RAUL
0.8.0
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00001 /* This file is part of Raul. 00002 * Copyright (C) 2007-2009 David Robillard <http://drobilla.net> 00003 * 00004 * Raul is free software; you can redistribute it and/or modify it under the 00005 * terms of the GNU General Public License as published by the Free Software 00006 * Foundation; either version 2 of the License, or (at your option) any later 00007 * version. 00008 * 00009 * Raul is distributed in the hope that it will be useful, but WITHOUT ANY 00010 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 00011 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for details. 00012 * 00013 * You should have received a copy of the GNU General Public License along 00014 * with this program; if not, write to the Free Software Foundation, Inc., 00015 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 00016 */ 00017 00018 #ifndef RAUL_PROCESS_HPP 00019 #define RAUL_PROCESS_HPP 00020 00021 #include <sys/resource.h> 00022 #include <sys/time.h> 00023 #include <unistd.h> 00024 00025 #include <iostream> 00026 #include <string> 00027 00028 #include <boost/utility.hpp> 00029 00030 #include "raul/log.hpp" 00031 00032 namespace Raul { 00033 00034 00039 class Process : boost::noncopyable 00040 { 00041 public: 00042 00047 static bool launch(const std::string& command) { 00048 const std::string executable = (command.find(" ") != std::string::npos) 00049 ? command.substr(0, command.find(" ")) 00050 : command; 00051 00052 const std::string arguments = command.substr((command.find(" ") + 1)); 00053 00054 info << "Launching child process '" << executable << "' with arguments '" 00055 << arguments << "'" << std::endl; 00056 00057 // