Repository: mesos-site Updated Branches: refs/heads/asf-site ea255bb35 -> 454fd6564
http://git-wip-us.apache.org/repos/asf/mesos-site/blob/454fd656/content/api/latest/c++/posix_2fork_8hpp_source.html ---------------------------------------------------------------------- diff --git a/content/api/latest/c++/posix_2fork_8hpp_source.html b/content/api/latest/c++/posix_2fork_8hpp_source.html index 9e2ba55..b52b068 100644 --- a/content/api/latest/c++/posix_2fork_8hpp_source.html +++ b/content/api/latest/c++/posix_2fork_8hpp_source.html @@ -52,7 +52,7 @@ <div class="title">fork.hpp</div> </div> </div><!--header--> <div class="contents"> -<a href="posix_2fork_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Licensed under the Apache License, Version 2.0 (the "License");</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// you may not use this file except in compliance with the License.</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// You may obtain a copy of the License at</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">//</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">//</ span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// Unless required by applicable law or agreed to in writing, software</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// distributed under the License is distributed on an "AS IS" BASIS,</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">// See the License for the specific language governing permissions and</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// limitations under the License.</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> </div><div class= "line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#ifndef __STOUT_OS_POSIX_FORK_HPP__</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#define __STOUT_OS_POSIX_FORK_HPP__</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include <fcntl.h></span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include <unistd.h></span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#include <sys/mman.h></span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor" >#ifdef __FreeBSD__</span></div><div class="line"><a name="l00021"></a><span >class="lineno"> 21</span> <span class="preprocessor">#include ><sys/stat.h></span></div><div class="line"><a name="l00022"></a><span >class="lineno"> 22</span> <span class="preprocessor">#endif // >__FreeBSD__</span></div><div class="line"><a name="l00023"></a><span >class="lineno"> 23</span> <span class="preprocessor">#include ><sys/types.h></span></div><div class="line"><a name="l00024"></a><span >class="lineno"> 24</span> <span class="preprocessor">#include ><sys/wait.h></span></div><div class="line"><a name="l00025"></a><span >class="lineno"> 25</span> </div><div class="line"><a >name="l00026"></a><span class="lineno"> 26</span> <span >class="preprocessor">#include <atomic></span></div><div class="line"><a >name="l00027"></a><span class="lineno"> 27</span> <span >class="preprocessor">#include <list></span></div><div class="line"><a >name= "l00028"></a><span class="lineno"> 28</span> <span class="preprocessor">#include <memory></span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor">#include <set></span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#include <string></span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="preprocessor">#include <<a class="code" href="abort_8hpp.html">stout/abort.hpp</a>></span></div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="preprocessor">#include <<a class="code" href="stout_2include_2stout_2check_8hpp.html">stout/check.hpp</a>></span></div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="preprocessor">#incl ude <<a class="code" href="error_8hpp.html">stout/error.hpp</a>></span></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="preprocessor">#include <<a class="code" href="exit_8hpp.html">stout/exit.hpp</a>></span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="preprocessor">#include <<a class="code" href="foreach_8hpp.html">stout/foreach.hpp</a>></span></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="preprocessor">#include <<a class="code" href="strerror_8hpp.html">stout/os/strerror.hpp</a>></span></div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="preprocessor">#include <<a class="code" href="stringify_8hpp.html">stout/stringify.hpp</a>></span></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="preprocessor">#include <<a cl ass="code" href="try_8hpp.html">stout/try.hpp</a>></span></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> </div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="preprocessor">#include <<a class="code" href="close_8hpp.html">stout/os/close.hpp</a>></span></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="preprocessor">#include <<a class="code" href="ftruncate_8hpp.html">stout/os/ftruncate.hpp</a>></span></div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="preprocessor">#include <<a class="code" href="stout_2include_2stout_2os_2process_8hpp.html">stout/os/process.hpp</a>></span></div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> </div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> </div><div class="line"><a name="l00046"></a><span class=" lineno"> 46</span> <span class="comment">// Abstractions around forking process trees. You can declare a</span></div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment">// process tree "template" using 'Fork', 'Exec', and 'Wait'. For</span></div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment">// example, to describe a simple "fork/exec" you can do:</span></div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment">//</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment">// Fork f = Fork(Exec("sleep 10));</span></div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment">//</span></div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment" >// The command passed to an 'Exec' is run via 'sh -c'. You >can</span></div><div class="line"><a name="l00053"></a><span class="lineno"> > 53</span> <span class="comment">// construct more complicated templates >via nesting, for example:</span></div><div class="line"><a >name="l00054"></a><span class="lineno"> 54</span> <span >class="comment">//</span></div><div class="line"><a name="l00055"></a><span >class="lineno"> 55</span> <span class="comment">// Fork f >=</span></div><div class="line"><a name="l00056"></a><span class="lineno"> >56</span> <span class="comment">// Fork(None(),</span></div><div >class="line"><a name="l00057"></a><span class="lineno"> >57</span> <span class="comment">// Fork(Exec("echo >'grandchild 1'")),</span></div><div class="line"><a >name="l00058"></a><span class="lineno"> 58</span> <span >class="comment">// Fork(None(),</span></div><div class="line"><a >name="l00059"></a>< span class="lineno"> 59</span> <span class="comment">// Fork(Exec("echo 'great-grandchild'")),</span></div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment">// Exec("echo 'grandchild 2'"))</span></div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment">// Exec("echo 'child'"));</span></div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment">//</span></div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment">// Note that the first argument to 'Fork' here is an optional function</span></div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment">// that can be invoked before forking any more children or executing a</span></div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment">// command. THIS FUNCTION SHOULD BE ASYNC SIGNAL SAFE.</span></div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment">//</span></div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment">// To wait for children, you can use 'Wait' instead of 'Exec', for</span></div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment">// example:</span></div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment">//</span></div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment">// Fork f =</span></div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment">// Fork(None(),</span></div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment">// Fork(Exec("echo 'grandchild 1'")),</span></div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment">// Fork(Exec("echo 'grandchild 2'")),</span></div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment">// Wait());</span></div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment">//</span></div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment">// You can also omit either an 'Exec' or a 'Wait' and the forked</span></div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment">// process will just 'exit(0)'. For example, the following will cause</span></div><div class="line"><a name="l00078"></a><span class="line no"> 78</span> <span class="comment">// to processes to get reparented by 'init'.