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  26 <div class="refentry">
  27 <a name="boost.process.child"></a><div class="titlepage"></div>
  28 <div class="refnamediv">
  29 <h2><span class="refentrytitle">Class child</span></h2>
  30 <p>boost::process::child</p>
  31 </div>
  32 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  33 <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../process/reference.html#header.boost.process.child_hpp" title="Header &lt;boost/process/child.hpp&gt;">boost/process/child.hpp</a>&gt;
  34
  35 </span>
  36 <span class="keyword">class</span> <a class="link" href="child.html" title="Class child">child</a> <span class="special">{</span>
  37 <span class="keyword">public</span><span class="special">:</span>
  38   <span class="comment">// <a class="link" href="child.html#boost.process.childconstruct-copy-destruct">construct/copy/destruct</a></span>
  39   <span class="keyword">explicit</span> <a class="link" href="child.html#idm45170605221520-bb"><span class="identifier">child</span></a><span class="special">(</span><span class="identifier">pid_t</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  40   <a class="link" href="child.html#idm45170605219120-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">&amp;&amp;</span><span class="special">)</span><span class="special">;</span>
  41   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="special">...</span> Args<span class="special">&gt;</span> <span class="keyword">explicit</span> <a class="link" href="child.html#idm45170605217600-bb"><span class="identifier">child</span></a><span class="special">(</span><span class="identifier">Args</span> <span class="special">&amp;&amp;</span><span class="special">...</span><span class="special">)</span><span class="special">;</span>
  42   <a class="link" href="child.html#idm45170605214944-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>
  43   <a class="link" href="child.html" title="Class child">child</a> <span class="special">&amp;</span> <a class="link" href="child.html#idm45170605214064-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">&amp;&amp;</span><span class="special">)</span><span class="special">;</span>
  44   <a class="link" href="child.html#idm45170605212032-bb"><span class="special">~</span><span class="identifier">child</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  45
  46   <span class="comment">// <a class="link" href="child.html#idm45170605263360-bb">private member functions</a></span>
  47   <span class="keyword">void</span> <a class="link" href="child.html#idm45170605262864-bb"><span class="identifier">detach</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  48   <span class="keyword">void</span> <a class="link" href="child.html#idm45170605261648-bb"><span class="identifier">join</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  49   <span class="keyword">bool</span> <a class="link" href="child.html#idm45170605260400-bb"><span class="identifier">joinable</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  50   <span class="identifier">native_handle_t</span> <a class="link" href="child.html#idm45170605259264-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>
  51   <span class="keyword">int</span> <a class="link" href="child.html#idm45170605257888-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>
  52   <span class="identifier">pid_t</span> <a class="link" href="child.html#idm45170605256384-bb"><span class="identifier">id</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  53   <span class="keyword">int</span> <a class="link" href="child.html#idm45170605255008-bb"><span class="identifier">native_exit_code</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  54   <span class="keyword">bool</span> <a class="link" href="child.html#idm45170605253472-bb"><span class="identifier">running</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  55   <span class="keyword">bool</span> <a class="link" href="child.html#idm45170605252336-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">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  56   <span class="keyword">void</span> <a class="link" href="child.html#idm45170605250176-bb"><span class="identifier">wait</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  57   <span class="keyword">void</span> <a class="link" href="child.html#idm45170605249040-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">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  58   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Rep<span class="special">,</span> <span class="keyword">typename</span> Period<span class="special">&gt;</span>
