="comment">// <a class="link" href="child.html#boost.process.childconstruct-copy-destruct">construct/copy/destruct</a></span>
<span class="keyword">explicit</span> <a class="link" href="child.html#idp39680208-bb"><span class="identifier">child</span></a><span class="special">(</span><span class="identifier">pid_t</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="child.html#idp39682480-bb"><span class="identifier">child</span></a><span class="special">(</span><a class="link" href="child.html" title="Class child">child</a> <span class="special">&&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span><span class="special">...</span> Args<span class="special">></span> <span class="keyword">explicit</span> <a class="link" href="child.html#idp39684000-bb"><span class="identifier">child</span></a><span class="special">(</span><span class="identifier">Args</span> <span class="special">&&</span><span class="special">...</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="child.html#idp39686656-bb"><span class="identifier">child</span></a><span class="special">(</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">default</span><span class="special">;</span>
<a class="link" href="child.html" title="Class child">child</a> <span class="special">&</span> <a class="link" href="child.html#idp39687536-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><a class="link" href="child.html" title="Class child">child</a> <span class="special">&&</span><span class="special">)</span><span class="special">;</span>
<a class="link" href="child.html#idp39689568-bb"><span class="special">~</span><span class="identifier">child</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="comment">// <a class="link" href="child.html#idp39640288-bb">private member functions</a></span>
<span class="keyword">void</span> <a class="link" href="child.html#idp39640784-bb"><span class="identifier">detach</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">void</span> <a class="link" href="child.html#idp39642000-bb"><span class="identifier">join</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">bool</span> <a class="link" href="child.html#idp39643248-bb"><span class="identifier">joinable</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">native_handle_t</span> <a class="link" href="child.html#idp39644384-bb"><span class="identifier">native_handle</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">int</span> <a class="link" href="child.html#idp39645760-bb"><span class="identifier">exit_code</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="identifier">pid_t</span> <a class="link" href="child.html#idp39647264-bb"><span class="identifier">id</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">bool</span> <a class="link" href="child.html#idp39648640-bb"><span class="identifier">running</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">bool</span> <a class="link" href="child.html#idp39649776-bb"><span class="identifier">running</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
<span class="keyword">void</span> <a class="link" href="child.html#idp39651936-bb"><span class="identifier">wait</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">void</span> <a class="link" href="child.html#idp39653072-bb"><span class="identifier">wait</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Rep<span class="special">,</span> <span class="keyword">typename</span> Period<span class="special">></span>
<span class="keyword">bool</span> <a class="link" href="child.html#idp39655232-bb"><span class="identifier">wait_for</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">duration</span><span class="special"><</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span> <span class="special">></span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">bool</span> <a class="link" href="child.html#idp39658704-bb"><span class="identifier">wait_for</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">duration</span><span class="special"><</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</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">error_code</span> <span class="special">&</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Clock<span class="special">,</span> <span class="keyword">typename</span> Duration<span class="special">></span>
<span class="keyword">bool</span> <a class="link" href="child.html#idp39661488-bb"><span class="identifier">wait_until</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">time_point</span><span class="special"><</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span> <span class="special">></span> <span class="special">&</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">bool</span> <a class="link" href="child.html#idp39664960-bb"><span class="identifier">wait_until</span></a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">time_point</span><span class="special"><</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</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">error_code</span> <span class="special">&</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
<span class="keyword">bool</span> <a class="link" href="child.html#idp39667744-bb"><span class="identifier">valid</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">explicit</span> <a class="link" href="child.html#idp39669760-bb"><span class="keyword">operator</span> <span class="keyword">bool</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">bool</span> <a class="link" href="child.html#idp39671376-bb"><span class="identifier">in_group</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">bool</span> <a class="link" href="child.html#idp39672832-bb"><span class="identifier">in_group</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
<span class="keyword">void</span> <a class="link" href="child.html#idp39674992-bb"><span class="identifier">terminate</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
<span class="keyword">void</span> <a class="link" href="child.html#idp39677920-bb"><span class="identifier">terminate</span></a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idp413974576"></a><h2>Description</h2>
<p>The main class to hold a child process. It is simliar to <a href="http://en.cppreference.com/w/cpp/thread/thread" target="_top">std::thread</a>, in that it has a join and detach function.</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>The destructor will call terminate on the process if not joined or detached without any warning. </p></td></tr>
</table></div>
<p>
</p>
<div class="refsect2">
<a name="idp413976864"></a><h3>
<a name="boost.process.childconstruct-copy-destruct"></a><code class="computeroutput">child</code>
public
construct/copy/destruct</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">explicit</span> <a name="idp39680208-bb"></a><span class="identifier">child</span><span class="special">(</span><span class="identifier">pid_t</span> <span class="special">&</span> pid<span class="special">)</span><span class="special">;</span></pre>
<p>Construct the child from a pid.</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>There is no guarantee that this will work. The process need the right access rights, which are very platform specific. </p></td></tr>
</table></div>
<p>
</p>
</li>
<li class="listitem">
<pre class="literallayout"><a name="idp39682480-bb"></a><span class="identifier">child</span><span class="special">(</span><a class="link" href="child.html" title="Class child">child</a> <span class="special">&&</span> lhs<span class="special">)</span><span class="special">;</span></pre>
<p>Move-Constructor. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span><span class="special">...</span> Args<span class="special">></span> <span class="keyword">explicit</span> <a name="idp39684000-bb"></a><span class="identifier">child</span><span class="special">(</span><span class="identifier">Args</span> <span class="special">&&</span><span class="special">...</span> args<span class="special">)</span><span class="special">;</span></pre>
<p>Construct a child from a property list and launch it The standard version is to create a subprocess, which will spawn the process. </p>