</span></div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment">//</span></div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment">// Fork f =</span></div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment">// Fork(None(),</span></div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment">// Fork(Exec("echo 'grandchild 1'")),</span></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment">// Fork(Exec("echo 'grandchild 2'")));</span></div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment">//</span></div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment">// A template can be instantiated by invoking the 'Fork' as a</span></div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment">// functor. For example, using any of the templates above we can do:</span></div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="comment">//</span></div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="comment">// Try<ProcessTree> tree = f();</span></div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="comment">//</span></div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="comment">// It's important to note that the process tree returned represents</span></div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment">// the instan t in time after the forking has completed but before</span></div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment">// 'Exec', 'Wait' or 'exit(0)' has occurred (i.e., the process tree</span></div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="comment">// will be complete).</span></div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span> </div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="keyword">namespace </span><a class="code" href="namespaceos.html">os</a> {</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span> </div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="comment">// Forward declaration.</span></div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="keyword">inline</span> <a cl ass="code" href="classResult.html">Result<Process></a> <a class="code" href="namespaceos.html#ae19e4161a51b86a1f330f3bf1dc75389">process</a>(<a class="code" href="3rdparty_2stout_2include_2stout_2windows_8hpp.html#ab03ced250ed239bc3b50b669493997f9">pid_t</a>);</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span> </div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span> </div><div class="line"><a name="l00101"></a><span class="lineno"><a class="line" href="structos_1_1Exec.html"> 101</a></span> <span class="keyword">struct </span><a class="code" href="structos_1_1Exec.html">Exec</a></div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span> {</div><div class="line"><a name="l00103"></a><span class="lineno"><a class="line" href="structos_1_1Exec.html#a863b2f013aeb3c414d3bfea56938f06c"> 103</a></span>  <a class="code" href="structos_1_1Exec.html#a863b2f013aeb3c414d3bfea56938f06c">Exec</a> (<span class="keyword">const</span> std::string& _command)</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  : <a class="code" href="structos_1_1Exec.html#ac88debff5c0fb5730df4525a62c29810">command</a>(_command) {}</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span> </div><div class="line"><a name="l00106"></a><span class="lineno"><a class="line" href="structos_1_1Exec.html#ac88debff5c0fb5730df4525a62c29810"> 106</a></span>  <span class="keyword">const</span> std::string <a class="code" href="structos_1_1Exec.html#ac88debff5c0fb5730df4525a62c29810">command</a>;</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span> };</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span> </div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span> </div><div class="line"><a name="l00110"></a><span class="lineno"><a class="line" href="structos_ 1_1Wait.html"> 110</a></span> <span class="keyword">struct </span><a class="code" href="structos_1_1Wait.html">Wait</a> {};</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span> </div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span> </div><div class="line"><a name="l00113"></a><span class="lineno"><a class="line" href="structos_1_1Fork.html"> 113</a></span> <span class="keyword">struct </span><a class="code" href="structos_1_1Fork.html">Fork</a></div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span> {</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="comment">// -+- parent.</span></div><div class="line"><a name="l00116"></a><span class="lineno"><a class="line" href="structos_1_1Fork.html#afc6b2c07aa77d5a2055d61884bc07624"> 116</a></span>  <a class="code" href="structos_1_1Fork.html#afc6b2c07aa77d5a2055d61884bc07624">Fork</a>(<span class="keyword">const</span> <a class="code" href="classOption.html">Option</a><<span class="keywordtype">void</span>(*)()>& _function,</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="keyword">const</span> <a class="code" href="structos_1_1Exec.html">Exec</a>& _exec)</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  : function(_function),</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  exec(_exec) {}</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span> </div><div class="line"><a name="l00121"></a><span class="lineno"><a class="line" href="structos_1_1Fork.html#a1cc18784c28fd959ca4080ff9f1dea42"> 121</a></span>  <a class="code" href="structos_1_1Fork.html#a1cc18784c28fd959ca4080ff9f1dea42">Fork</a>(<span class="keyword">const</span> <a class="code" href="structos_1_1Exec.html">Exec</a>& _exec) : exe c(_exec) {}</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span> </div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="comment">// -+- parent</span></div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="comment">// \--- child.</span></div><div class="line"><a name="l00125"></a><span class="lineno"><a class="line" href="structos_1_1Fork.html#a313def24689724393d38037ece4072ca"> 125</a></span>  <a class="code" href="structos_1_1Fork.html#a313def24689724393d38037ece4072ca">Fork</a>(<span class="keyword">const</span> <a class="code" href="classOption.html">Option</a><<span class="keywordtype">void</span>(*)()>& _function,</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keyword">const</span> <a class="code" href="structos_1_1Fork.html">Fork</a>& fork1)</div><div class="line"><a name="l00127"></ a><span class="lineno"> 127</span>  : function(_function)</div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  {</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <a class="code" href="namespaceos.html#a363f959e94e301ec8ec483e3c22258a6">children</a>.push_back(fork1);</div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  }</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span> </div><div class="line"><a name="l00132"></a><span class="lineno"><a class="line" href="structos_1_1Fork.html#a7e369215c6f2a7935092adb2ed3d9200"> 132</a></span>  <a class="code" href="structos_1_1Fork.html#a7e369215c6f2a7935092adb2ed3d9200">Fork</a>(<span class="keyword">const</span> <a class="code" href="classOption.html">Option</a><<span class="keywordtype">void</span>(*)()>& _function,</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</ span>  <span class="keyword">const</span> <a class="code" href="structos_1_1Fork.html">Fork</a>& fork1,</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="keyword">const</span> <a class="code" href="structos_1_1Exec.html">Exec</a>& _exec)</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  : function(_function),</div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  exec(_exec)</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  {</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <a class="code" href="namespaceos.html#a363f959e94e301ec8ec483e3c22258a6">children</a>.push_back(fork1);</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  }</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span> </div><div class="line"><a name="l00141"></a><span class="lineno"><a class="line" href="structos_1_1Fork.html#a6f83608e9fd9981b89d8945a294bd011"> 141</a></span>  <a class="code" href="structos_1_1Fork.html#a6f83608e9fd9981b89d8945a294bd011">Fork</a>(<span class="keyword">const</span> <a class="code" href="classOption.html">Option</a><<span class="keywordtype">void</span>(*)()>& _function,</div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="keyword">const</span> <a class="code" href="structos_1_1Fork.html">Fork</a>& fork1,</div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <span class="keyword">const</span> <a class="code" href="structos_1_1Wait.html">Wait</a>& _wait)</div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  : function(_function),</div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <a class="code" href="namespacepro cess.html#a07833fb41a8b0c1f18fa5485ca8c18d4">wait</a>(_wait)</div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  {</div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <a class="code" href="namespaceos.html#a363f959e94e301ec8ec483e3c22258a6">children</a>.push_back(fork1);</div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  }</div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span> </div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span> </div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="comment">// -+- parent</span></div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="comment">// |--- child</span></div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="comment">// \--- child.