  59     <span class="keyword">bool</span> <a class="link" href="child.html#idm45170605246880-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">&lt;</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  60   <span class="keyword">bool</span> <a class="link" href="child.html#idm45170605243280-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">&lt;</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">,</span>
  61                 <span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  62   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Clock<span class="special">,</span> <span class="keyword">typename</span> Duration<span class="special">&gt;</span>
  63     <span class="keyword">bool</span> <a class="link" href="child.html#idm45170605240496-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">&lt;</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  64   <span class="keyword">bool</span> <a class="link" href="child.html#idm45170605236896-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">&lt;</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span> <span class="special">&gt;</span> <span class="special">&amp;</span><span class="special">,</span>
  65                   <span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  66   <span class="keyword">bool</span> <a class="link" href="child.html#idm45170605234112-bb"><span class="identifier">valid</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  67   <span class="keyword">explicit</span> <a class="link" href="child.html#idm45170605231968-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>
  68   <span class="keyword">bool</span> <a class="link" href="child.html#idm45170605230352-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>
  69   <span class="keyword">bool</span> <a class="link" href="child.html#idm45170605228896-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">&amp;</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span>
  70   <span class="keyword">void</span> <a class="link" href="child.html#idm45170605226736-bb"><span class="identifier">terminate</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  71   <span class="keyword">void</span> <a class="link" href="child.html#idm45170605223808-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">&amp;</span><span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span>
  72 <span class="special">}</span><span class="special">;</span></pre></div>
  73 <div class="refsect1">
  74 <a name="id-1.3.31.9.6.4.4"></a><h2>Description</h2>
  75 <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>
  76 <div class="note"><table border="0" summary="Note">
  77 <tr>
  78 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
  79 <th align="left">Note</th>
  80 </tr>
  81 <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>
  82 </table></div>
  83 <p>
  84 </p>
  85 <div class="refsect2">
  86 <a name="id-1.3.31.9.6.4.4.4"></a><h3>
  87 <a name="boost.process.childconstruct-copy-destruct"></a><code class="computeroutput">child</code>
  88         public
  89        construct/copy/destruct</h3>
  90 <div class="orderedlist"><ol class="orderedlist" type="1">
  91 <li class="listitem">
  92 <pre class="literallayout"><span class="keyword">explicit</span> <a name="idm45170605221520-bb"></a><span class="identifier">child</span><span class="special">(</span><span class="identifier">pid_t</span> <span class="special">&amp;</span> pid<span class="special">)</span><span class="special">;</span></pre>
  93 <p>Construct the child from a pid.</p>
  94 <div class="note"><table border="0" summary="Note">
  95 <tr>
  96 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
  97 <th align="left">Note</th>
  98 </tr>
  99 <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>
 100 </table></div>
 101 <p>
 102 </p>
 103 </li>
 104 <li class="listitem">
 105 <pre class="literallayout"><a name="idm45170605219120-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">&amp;&amp;</span> lhs<span class="special">)</span><span class="special">;</span></pre>
 106 <p>Move-Constructor. </p>
 107 </li>
 108 <li class="listitem">
 109 <pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="special">...</span> Args<span class="special">&gt;</span> <span class="keyword">explicit</span> <a name="idm45170605217600-bb"></a><span class="identifier">child</span><span class="special">(</span><span class="identifier">Args</span> <span class="special">&amp;&amp;</span><span class="special">...</span> args<span class="special">)</span><span class="special">;</span></pre>
 110 <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>
 111 </li>
 112 <li class="listitem">
 113 <pre class="literallayout"><a name="idm45170605214944-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>
 114 <p>Construct an empty child. </p>
 115 </li>
 116 <li class="listitem">
 117 <pre class="literallayout"><a class="link" href="child.html" title="Class child">child</a> <span class="special">&amp;</span> <a name="idm45170605214064-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">&amp;&amp;</span> lhs<span class="special">)</span><span class="special">;</span></pre>