</li>
<li class="listitem">
<pre class="literallayout"><a name="idp39686656-bb"></a><span class="identifier">child</span><span class="special">(</span><span class="special">)</span> <span class="special">=</span> <span class="keyword">default</span><span class="special">;</span></pre>
<p>Construct an empty child. </p>
</li>
<li class="listitem">
<pre class="literallayout"><a class="link" href="child.html" title="Class child">child</a> <span class="special">&</span> <a name="idp39687536-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><a class="link" href="child.html" title="Class child">child</a> <span class="special">&&</span> lhs<span class="special">)</span><span class="special">;</span></pre>
<p>Move assign. </p>
</li>
<li class="listitem">
<pre class="literallayout"><a name="idp39689568-bb"></a><span class="special">~</span><span class="identifier">child</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Destructor. </p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>Will call terminate (without warning) when the child was neither joined nor detached. </p></td></tr>
</table></div>
<p>
</p>
</li>
</ol></div>
</div>
<div class="refsect2">
<a name="idp414018784"></a><h3>
<a name="idp39640288-bb"></a><code class="computeroutput">child</code> private member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idp39640784-bb"></a><span class="identifier">detach</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Detach the child, i.e. let it run after this handle dies. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idp39642000-bb"></a><span class="identifier">join</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Join the child. This just calls wait, but that way the naming is similar to std::thread </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="idp39643248-bb"></a><span class="identifier">joinable</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Check if the child is joinable. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">native_handle_t</span> <a name="idp39644384-bb"></a><span class="identifier">native_handle</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Get the native handle for the child process. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">int</span> <a name="idp39645760-bb"></a><span class="identifier">exit_code</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Get the exit_code. The return value is without any meaning if the child wasn't waited for or if it was terminated. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">pid_t</span> <a name="idp39647264-bb"></a><span class="identifier">id</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Get the Process Identifier. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="idp39648640-bb"></a><span class="identifier">running</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Check if the child process is running. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="idp39649776-bb"></a><span class="identifier">running</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</span> ec<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idp39651936-bb"></a><span class="identifier">wait</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Wait for the child process to exit. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idp39653072-bb"></a><span class="identifier">wait</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</span> ec<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Rep<span class="special">,</span> <span class="keyword">typename</span> Period<span class="special">></span>
<span class="keyword">bool</span> <a name="idp39655232-bb"></a><span class="identifier">wait_for</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">duration</span><span class="special"><</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span> <span class="special">></span> <span class="special">&</span> rel_time<span class="special">)</span><span class="special">;</span></pre>
<p>Wait for the child process to exit for a period of time.
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>True if child exited while waiting. </p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="idp39658704-bb"></a><span class="identifier">wait_for</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">duration</span><span class="special"><</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span> <span class="special">></span> <span class="special">&</span> rel_time<span class="special">,</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</span> ec<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Clock<span class="special">,</span> <span class="keyword">typename</span> Duration<span class="special">></span>
<span class="keyword">bool</span> <a name="idp39661488-bb"></a><span class="identifier">wait_until</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">time_point</span><span class="special"><</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span> <span class="special">></span> <span class="special">&</span> timeout_time<span class="special">)</span><span class="special">;</span></pre>
<p>Wait for the child process to exit until a point in time.
</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
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<td><p><span class="term">Returns:</span></p></td>
<td><p>True if child exited while waiting. </p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="idp39664960-bb"></a><span class="identifier">wait_until</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">time_point</span><span class="special"><</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span> <span class="special">></span> <span class="special">&</span> timeout_time<span class="special">,</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</span> ec<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="idp39667744-bb"></a><span class="identifier">valid</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Check if this handle holds a child process. </p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>That does not mean, that the process is still running. It only means, that the handle does or did exist. </p></td></tr>
</table></div>
<p>
</p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">explicit</span> <a name="idp39669760-bb"></a><span class="keyword">operator</span> <span class="keyword">bool</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Same as valid, for convenience. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="idp39671376-bb"></a><span class="identifier">in_group</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>Check if the the chlid process is in any process group. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">bool</span> <a name="idp39672832-bb"></a><span class="identifier">in_group</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</span> ec<span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idp39674992-bb"></a><span class="identifier">terminate</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<p>Terminate the child process.</p>
<p>This function will cause the child process to unconditionally and immediately exit. It is implement with <a href="http://pubs.opengroup.org/onlinepubs/009695399/functions/kill.html" target="_top">SIGKILL</a> on posix and <a href="https://technet.microsoft.com/en-us/library/ms686714.aspx" target="_top">TerminateProcess</a> on windows. </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">void</span> <a name="idp39677920-bb"></a><span class="identifier">terminate</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&</span> ec<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
<p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
</li>
</ol></div>
</div>
</div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="right"><div class="copyright-footer">Copyright © 2006-2012 Julio M. Merino Vidal, Ilya Sokolov,
Felipe Tanus, Jeff Flinn, Boris Schaeling<br>Copyright © 2016 Klemens D. Morgenstern<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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