</span></div><div cla ss="line"><a name="l00154"></a><span class="lineno"><a class="line" href="structos_1_1Fork.html#a17a7ab7e0d5ac27ec1356841c485cf24"> 154</a></span>  <a class="code" href="structos_1_1Fork.html#a17a7ab7e0d5ac27ec1356841c485cf24">Fork</a>(<span class="keyword">const</span> <a class="code" href="classOption.html">Option</a><<span class="keywordtype">void</span>(*)()>& _function,</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  <span class="keyword">const</span> <a class="code" href="structos_1_1Fork.html">Fork</a>& fork1,</div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <span class="keyword">const</span> <a class="code" href="structos_1_1Fork.html">Fork</a>& fork2)</div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  : function(_function)</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  {</div><div class="line">< a name="l00159"></a><span class="lineno"> 159</span>  <a class="code" href="namespaceos.html#a363f959e94e301ec8ec483e3c22258a6">children</a>.push_back(fork1);</div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  <a class="code" href="namespaceos.html#a363f959e94e301ec8ec483e3c22258a6">children</a>.push_back(fork2);</div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  }</div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span> </div><div class="line"><a name="l00163"></a><span class="lineno"><a class="line" href="structos_1_1Fork.html#aa9ba5406fbb3a143b0f44ae58d4e04c6"> 163</a></span>  <a class="code" href="structos_1_1Fork.html#aa9ba5406fbb3a143b0f44ae58d4e04c6">Fork</a>(<span class="keyword">const</span> <a class="code" href="classOption.html">Option</a><<span class="keywordtype">void</span>(*)()>& _function,</div><div class="line"><a name="l00164"></a><span class="l ineno"> 164</span>  <span class="keyword">const</span> <a class="code" href="structos_1_1Fork.html">Fork</a>& fork1,</div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="keyword">const</span> <a class="code" href="structos_1_1Fork.html">Fork</a>& fork2,</div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="keyword">const</span> <a class="code" href="structos_1_1Exec.html">Exec</a>& _exec)</div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  : function(_function),</div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  exec(_exec)</div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  {</div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <a class="code" href="namespaceos.html#a363f959e94e301ec8ec483e3c22258a6">children</a>.push_back( fork1);</div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <a class="code" href="namespaceos.html#a363f959e94e301ec8ec483e3c22258a6">children</a>.push_back(fork2);</div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  }</div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span> </div><div class="line"><a name="l00174"></a><span class="lineno"><a class="line" href="structos_1_1Fork.html#a6e85142dd902a44998ab51d3f80be3e0"> 174</a></span>  <a class="code" href="structos_1_1Fork.html#a6e85142dd902a44998ab51d3f80be3e0">Fork</a>(<span class="keyword">const</span> <a class="code" href="classOption.html">Option</a><<span class="keywordtype">void</span>(*)()>& _function,</div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="keyword">const</span> <a class="code" href="structos_1_1Fork.html">Fork</a>& fork1,</div><div class="line"><a n ame="l00176"></a><span class="lineno"> 176</span>  <span class="keyword">const</span> <a class="code" href="structos_1_1Fork.html">Fork</a>& fork2,</div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  <span class="keyword">const</span> <a class="code" href="structos_1_1Wait.html">Wait</a>& _wait)</div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  : function(_function),</div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  <a class="code" href="namespaceprocess.html#a07833fb41a8b0c1f18fa5485ca8c18d4">wait</a>(_wait)</div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  {</div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <a class="code" href="namespaceos.html#a363f959e94e301ec8ec483e3c22258a6">children</a>.push_back(fork1);</div><div class="line"><a name="l00182"></a><span class="lineno"> 18 2</span>  <a class="code" href="namespaceos.html#a363f959e94e301ec8ec483e3c22258a6">children</a>.push_back(fork2);</div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  }</div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span> </div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span> </div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="comment">// -+- parent</span></div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <span class="comment">// |--- child</span></div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <span class="comment">// |--- child</span></div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  <span class="comment">// \--- child.</span></div><div class="line"><a name="l00190"></a><span class="lineno"><a class="line" href="structos_1_1F ork.html#a3f5f00f4983183549326b1ba93cc95fb"> 190</a></span>  <a class="code" href="structos_1_1Fork.html#a3f5f00f4983183549326b1ba93cc95fb">Fork</a>(<span class="keyword">const</span> <a class="code" href="classOption.html">Option</a><<span class="keywordtype">void</span>(*)()>& _function,</div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  <span class="keyword">const</span> <a class="code" href="structos_1_1Fork.html">Fork</a>& fork1,</div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  <span class="keyword">const</span> <a class="code" href="structos_1_1Fork.html">Fork</a>& fork2,</div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  <span class="keyword">const</span> <a class="code" href="structos_1_1Fork.html">Fork</a>& fork3)</div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  : function(_function)</div><d iv class="line"><a name="l00195"></a><span class="lineno"> 195</span>  {</div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  <a class="code" href="namespaceos.html#a363f959e94e301ec8ec483e3c22258a6">children</a>.push_back(fork1);</div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <a class="code" href="namespaceos.html#a363f959e94e301ec8ec483e3c22258a6">children</a>.push_back(fork2);</div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  <a class="code" href="namespaceos.html#a363f959e94e301ec8ec483e3c22258a6">children</a>.push_back(fork3);</div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  }</div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span> </div><div class="line"><a name="l00201"></a><span class="lineno"><a class="line" href="structos_1_1Fork.html#a39ce0442fe6951f0b6fb833e62f6b9e9"> 201</a></span>  <a class="code" href="structos_1_1Fork.html#a39ce0442fe6951f0b6fb833e62f6b9e9">Fork</a>(<span class="keyword">const</span> <a class="code" href="classOption.html">Option</a><<span class="keywordtype">void</span>(*)()>& _function,</div><div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <span class="keyword">const</span> <a class="code" href="structos_1_1Fork.html">Fork</a>& fork1,</div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="keyword">const</span> <a class="code" href="structos_1_1Fork.html">Fork</a>& fork2,</div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <span class="keyword">const</span> <a class="code" href="structos_1_1Fork.html">Fork</a>& fork3,</div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  <span class="keyword">const</span> <a class="code" href="structos_1_1Exec.html">Exec</a>& _e xec)</div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  : function(_function),</div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  exec(_exec)</div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  {</div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  <a class="code" href="namespaceos.html#a363f959e94e301ec8ec483e3c22258a6">children</a>.push_back(fork1);</div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <a class="code" href="namespaceos.html#a363f959e94e301ec8ec483e3c22258a6">children</a>.push_back(fork2);</div><div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <a class="code" href="namespaceos.html#a363f959e94e301ec8ec483e3c22258a6">children</a>.push_back(fork3);</div><div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  }</div><div class="line"><a name= "l00213"></a><span class="lineno"> 213</span> </div><div class="line"><a name="l00214"></a><span class="lineno"><a class="line" href="structos_1_1Fork.html#a0ea59d4f03b085dc15b571dab10e9c4a"> 214</a></span>  <a class="code" href="structos_1_1Fork.html#a0ea59d4f03b085dc15b571dab10e9c4a">Fork</a>(<span class="keyword">const</span> <a class="code" href="classOption.html">Option</a><<span class="keywordtype">void</span>(*)()>& _function,</div><div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  <span class="keyword">const</span> <a class="code" href="structos_1_1Fork.html">Fork</a>& fork1,</div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  <span class="keyword">const</span> <a class="code" href="structos_1_1Fork.html">Fork</a>& fork2,</div><div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  <span