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<h1>Process.hpp</h1> </div>
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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* This file is part of Raul.</span>
<a name="l00002"></a>00002 <span class="comment"> * Copyright (C) 2007-2009 David Robillard <http://drobilla.net></span>
<a name="l00003"></a>00003 <span class="comment"> *</span>
<a name="l00004"></a>00004 <span class="comment"> * Raul is free software; you can redistribute it and/or modify it under the</span>
<a name="l00005"></a>00005 <span class="comment"> * terms of the GNU General Public License as published by the Free Software</span>
<a name="l00006"></a>00006 <span class="comment"> * Foundation; either version 2 of the License, or (at your option) any later</span>
<a name="l00007"></a>00007 <span class="comment"> * version.</span>
<a name="l00008"></a>00008 <span class="comment"> *</span>
<a name="l00009"></a>00009 <span class="comment"> * Raul is distributed in the hope that it will be useful, but WITHOUT ANY</span>
<a name="l00010"></a>00010 <span class="comment"> * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS</span>
<a name="l00011"></a>00011 <span class="comment"> * FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.</span>
<a name="l00012"></a>00012 <span class="comment"> *</span>
<a name="l00013"></a>00013 <span class="comment"> * You should have received a copy of the GNU General Public License along</span>
<a name="l00014"></a>00014 <span class="comment"> * with this program; if not, write to the Free Software Foundation, Inc.,</span>
<a name="l00015"></a>00015 <span class="comment"> * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA</span>
<a name="l00016"></a>00016 <span class="comment"> */</span>
<a name="l00017"></a>00017
<a name="l00018"></a>00018 <span class="preprocessor">#ifndef RAUL_PROCESS_HPP</span>
<a name="l00019"></a>00019 <span class="preprocessor"></span><span class="preprocessor">#define RAUL_PROCESS_HPP</span>
<a name="l00020"></a>00020 <span class="preprocessor"></span>
<a name="l00021"></a>00021 <span class="preprocessor">#include <string></span>
<a name="l00022"></a>00022 <span class="preprocessor">#include <iostream></span>
<a name="l00023"></a>00023 <span class="preprocessor">#include <unistd.h></span>
<a name="l00024"></a>00024 <span class="preprocessor">#include <sys/time.h></span>
<a name="l00025"></a>00025 <span class="preprocessor">#include <sys/resource.h></span>
<a name="l00026"></a>00026 <span class="preprocessor">#include <boost/utility.hpp></span>
<a name="l00027"></a>00027 <span class="preprocessor">#include "raul/log.hpp"</span>
<a name="l00028"></a>00028
<a name="l00029"></a>00029 <span class="keyword">namespace </span>Raul {
<a name="l00030"></a>00030
<a name="l00031"></a>00031
<a name="l00036"></a><a class="code" href="classRaul_1_1Process.html">00036</a> <span class="keyword">class </span><a class="code" href="classRaul_1_1Process.html" title="A child process.">Process</a> : boost::noncopyable
<a name="l00037"></a>00037 {
<a name="l00038"></a>00038 <span class="keyword">public</span>:
<a name="l00039"></a>00039
<a name="l00044"></a><a class="code" href="classRaul_1_1Process.html#a29c0374afa11ac728940d70536a04fd6">00044</a> <span class="keyword">static</span> <span class="keywordtype">bool</span> <a class="code" href="classRaul_1_1Process.html#a29c0374afa11ac728940d70536a04fd6" title="Launch a sub process.">launch</a>(<span class="keyword">const</span> std::string& command) {
<a name="l00045"></a>00045 <span class="keyword">const</span> std::string executable = (command.find(<span class="stringliteral">" "</span>) != std::string::npos)
<a name="l00046"></a>00046 ? command.substr(0, command.find(<span class="stringliteral">" "</span>))
<a name="l00047"></a>00047 : command;
<a name="l00048"></a>00048
<a name="l00049"></a>00049 <span class="keyword">const</span> std::string arguments = command.substr((command.find(<span class="stringliteral">" "</span>) + 1));
<a name="l00050"></a>00050
<a name="l00051"></a>00051 info << <span class="stringliteral">"Launching child process '"</span> << executable << <span class="stringliteral">"' with arguments '"</span>
<a name="l00052"></a>00052 << arguments << <span class="stringliteral">"'"</span> << std::endl;
<a name="l00053"></a>00053
<a name="l00054"></a>00054 <span class="comment">// Use the same double fork() trick as JACK to prevent zombie children</span>
<a name="l00055"></a>00055 <span class="keyword">const</span> <span class="keywordtype">int</span> err = fork();
<a name="l00056"></a>00056
<a name="l00057"></a>00057 <span class="keywordflow">if</span> (err == 0) {
<a name="l00058"></a>00058 <span class="comment">// (child)</span>
<a name="l00059"></a>00059
<a name="l00060"></a>00060 <span class="comment">// close all nonstandard file descriptors</span>
<a name="l00061"></a>00061 <span class="keyword">struct </span>rlimit max_fds;
<a name="l00062"></a>00062 getrlimit(RLIMIT_NOFILE, &max_fds);
<a name="l00063"></a>00063
<a name="l00064"></a>00064 <span class="keywordflow">for</span> (rlim_t fd = 3; fd < max_fds.rlim_cur; ++fd)
<a name="l00065"></a>00065 close(fd);
<a name="l00066"></a>00066
<a name="l00067"></a>00067 <span class="keywordflow">switch</span> (fork()) {
<a name="l00068"></a>00068 <span class="keywordflow">case</span> 0:
<a name="l00069"></a>00069 <span class="comment">// (grandchild)</span>
<a name="l00070"></a>00070 setsid();
<a name="l00071"></a>00071 execlp(executable.c_str(), arguments.c_str(), NULL);
<a name="l00072"></a>00072 _exit(-1);
<a name="l00073"></a>00073
<a name="l00074"></a>00074 <span class="keywordflow">case</span> -1:
<a name="l00075"></a>00075 <span class="comment">// (second) fork failed, there is no grandchild</span>
<a name="l00076"></a>00076 _exit (-1);
<a name="l00077"></a>00077
<a name="l00078"></a>00078 <span class="comment">/* exit the child process here */</span>
<a name="l00079"></a>00079 <span class="keywordflow">default</span>:
<a name="l00080"></a>00080 _exit (0);
<a name="l00081"></a>00081 }
<a name="l00082"></a>00082 }
<a name="l00083"></a>00083
<a name="l00084"></a>00084 <span class="keywordflow">return</span> (err > 0);
<a name="l00085"></a>00085 }
<a name="l00086"></a>00086
<a name="l00087"></a>00087 <span class="keyword">private</span>:
<a name="l00088"></a>00088 <a class="code" href="classRaul_1_1Process.html" title="A child process.">Process</a>() {}
<a name="l00089"></a>00089 };
<a name="l00090"></a>00090
<a name="l00091"></a>00091
<a name="l00092"></a>00092 } <span class="comment">// namespace Raul</span>
<a name="l00093"></a>00093
<a name="l00094"></a>00094 <span class="preprocessor">#endif // RAUL_PROCESS_HPP</span>
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