 118 <p>Move assign. </p>
 119 </li>
 120 <li class="listitem">
 121 <pre class="literallayout"><a name="idm45170605212032-bb"></a><span class="special">~</span><span class="identifier">child</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
 122 <p>Destructor. </p>
 123 <div class="note"><table border="0" summary="Note">
 124 <tr>
 125 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
 126 <th align="left">Note</th>
 127 </tr>
 128 <tr><td align="left" valign="top"><p>Will call terminate (without warning) when the child was neither joined nor detached. </p></td></tr>
 129 </table></div>
 130 <p>
 131 </p>
 132 </li>
 133 </ol></div>
 134 </div>
 135 <div class="refsect2">
 136 <a name="id-1.3.31.9.6.4.4.5"></a><h3>
 137 <a name="idm45170605263360-bb"></a><code class="computeroutput">child</code> private member functions</h3>
 138 <div class="orderedlist"><ol class="orderedlist" type="1">
 139 <li class="listitem">
 140 <pre class="literallayout"><span class="keyword">void</span> <a name="idm45170605262864-bb"></a><span class="identifier">detach</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
 141 <p>Detach the child, i.e. let it run after this handle dies. </p>
 142 </li>
 143 <li class="listitem">
 144 <pre class="literallayout"><span class="keyword">void</span> <a name="idm45170605261648-bb"></a><span class="identifier">join</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
 145 <p>Join the child. This just calls wait, but that way the naming is similar to std::thread </p>
 146 </li>
 147 <li class="listitem">
 148 <pre class="literallayout"><span class="keyword">bool</span> <a name="idm45170605260400-bb"></a><span class="identifier">joinable</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
 149 <p>Check if the child is joinable. </p>
 150 </li>
 151 <li class="listitem">
 152 <pre class="literallayout"><span class="identifier">native_handle_t</span> <a name="idm45170605259264-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>
 153 <p>Get the native handle for the child process. </p>
 154 </li>
 155 <li class="listitem">
 156 <pre class="literallayout"><span class="keyword">int</span> <a name="idm45170605257888-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>
 157 <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>
 158 </li>
 159 <li class="listitem">
 160 <pre class="literallayout"><span class="identifier">pid_t</span> <a name="idm45170605256384-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>
 161 <p>Get the Process Identifier. </p>
 162 </li>
 163 <li class="listitem">
 164 <pre class="literallayout"><span class="keyword">int</span> <a name="idm45170605255008-bb"></a><span class="identifier">native_exit_code</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
 165 <p>Get the native, uninterpreted exit code. The return value is without any meaning if the child wasn't waited for or if it was terminated. </p>
 166 </li>
 167 <li class="listitem">
 168 <pre class="literallayout"><span class="keyword">bool</span> <a name="idm45170605253472-bb"></a><span class="identifier">running</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
 169 <p>Check if the child process is running. </p>
 170 </li>
 171 <li class="listitem">
 172 <pre class="literallayout"><span class="keyword">bool</span> <a name="idm45170605252336-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">&amp;</span> ec<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 173 <p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
 174 </li>
 175 <li class="listitem">
 176 <pre class="literallayout"><span class="keyword">void</span> <a name="idm45170605250176-bb"></a><span class="identifier">wait</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
 177 <p>Wait for the child process to exit. </p>
 178 </li>
 179 <li class="listitem">
 180 <pre class="literallayout"><span class="keyword">void</span> <a name="idm45170605249040-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">&amp;</span> ec<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 181 <p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
 182 </li>
 183 <li class="listitem">
 184 <pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Rep<span class="special">,</span> <span class="keyword">typename</span> Period<span class="special">&gt;</span>
 185   <span class="keyword">bool</span> <a name="idm45170605246880-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">&lt;</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span> <span class="special">&gt;</span> <span class="special">&amp;</span> rel_time<span class="special">)</span><span class="special">;</span></pre>
 186 <p>Wait for the child process to exit for a period of time.