class="keyword">const</span> <a class="code" href="structo s_1_1Fork.html">Fork</a>& fork3,</div><div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  <span class="keyword">const</span> <a class="code" href="structos_1_1Wait.html">Wait</a>& _wait)</div><div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  : function(_function),</div><div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  <a class="code" href="namespaceprocess.html#a07833fb41a8b0c1f18fa5485ca8c18d4">wait</a>(_wait)</div><div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  {</div><div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  <a class="code" href="namespaceos.html#a363f959e94e301ec8ec483e3c22258a6">children</a>.push_back(fork1);</div><div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  <a class="code" href="namespaceos.html#a363f959e94e301ec8ec483e3c22258a6">children</a>.push_back(fork2);</div ><div class="line"><a name="l00224"></a><span class="lineno"> >224</span>  <a class="code" >href="namespaceos.html#a363f959e94e301ec8ec483e3c22258a6">children</a>.push_back(fork3);</div><div > class="line"><a name="l00225"></a><span class="lineno"> 225</span>  >}</div><div class="line"><a name="l00226"></a><span class="lineno"> >226</span> </div><div class="line"><a name="l00227"></a><span >class="lineno"> 227</span> <span >class="keyword">private</span>:</div><div class="line"><a >name="l00228"></a><span class="lineno"> 228</span>  <span >class="comment">// Represents the "tree" of descendants where each >node has a</span></div><div class="line"><a name="l00229"></a><span >class="lineno"> 229</span>  <span class="comment">// pointer (into >shared memory) from which we can read the</span></div><div class="line"><a >name="l00230"></a><span class="lineno"> 230</span>  <span >class="comment">// descendants process information as well as a vec tor of children.</span></div><div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  <span class="keyword">struct </span>Tree</div><div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  {</div><div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  <span class="comment">// NOTE: This struct is stored in shared memory and thus cannot</span></div><div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  <span class="comment">// hold any pointers to heap allocated memory.</span></div><div class="line"><a name="l00235"></a><span class="lineno"><a class="line" href="structos_1_1Fork_1_1Tree_1_1Memory.html"> 235</a></span>  <span class="keyword">struct </span><a class="code" href="structos_1_1Fork_1_1Tree_1_1Memory.html">Memory</a> {</div><div class="line"><a name="l00236"></a><span class="lineno"><a class="line" href="structos_1_1Fork_1_1Tree_1_1Memory.html#a2910197d41d5fcdf9822474 d79cacd59"> 236</a></span>  <a class="code" href="3rdparty_2stout_2include_2stout_2windows_8hpp.html#ab03ced250ed239bc3b50b669493997f9">pid_t</a> <a class="code" href="structos_1_1Fork_1_1Tree_1_1Memory.html#a2910197d41d5fcdf9822474d79cacd59">pid</a>;</div><div class="line"><a name="l00237"></a><span class="lineno"><a class="line" href="structos_1_1Fork_1_1Tree_1_1Memory.html#a0b729116e8198f1d46aabdc91d1a19a5"> 237</a></span>  <a class="code" href="3rdparty_2stout_2include_2stout_2windows_8hpp.html#ab03ced250ed239bc3b50b669493997f9">pid_t</a> <a class="code" href="structos_1_1Fork_1_1Tree_1_1Memory.html#a0b729116e8198f1d46aabdc91d1a19a5">parent</a>;</div><div class="line"><a name="l00238"></a><span class="lineno"><a class="line" href="structos_1_1Fork_1_1Tree_1_1Memory.html#a66aeeb78e06ae7a9156fca8fab20be8c"> 238</a></span>  <a class="code" href="3rdparty_2stout_2include_2stout_2windows_8hpp.html#ab03ced250ed239bc3b50b669493997f9">pid_t</a> <a class= "code" href="structos_1_1Fork_1_1Tree_1_1Memory.html#a66aeeb78e06ae7a9156fca8fab20be8c">group</a>;</div><div class="line"><a name="l00239"></a><span class="lineno"><a class="line" href="structos_1_1Fork_1_1Tree_1_1Memory.html#a748a18ef5738f73f5fe91c235d30fa27"> 239</a></span>  <a class="code" href="3rdparty_2stout_2include_2stout_2windows_8hpp.html#ab03ced250ed239bc3b50b669493997f9">pid_t</a> <a class="code" href="structos_1_1Fork_1_1Tree_1_1Memory.html#a748a18ef5738f73f5fe91c235d30fa27">session</a>;</div><div class="line"><a name="l00240"></a><span class="lineno"> 240</span> </div><div class="line"><a name="l00241"></a><span class="lineno"><a class="line" href="structos_1_1Fork_1_1Tree_1_1Memory.html#a6f2b0d4ecdfdf57152c17028c2ec7024"> 241</a></span>  std::atomic_bool <span class="keyword">set</span>; <span class="comment">// Has this been initialized?</span></div><div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  };</div>< div class="line"><a name="l00243"></a><span class="lineno"> 243</span> </div><div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  std::shared_ptr<Memory> <a class="code" href="namespaceos.html#a23a7b8f4b4c145ad212381e89d4b6dc4">memory</a>;</div><div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  std::vector<Tree> <a class="code" href="namespaceos.html#a363f959e94e301ec8ec483e3c22258a6">children</a>;</div><div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  };</div><div class="line"><a name="l00247"></a><span class="lineno"> 247</span> </div><div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  <span class="comment">// We use shared memory to "share" the pids of forked descendants.</span></div><div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  <span class="comment">// The benefit of shared memory over pipes is t hat each forked</span></div><div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  <span class="comment">// process can read its descendants' pids leading to a simpler</span></div><div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  <span class="comment">// implementation (with pipes, only one reader can ever read the</span></div><div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  <span class="comment">// value from the pipe, forcing much more complicated coordination).</span></div><div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  <span class="comment">//</span></div><div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  <span class="comment">// Shared memory works like a file (in memory) that gets deleted by</span></div><div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  <span class="comment">// "unlinking" it, but it won't get completely deleted until all</span></div><div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  <span class="comment">// open file descriptors referencing it have been closed. Each</span></div><div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  <span class="comment">// forked process has the shared memory mapped into it as well as an</span></div><div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  <span class="comment">// open file descriptor, both of which should get cleaned up</span></div><div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  <span class="comment">// automagically when the process exits, but we use a special</span></div><div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  <span class="comment">// "deleter" (in combination with shared_ptr) in order to clean this</span></div><div class="line"><a name=" l00261"></a><span class="lineno"> 261</span>  <span class="comment">// stuff up when we are actually finished using the shared memory.</span></div><div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  <span class="keyword">struct </span>SharedMemoryDeleter</div><div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  {</div><div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  SharedMemoryDeleter(<span class="keywordtype">int</span> _fd) : fd(_fd) {}</div><div class="line"><a name="l00265"></a><span class="lineno"> 265</span> </div><div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  <span class="keywordtype">void</span> operator()(<a class="code" href="structos_1_1Fork_1_1Tree_1_1Memory.html">Tree::Memory</a>* <a class="code" href="namespaceprocess.html">process</a>)<span class="keyword"> const</span></div><div class="line"><a name="l00267"></a><span class="lineno" > 267</span> <span class="keyword"> </span>{</div><div > class="line"><a name="l00268"></a><span class="lineno"> 268</span>  > <span class="keywordflow">if</span> (munmap(process, <span > class="keyword">sizeof</span>(<a class="code" > href="structos_1_1Fork_1_1Tree_1_1Memory.html">Tree::Memory</a>)) == -1) > {</div><div class="line"><a name="l00269"></a><span class="lineno"> > 269</span>  <a class="code" > href="abort_8hpp.html#a4d84a74fe6e4f84bc3d2f901b9e89f93">ABORT</a>(std::string(<span > class="stringliteral">"Failed to unmap memory: "</span>) + <a > class="code" > href="namespaceos.html#aa9ac22b4028f187826a9861373006abf">os::strerror</a>(errno));</div><div > class="line"><a name="l00270"></a><span class="lineno"> 270</span>  > }</div><div class="line"><a name="l00271"></a><span class="lineno"> > 271</span>  <span class="keywordflow">if</span> (::<a class="code" > href="namespaceos.html#a8df77ec6d6b8d32d9b287a41bc74cfdc">close</a>(fd) == > -1) {</div><div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  <a class="code" href="abort_8hpp.html#a4d84a74fe6e4f84bc3d2f901b9e89f93">ABORT</a>(std::string(<span class="stringliteral">"Failed to close shared memory file descriptor: "</span>) +</div><div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  <a class="code" href="namespaceos.html#aa9ac22b4028f187826a9861373006abf">os::strerror</a>(errno));</div><div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  }</div><div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  }</div><div class="line"><a name="l00276"></a><span class="lineno"> 276</span> </div><div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  <span class="keyword">const</span> <span class="keywordtype">int</span> fd;</div><div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  } ;</div><div class="line"><a name="l00279"></a><span class="lineno"> 279</span> </div><div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  <span class="comment">// Constructs a Tree (see above) from this fork template.</span></div><div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  <a class="code" href="classTry.html">Try<Tree></a> <a class="code" href="namespacecgroups.html#a4bf20862574beb5b0f9af7799489866f">prepare</a>()<span class="keyword"> const</span></div><div class="line"><a name="l00282"></a><span class="lineno"> 282</span> <span class="keyword"> </span>{</div><div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  <span class="keyword">static</span> std::atomic_int forks(0);</div><div class="line"><a name="l00284"></a><span class="lineno"> 284</span> </div><div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  <span class="comment">// Each &qu ot;instance" of an instantiated Fork needs a unique name for</span></div><div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  <span class="comment">// creating shared memory.</span></div><div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  <span class="keywordtype">int</span> instance = forks.fetch_add(1);</div><div class="line"><a name="l00288"></a><span class="lineno"> 288</span> </div><div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  std::string <a class="code" href="namespaceos_1_1Shell.html#acfe16ef2b1146ad49a8651c0a457ce46">name</a> =</div><div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  <span class="stringliteral">"/stout-forks-"</span> + <a class="code" href="namespacens.html#a28116b46e6543597a11733424cd1aa20">stringify</a>(getpid()) + <a class="code" href="namespacens.html#a28116b46e6543597a11733424cd1aa20">stringify</a>(instance) ;</div><div class="line"><a name="l00291"></a><span class="lineno"> 291</span> </div><div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  <span class="keywordtype">int</span> fd = shm_open(name.c_str(), O_CREAT | O_RDWR, <a class="code" href="3rdparty_2stout_2include_2stout_2windows_8hpp.html#a66cff14a0638cde9f422c7a4b0938e61">S_IRUSR</a> | <a class="code" href="3rdparty_2stout_2include_2stout_2windows_8hpp.html#aead39710af2622ee9b0d412f62e90aa5">S_IWUSR</a>);</div><div class="line"><a name="l00293"></a><span class="lineno"> 293</span> </div><div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  <span class="keywordflow">if</span> (fd == -1) {</div><div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  <span class="keywordflow">return</span> <a class="code" href="classErrnoError.html">ErrnoError</a>(<span class="stringliteral">"Failed to open a shared memory object"</span>);</d iv><div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  }</div><div class="line"><a name="l00297"></a><span class="lineno"> 297</span> </div><div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  <a class="code" href="classTry.html">Try<Nothing></a> truncated = <a class="code" href="namespaceos.html#af41b169df092f5afbd41de13c450e959">ftruncate</a>(fd, <span class="keyword">sizeof</span>(<a class="code" href="structos_1_1Fork_1_1Tree_1_1Memory.html">Tree::Memory</a>));</div><div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  <span class="keywordflow">if</span> (truncated.<a class="code" href="classTry.html#a0b98f95163b8a38daafd1651b043a276">isError</a>()) {</div><div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  <span class="keywordflow">return</span> <a class="code" href="classError.html">Error</a>(</div><div class="line"><a name="l00301"></a><span class ="lineno"> 301</span>  <span class="stringliteral">"Failed to set size of shared memory object: "</span> + truncated.<a class="code" href="classTry.html#aec4a11ddd3c036e889d90b7eb6258ba7">error</a>());</div><div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  }</div><div class="line"><a name="l00303"></a><span class="lineno"> 303</span> </div><div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  <span class="keywordtype">void</span>* <a class="code" href="namespaceos.html#a23a7b8f4b4c145ad212381e89d4b6dc4">memory</a> = mmap(</div><div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  <span class="keyword">nullptr</span>,</div><div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  <span class="keyword">sizeof</span>(<a class="code" href="structos_1_1Fork_1_1Tree_1_1Memory.html">Tree::Memory</a>),</div><div class="line"><a name="l00307"> </a><span class="lineno"> 307</span>  PROT_READ | PROT_WRITE, MAP_SHARED,</div><div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  fd,</div><div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  0);</div><div class="line"><a name="l00310"></a><span class="lineno"> 310</span> </div><div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  <span class="keywordflow">if</span> (memory == MAP_FAILED) {</div><div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  <span class="keywordflow">return</span> <a class="code" href="classErrnoError.html">ErrnoError</a>(<span class="stringliteral">"Failed to map shared memory object"</span>);</div><div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  }</div><div class="line"><a name="l00314"></a><span class="lineno"> 314</span> </div><div class="line"><a name="l00315"></a ><span class="lineno"> 315</span>  <span >class="keywordflow">if</span> (shm_unlink(name.c_str()) == -1) {</div><div >class="line"><a name="l00316"></a><span class="lineno"> 316</span>  > <span class="keywordflow">return</span> <a class="code" >href="classErrnoError.html">ErrnoError</a>(<span >class="stringliteral">"Failed to unlink shared memory >object"</span>);</div><div class="line"><a name="l00317"></a><span >class="lineno"> 317</span>  }</div><div class="line"><a >name="l00318"></a><span class="lineno"> 318</span> </div><div >class="line"><a name="l00319"></a><span class="lineno"> 319</span>  >SharedMemoryDeleter deleter(fd);</div><div class="line"><a >name="l00320"></a><span class="lineno"> 320</span> </div><div >class="line"><a name="l00321"></a><span class="lineno"> 321</span>  >Tree tree;</div><div class="line"><a name="l00322"></a><span class="lineno"> >322</span>  tree.memory = std::shared_ptr<Tree::Memory >((<a class="code" href="structos_1_1Fork_1_1Tree_1_1Memory.html">Tree::Memory</a>*)memory, deleter);</div><div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  tree.memory->set.store(<span class="keyword">false</span>);</div><div class="line"><a name="l00324"></a><span class="lineno"> 324</span> </div><div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < <a class="code" href="namespaceos.html#a363f959e94e301ec8ec483e3c22258a6">children</a>.size(); i++) {</div><div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  <a class="code" href="classTry.html">Try<Tree></a> tree_ = <a class="code" href="namespaceos.html#a363f959e94e301ec8ec483e3c22258a6">children</a>[i].prepare();</div><div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  <span class="keywordflow">if</spa n> (tree_.<a class="code" href="classTry.html#a0b98f95163b8a38daafd1651b043a276">isError</a>()) {</div><div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  <span class="keywordflow">return</span> <a class="code" href="classError.html">Error</a>(tree_.<a class="code" href="classTry.html#aec4a11ddd3c036e889d90b7eb6258ba7">error</a>());</div><div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  }</div><div class="line"><a name="l00330"></a><span class="lineno"> 330</span>  tree.children.push_back(tree_.<a class="code" href="classTry.html#a8bc7f43e75a47111ea18e9c83b007be5">get</a>());</div><div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  }</div><div class="line"><a name="l00332"></a><span class="lineno"> 332</span> </div><div class="line"><a name="l00333"></a><span class="lineno"> 333</span>  <span class="keywordflow">return</span> tree;</div><div class="line"><a nam e="l00334"></a><span class="lineno"> 334</span>  }</div><div class="line"><a name="l00335"></a><span class="lineno"> 335</span> </div><div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  <span class="comment">// Performs the fork, executes the function, recursively</span></div><div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  <span class="comment">// instantiates any children, and then executes/waits/exits.