 187 </p>
 188 <div class="variablelist"><table border="0" class="variablelist compact">
 189 <colgroup>
 190 <col align="left" valign="top">
 191 <col>
 192 </colgroup>
 193 <tbody><tr>
 194 <td><p><span class="term">Returns:</span></p></td>
 195 <td><p>True if child exited while waiting. </p></td>
 196 </tr></tbody>
 197 </table></div>
 198 </li>
 199 <li class="listitem">
 200 <pre class="literallayout"><span class="keyword">bool</span> <a name="idm45170605243280-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">&lt;</span> <span class="identifier">Rep</span><span class="special">,</span> <span class="identifier">Period</span> <span class="special">&gt;</span> <span class="special">&amp;</span> rel_time<span class="special">,</span>
 201               <span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span> ec<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 202 <p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
 203 </li>
 204 <li class="listitem">
 205 <pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Clock<span class="special">,</span> <span class="keyword">typename</span> Duration<span class="special">&gt;</span>
 206   <span class="keyword">bool</span> <a name="idm45170605240496-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">&lt;</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span> <span class="special">&gt;</span> <span class="special">&amp;</span> timeout_time<span class="special">)</span><span class="special">;</span></pre>
 207 <p>Wait for the child process to exit until a point in time.
 208 </p>
 209 <div class="variablelist"><table border="0" class="variablelist compact">
 210 <colgroup>
 211 <col align="left" valign="top">
 212 <col>
 213 </colgroup>
 214 <tbody><tr>
 215 <td><p><span class="term">Returns:</span></p></td>
 216 <td><p>True if child exited while waiting. </p></td>
 217 </tr></tbody>
 218 </table></div>
 219 </li>
 220 <li class="listitem">
 221 <pre class="literallayout"><span class="keyword">bool</span> <a name="idm45170605236896-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">&lt;</span> <span class="identifier">Clock</span><span class="special">,</span> <span class="identifier">Duration</span> <span class="special">&gt;</span> <span class="special">&amp;</span> timeout_time<span class="special">,</span>
 222                 <span class="identifier">std</span><span class="special">::</span><span class="identifier">error_code</span> <span class="special">&amp;</span> ec<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 223 <p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
 224 </li>
 225 <li class="listitem">
 226 <pre class="literallayout"><span class="keyword">bool</span> <a name="idm45170605234112-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>
 227 <p>Check if this handle holds a child process. </p>
 228 <div class="note"><table border="0" summary="Note">
 229 <tr>
 230 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../doc/src/images/note.png"></td>
 231 <th align="left">Note</th>
 232 </tr>
 233 <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>
 234 </table></div>
 235 <p>
 236 </p>
 237 </li>
 238 <li class="listitem">
 239 <pre class="literallayout"><span class="keyword">explicit</span> <a name="idm45170605231968-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>
 240 <p>Same as valid, for convenience. </p>
 241 </li>
 242 <li class="listitem">
 243 <pre class="literallayout"><span class="keyword">bool</span> <a name="idm45170605230352-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>
 244 <p>Check if the the chlid process is in any process group. </p>
 245 </li>
 246 <li class="listitem">
 247 <pre class="literallayout"><span class="keyword">bool</span> <a name="idm45170605228896-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">&amp;</span> ec<span class="special">)</span> <span class="keyword">const</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 248 <p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
 249 </li>
 250 <li class="listitem">
 251 <pre class="literallayout"><span class="keyword">void</span> <a name="idm45170605226736-bb"></a><span class="identifier">terminate</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
 252 <p>Terminate the child process.</p>
 253 <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>
 254 </li>
 255 <li class="listitem">
 256 <pre class="literallayout"><span class="keyword">void</span> <a name="idm45170605223808-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">&amp;</span> ec<span class="special">)</span> <span class="keyword">noexcept</span><span class="special">;</span></pre>
 257 <p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
 258 </li>
 259 </ol></div>
 260 </div>
 261 </div>
 262 </div>
 263 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 264 <td align="left"></td>
 265 <td align="right"><div class="copyright-footer">Copyright &#169; 2006-2012 Julio M. Merino Vidal, Ilya Sokolov,
 266       Felipe Tanus, Jeff Flinn, Boris Schaeling<br>Copyright &#169; 2016 Klemens D. Morgenstern<p>
 267         Distributed under the Boost Software License, Version 1.0. (See accompanying
 268         file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 269       </p>
 270 </div></td>
 271 </tr></table>
 272 <hr>
 273 <div class="spirit-nav">
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