</span></div><div class="line"><a name="l00338"></a><span class="lineno"> 338</span>  <a class="code" href="3rdparty_2stout_2include_2stout_2windows_8hpp.html#ab03ced250ed239bc3b50b669493997f9">pid_t</a> instantiate(<span class="keyword">const</span> Tree& tree)<span class="keyword"> const</span></div><div class="line"><a name="l00339"></a><span class="lineno"> 339</span> <span class="keyword"> </span>{</div><div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  <a cl ass="code" href="3rdparty_2stout_2include_2stout_2windows_8hpp.html#ab03ced250ed239bc3b50b669493997f9">pid_t</a> pid = ::fork();</div><div class="line"><a name="l00341"></a><span class="lineno"> 341</span>  <span class="keywordflow">if</span> (pid > 0) {</div><div class="line"><a name="l00342"></a><span class="lineno"> 342</span>  <span class="keywordflow">return</span> pid;</div><div class="line"><a name="l00343"></a><span class="lineno"> 343</span>  }</div><div class="line"><a name="l00344"></a><span class="lineno"> 344</span> </div><div class="line"><a name="l00345"></a><span class="lineno"> 345</span>  <span class="comment">// Set the basic process information.</span></div><div class="line"><a name="l00346"></a><span class="lineno"> 346</span>  <a class="code" href="structos_1_1Fork_1_1Tree_1_1Memory.html">Tree::Memory</a> <a class="code" href="namespaceos.html#ae19e4161a51b86a1f330f3bf1dc75389">process</a>;</div><div class ="line"><a name="l00347"></a><span class="lineno"> 347</span>  process.<a class="code" href="structos_1_1Fork_1_1Tree_1_1Memory.html#a2910197d41d5fcdf9822474d79cacd59">pid</a> = getpid();</div><div class="line"><a name="l00348"></a><span class="lineno"> 348</span>  process.<a class="code" href="structos_1_1Fork_1_1Tree_1_1Memory.html#a0b729116e8198f1d46aabdc91d1a19a5">parent</a> = getppid();</div><div class="line"><a name="l00349"></a><span class="lineno"> 349</span>  process.<a class="code" href="structos_1_1Fork_1_1Tree_1_1Memory.html#a66aeeb78e06ae7a9156fca8fab20be8c">group</a> = getpgid(0);</div><div class="line"><a name="l00350"></a><span class="lineno"> 350</span>  process.<a class="code" href="structos_1_1Fork_1_1Tree_1_1Memory.html#a748a18ef5738f73f5fe91c235d30fa27">session</a> = getsid(0);</div><div class="line"><a name="l00351"></a><span class="lineno"> 351</span>  process.<a class="code" href="structos_1_1Fork_1_1Tree_1_1Memory .html#a6f2b0d4ecdfdf57152c17028c2ec7024">set</a>.store(<span class="keyword">true</span>);</div><div class="line"><a name="l00352"></a><span class="lineno"> 352</span> </div><div class="line"><a name="l00353"></a><span class="lineno"> 353</span>  <span class="comment">// Copy it into shared memory.</span></div><div class="line"><a name="l00354"></a><span class="lineno"> 354</span>  memcpy(tree.memory.get(), &<a class="code" href="namespaceos.html#ae19e4161a51b86a1f330f3bf1dc75389">process</a>, <span class="keyword">sizeof</span>(<a class="code" href="structos_1_1Fork_1_1Tree_1_1Memory.html">Tree::Memory</a>));</div><div class="line"><a name="l00355"></a><span class="lineno"> 355</span> </div><div class="line"><a name="l00356"></a><span class="lineno"> 356</span>  <span class="comment">// Execute the function, if any.</span></div><div class="line"><a name="l00357"></a><span class="lineno"> 357</span>  <span class="keywordflow">if</s pan> (<span class="keyword">function</span>.isSome()) {</div><div class="line"><a name="l00358"></a><span class="lineno"> 358</span>  <span class="keyword">function</span>.get()();</div><div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  }</div><div class="line"><a name="l00360"></a><span class="lineno"> 360</span> </div><div class="line"><a name="l00361"></a><span class="lineno"> 361</span>  <span class="comment">// Fork the children, if any.</span></div><div class="line"><a name="l00362"></a><span class="lineno"> 362</span>  CHECK(<a class="code" href="namespaceos.html#a363f959e94e301ec8ec483e3c22258a6">children</a>.size() == tree.children.size());</div><div class="line"><a name="l00363"></a><span class="lineno"> 363</span>  std::set<pid_t> <a class="code" href="namespaceos.html#a42af1cab63434cedf2b698cd6f49f073">pids</a>;</div><div class="line"><a name="l00364"></a><span class="lineno"> 364</span> 60; <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < <a class="code" href="namespaceos.html#a363f959e94e301ec8ec483e3c22258a6">children</a>.size(); i++) {</div><div class="line"><a name="l00365"></a><span class="lineno"> 365</span>  pids.insert(<a class="code" href="namespaceos.html#a363f959e94e301ec8ec483e3c22258a6">children</a>[i].instantiate(tree.children[i]));</div><div class="line"><a name="l00366"></a><span class="lineno"> 366</span>  }</div><div class="line"><a name="l00367"></a><span class="lineno"> 367</span> </div><div class="line"><a name="l00368"></a><span class="lineno"> 368</span>  <span class="comment">// Execute or wait.</span></div><div class="line"><a name="l00369"></a><span class="lineno"> 369</span>  <span class="keywordflow">if</span> (exec.isSome()) {</div><div class="line"><a name="l00370"></a><span class="lineno"> 370</span>  <span class="comment">// Execute t he command (via '/bin/sh -c command').</span></div><div class="line"><a name="l00371"></a><span class="lineno"> 371</span>  <span class="keyword">const</span> <span class="keywordtype">char</span>* <a class="code" href="structos_1_1Exec.html#ac88debff5c0fb5730df4525a62c29810">command</a> = exec->command.c_str();</div><div class="line"><a name="l00372"></a><span class="lineno"> 372</span>  <a class="code" href="namespaceos.html#a4b727e301623549c37cdfcd8c553a2c7">execlp</a>(<span class="stringliteral">"sh"</span>, <span class="stringliteral">"sh"</span>, <span class="stringliteral">"-c"</span>, command, (<span class="keywordtype">char</span>*) <span class="keyword">nullptr</span>);</div><div class="line"><a name="l00373"></a><span class="lineno"> 373</span>  <a class="code" href="exit_8hpp.html#a536432347f1ad965e8116c2940fbf110">EXIT</a>(EXIT_FAILURE)</div><div class="line"><a name="l00374"></a><span class="line no"> 374</span>  << <span class="stringliteral">"Failed to execute '"</span> << command << <span class="stringliteral">"': "</span> << <a class="code" href="namespaceos.html#aa9ac22b4028f187826a9861373006abf">os::strerror</a>(errno);</div><div class="line"><a name="l00375"></a><span class="lineno"> 375</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (<a class="code" href="namespaceprocess.html#a07833fb41a8b0c1f18fa5485ca8c18d4">wait</a>.isSome()) {</div><div class="line"><a name="l00376"></a><span class="lineno"> 376</span>  <span class="keywordflow">foreach</span> (<a class="code" href="3rdparty_2stout_2include_2stout_2windows_8hpp.html#ab03ced250ed239bc3b50b669493997f9">pid_t</a> pid, pids) {</div><div class="line"><a name="l00377"></a><span class="lineno"> 377</span>  <span class="comment">// TODO(benh): Check for signal interruption or other error s.</span></div><div class="line"><a name="l00378"></a><span class="lineno"> 378</span>  <a class="code" href="namespaceos.html#a48c86262928f59c5c54d0cb0012e2aba">waitpid</a>(pid, <span class="keyword">nullptr</span>, 0);</div><div class="line"><a name="l00379"></a><span class="lineno"> 379</span>  }</div><div class="line"><a name="l00380"></a><span class="lineno"> 380</span>  }</div><div class="line"><a name="l00381"></a><span class="lineno"> 381</span> </div><div class="line"><a name="l00382"></a><span class="lineno"> 382</span>  exit(0);</div><div class="line"><a name="l00383"></a><span class="lineno"> 383</span>  <span class="keywordflow">return</span> -1;</div><div class="line"><a name="l00384"></a><span class="lineno"> 384</span>  }</div><div class="line"><a name="l00385"></a><span class="lineno"> 385</span> </div><div class="line"><a name="l00386"></a><span class="lineno"> 386</span>  <span class="com ment">// Waits for all of the descendant processes in the tree to update</span></div><div class="line"><a name="l00387"></a><span class="lineno"> 387</span>  <span class="comment">// their pids and constructs a ProcessTree using the Tree::Memory</span></div><div class="line"><a name="l00388"></a><span class="lineno"> 388</span>  <span class="comment">// information from shared memory.</span></div><div class="line"><a name="l00389"></a><span class="lineno"> 389</span>  <span class="keyword">static</span> <a class="code" href="classTry.html">Try<ProcessTree></a> coordinate(<span class="keyword">const</span> Tree& tree)</div><div class="line"><a name="l00390"></a><span class="lineno"> 390</span>  {</div><div class="line"><a name="l00391"></a><span class="lineno"> 391</span>  <span class="comment">// Wait for the forked process.</span></div><div class="line"><a name="l00392"></a><span class="lineno"> 392</span>  <span class="commen t">// TODO(benh): Don't wait forever?</span></div><div class="line"><a name="l00393"></a><span class="lineno"> 393</span>  <span class="keywordflow">while</span> (!tree.memory->set.load());</div><div class="line"><a name="l00394"></a><span class="lineno"> 394</span> </div><div class="line"><a name="l00395"></a><span class="lineno"> 395</span>  <span class="comment">// All processes in the returned ProcessTree will have the</span></div><div class="line"><a name="l00396"></a><span class="lineno"> 396</span>  <span class="comment">// command-line of the top level process, since we construct the</span></div><div class="line"><a name="l00397"></a><span class="lineno"> 397</span>  <span class="comment">// tree using post-fork pre-exec information. So, we'll grab the</span></div><div class="line"><a name="l00398"></a><span class="lineno"> 398</span>  <span class="comment">// command of the current process here.</span></div><div class="line"><a name="l00399"></a><span class="lineno"> 399</span>  <a class="code" href="classResult.html">Result<Process></a> <span class="keyword">self</span> = <a class="code" href="namespaceos.html#ae19e4161a51b86a1f330f3bf1dc75389">os::process</a>(getpid());</div><div class="line"><a name="l00400"></a><span class="lineno"> 400</span> </div><div class="line"><a name="l00401"></a><span class="lineno"> 401</span>  <a class="code" href="structos_1_1Process.html">Process</a> <a class="code" href="namespaceprocess.html">process</a> = <a class="code" href="structos_1_1Process.html">Process</a>(</div><div class="line"><a name="l00402"></a><span class="lineno"> 402</span>  tree.memory->pid,</div><div class="line"><a name="l00403"></a><span class="lineno"> 403</span>  tree.memory->parent,</div><div class="line"><a name="l00404"></a><span class="lineno"> 404</span>  tree.memory->group,</div><div class="line"><a name="l00405"></a><span class="lineno"> 405</span>  tree.memory->session,</div><div class="line"><a name="l00406"></a><span class="lineno"> 406</span>  <a class="code" href="structNone.html">None</a>(),</div><div class="line"><a name="l00407"></a><span class="lineno"> 407</span>  <a class="code" href="structNone.html">None</a>(),</div><div class="line"><a name="l00408"></a><span class="lineno"> 408</span>  <a class="code" href="structNone.html">None</a>(),</div><div class="line"><a name="l00409"></a><span class="lineno"> 409</span>  <span class="keyword">self</span>.isSome() ? self->command : <span class="stringliteral">""</span>,</div><div class="line"><a name="l00410"></a><span class="lineno"> 410</span>  <span class="keyword">false</span>);</div><div class="line"><a name="l00411"></a><span class="lineno"> 411</span> </div><div class="line"><a name="l00412"></a><span class="lineno" > 412</span>  std::list<ProcessTree> <a class="code" > href="namespaceos.html#a363f959e94e301ec8ec483e3c22258a6">children</a>;</div><div > class="line"><a name="l00413"></a><span class="lineno"> 413</span>  > <span class="keywordflow">for</span> (<span > class="keywordtype">size_t</span> i = 0; i < tree.children.size(); i++) > {</div><div class="line"><a name="l00414"></a><span class="lineno"> > 414</span>  <a class="code" > href="classTry.html">Try<ProcessTree></a> child = > coordinate(tree.children[i]);</div><div class="line"><a > name="l00415"></a><span class="lineno"> 415</span>  <span > class="keywordflow">if</span> (child.<a class="code" > href="classTry.html#a0b98f95163b8a38daafd1651b043a276">isError</a>()) > {</div><div class="line"><a name="l00416"></a><span class="lineno"> > 416</span>  <span class="keywordflow">return</span> <a > class="code" href="classError.html">Error</a>(child.<a class="code" > href="classTry.html#aec4a11ddd3c036e 889d90b7eb6258ba7">error</a>());</div><div class="line"><a name="l00417"></a><span class="lineno"> 417</span>  }</div><div class="line"><a name="l00418"></a><span class="lineno"> 418</span>  children.push_back(child.<a class="code" href="classTry.html#a8bc7f43e75a47111ea18e9c83b007be5">get</a>());</div><div class="line"><a name="l00419"></a><span class="lineno"> 419</span>  }</div><div class="line"><a name="l00420"></a><span class="lineno"> 420</span> </div><div class="line"><a name="l00421"></a><span class="lineno"> 421</span>  <span class="keywordflow">return</span> <a class="code" href="classos_1_1ProcessTree.html">ProcessTree</a>(process, children);</div><div class="line"><a name="l00422"></a><span class="lineno"> 422</span>  }</div><div class="line"><a name="l00423"></a><span class="lineno"> 423</span> </div><div class="line"><a name="l00424"></a><span class="lineno"> 424</span> <span class="keyword">public</span> :</div><div class="line"><a name="l00425"></a><span class="lineno"> 425</span>  <span class="comment">// Prepares and instantiates the process tree.</span></div><div class="line"><a name="l00426"></a><span class="lineno"><a class="line" href="structos_1_1Fork.html#a02efce3a3ea84a623858bbff4ed03b0c"> 426</a></span>  <a class="code" href="classTry.html">Try<ProcessTree></a> <a class="code" href="structos_1_1Fork.html#a02efce3a3ea84a623858bbff4ed03b0c">operator()</a>()<span class="keyword"> const</span></div><div class="line"><a name="l00427"></a><span class="lineno"> 427</span> <span class="keyword"> </span>{</div><div class="line"><a name="l00428"></a><span class="lineno"> 428</span>  <a class="code" href="classTry.html">Try<Tree></a> tree = <a class="code" href="namespacecgroups.html#a4bf20862574beb5b0f9af7799489866f">prepare</a>();</div><div class="line"><a name="l00429"></a><span class="lineno"> 429</span> </div><div class="line"><a name="l00430"></a><span class="lineno"> 430</span>  <span class="keywordflow">if</span> (tree.<a class="code" href="classTry.html#a0b98f95163b8a38daafd1651b043a276">isError</a>()) {</div><div class="line"><a name="l00431"></a><span class="lineno"> 431</span>  <span class="keywordflow">return</span> <a class="code" href="classError.html">Error</a>(tree.<a class="code" href="classTry.html#aec4a11ddd3c036e889d90b7eb6258ba7">error</a>());</div><div class="line"><a name="l00432"></a><span class="lineno"> 432</span>  }</div><div class="line"><a name="l00433"></a><span class="lineno"> 433</span> </div><div class="line"><a name="l00434"></a><span class="lineno"> 434</span>  <a class="code" href="classTry.html">Try<pid_t></a> pid = instantiate(tree.<a class="code" href="classTry.html#a8bc7f43e75a47111ea18e9c83b007be5">get</a>());</div><div class="line"><a name="l00435"></a><span class="lineno"> 435</span> </div><div class="line"><a name ="l00436"></a><span class="lineno"> 436</span>  <span class="keywordflow">if</span> (pid.isError()) {</div><div class="line"><a name="l00437"></a><span class="lineno"> 437</span>  <span class="keywordflow">return</span> <a class="code" href="classError.html">Error</a>(pid.error());</div><div class="line"><a name="l00438"></a><span class="lineno"> 438</span>  }</div><div class="line"><a name="l00439"></a><span class="lineno"> 439</span> </div><div class="line"><a name="l00440"></a><span class="lineno"> 440</span>  <span class="keywordflow">return</span> coordinate(tree.<a class="code" href="classTry.html#a8bc7f43e75a47111ea18e9c83b007be5">get</a>());</div><div class="line"><a name="l00441"></a><span class="lineno"> 441</span>  }</div><div class="line"><a name="l00442"></a><span class="lineno"> 442</span> </div><div class="line"><a name="l00443"></a><span class="lineno"> 443</span> <span class="keyword">private</span>:</di v><div class="line"><a name="l00444"></a><span class="lineno"> 444</span>  <a class="code" href="classOption.html">Option<void(*)()></a> <span class="keyword">function</span>;</div><div class="line"><a name="l00445"></a><span class="lineno"> 445</span>  <a class="code" href="classOption.html">Option<const Exec></a> exec;</div><div class="line"><a name="l00446"></a><span class="lineno"> 446</span>  <a class="code" href="classOption.html">Option<const Wait></a> <a class="code" href="namespaceprocess.html#a07833fb41a8b0c1f18fa5485ca8c18d4">wait</a>;</div><div class="line"><a name="l00447"></a><span class="lineno"> 447</span>  std::vector<Fork> <a class="code" href="namespaceos.html#a363f959e94e301ec8ec483e3c22258a6">children</a>;</div><div class="line"><a name="l00448"></a><span class="lineno"> 448</span> };</div><div class="line"><a name="l00449"></a><span class="lineno"> 449</span> </div><div class="line"><a name="l00450 "></a><span class="lineno"> 450</span> } <span class="comment">// namespace os {</span></div><div class="line"><a name="l00451"></a><span class="lineno"> 451</span> </div><div class="line"><a name="l00452"></a><span class="lineno"> 452</span> <span class="preprocessor">#endif // __STOUT_OS_POSIX_FORK_HPP__</span></div><div class="ttc" id="ftruncate_8hpp_html"><div class="ttname"><a href="ftruncate_8hpp.html">ftruncate.hpp</a></div></div> +<a href="posix_2fork_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Licensed under the Apache License, Version 2.0 (the "License");</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// you may not use this file except in compliance with the License.</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// You may obtain a copy of the License at</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">//</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">//</ span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// Unless required by applicable law or agreed to in writing, software</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// distributed under the License is distributed on an "AS IS" BASIS,</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">// See the License for the specific language governing permissions and</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// limitations under the License.</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> </div><div class= "line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#ifndef __STOUT_OS_POSIX_FORK_HPP__</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#define __STOUT_OS_POSIX_FORK_HPP__</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include <fcntl.h></span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include <unistd.h></span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> </div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#include <sys/mman.h></span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor" >#ifdef __FreeBSD__</span></div><div class="line"><a name="l00021"></a><span >class="lineno"> 21</span> <span class="preprocessor">#include ><sys/stat.h></span></div><div class="line"><a name="l00022"></a><span >class="lineno"> 22</span> <span class="preprocessor">#endif // >__FreeBSD__</span></div><div class="line"><a name="l00023"></a><span >class="lineno"> 23</span> <span class="preprocessor">#include ><sys/types.h></span></div><div class="line"><a name="l00024"></a><span >class="lineno"> 24</span> <span class="preprocessor">#include ><sys/wait.h></span></div><div class="line"><a name="l00025"></a><span >class="lineno"> 25</span> </div><div class="line"><a >name="l00026"></a><span class="lineno"> 26</span> <span >class="preprocessor">#include <atomic></span></div><div class="line"><a >name="l00027"></a><span class="lineno"> 27</span> <span >class="preprocessor">#include <list></span></div><div class="line"><a >name= "l00028"></a><span class="lineno"> 28</span> <span class="preprocessor">#include <memory></span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor">#include <set></span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#include <string></span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="preprocessor">#include <<a class="code" href="abort_8hpp.html">stout/abort.hpp</a>></span></div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="preprocessor">#include <<a class="code" href="stout_2include_2stout_2check_8hpp.html">stout/check.hpp</a>></span></div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="preprocessor">#incl ude <<a class="code" href="error_8hpp.html">stout/error.hpp</a>></span></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="preprocessor">#include <<a class="code" href="exit_8hpp.html">stout/exit.hpp</a>></span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="preprocessor">#include <<a class="code" href="foreach_8hpp.html">stout/foreach.hpp</a>></span></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="preprocessor">#include <<a class="code" href="strerror_8hpp.html">stout/os/strerror.hpp</a>></span></div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="preprocessor">#include <<a class="code" href="stringify_8hpp.html">stout/stringify.hpp</a>></span></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="preprocessor">#include <<a cl ass="code" href="try_8hpp.html">stout/try.hpp</a>></span></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> </div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="preprocessor">#include <<a class="code" href="close_8hpp.html">stout/os/close.hpp</a>></span></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="preprocessor">#include <<a class="code" href="ftruncate_8hpp.html">stout/os/ftruncate.hpp</a>></span></div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="preprocessor">#include <<a class="code" href="stout_2include_2stout_2os_2process_8hpp.html">stout/os/process.hpp</a>></span></div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> </div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> </div><div class="line"><a name="l00046"></a><span class=" lineno"> 46</span> <span class="comment">// Abstractions around forking process trees. You can declare a</span></div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment">// process tree "template" using 'Fork', 'Exec', and 'Wait'. For</span></div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment">// example, to describe a simple "fork/exec" you can do:</span></div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment">//</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment">// Fork f = Fork(Exec("sleep 10));</span></div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment">//</span></div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment" >// The command passed to an 'Exec' is run via 'sh -c'. You >can</span></div><div class="line"><a name="l00053"></a><span class="lineno"> > 53</span> <span class="comment">// construct more complicated templates >via nesting, for example:</span></div><div class="line"><a >name="l00054"></a><span class="lineno"> 54</span> <span >class="comment">//</span></div><div class="line"><a name="l00055"></a><span >class="lineno"> 55</span> <span class="comment">// Fork f >=</span></div><div class="line"><a name="l00056"></a><span class="lineno"> >56</span> <span class="comment">// Fork(None(),</span></div><div >class="line"><a name="l00057"></a><span class="lineno"> >57</span> <span class="comment">// Fork(Exec("echo >'grandchild 1'")),</span></div><div class="line"><a >name="l00058"></a><span class="lineno"> 58</span> <span >class="comment">// Fork(None(),</span></div><div class="line"><a >name="l00059"></a>< span class="lineno"> 59</span> <span class="comment">// Fork(Exec("echo 'great-grandchild'")),</span></div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment">// Exec("echo 'grandchild 2'"))</span></div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment">// Exec("echo 'child'"));</span></div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment">//</span></div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment">// Note that the first argument to 'Fork' here is an optional function</span></div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment">// that can be invoked before forking any more children or executing a</span></div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment">// command. THIS FUNCTION SHOULD BE ASYNC SIGNAL SAFE.</span></div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment">//</span></div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment">// To wait for children, you can use 'Wait' instead of 'Exec', for</span></div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment">// example:</span></div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment">//</span></div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment">// Fork f =</span></div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment">// Fork(None(),</span></div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment">// Fork(Exec("echo 'grandchild 1'")),</span></div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment">// Fork(Exec("echo 'grandchild 2'")),</span></div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment">// Wait());</span></div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment">//</span></div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment">// You can also omit either an 'Exec' or a 'Wait' and the forked</span></div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment">// process will just 'exit(0)'. For example, the following will cause</span></div><div class="line"><a name="l00078"></a><span class="line no"> 78</span> <span class="comment">// to processes to get reparented by 'init'.</span></div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment">//</span></div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment">// Fork f =</span></div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment">// Fork(None(),</span></div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment">// Fork(Exec("echo 'grandchild 1'")),</span></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment">// Fork(Exec("echo 'grandchild 2'")));</span></div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment">//</span></div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment">// A template can be instantiated by invoking the 'Fork' as a</span></div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment">// functor. For example, using any of the templates above we can do:</span></div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="comment">//</span></div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="comment">// Try<ProcessTree> tree = f();</span></div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="comment">//</span></div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="comment">// It's important to note that the process tree returned represents</span></div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment">// the instan t in time after the forking has completed but before</span></div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment">// 'Exec', 'Wait' or 'exit(0)' has occurred (i.e., the process tree</span></div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="comment">// will be complete).</span></div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span> </div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="keyword">namespace </span><a class="code" href="namespaceos.html">os</a> {</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&# <TRUNCATED>
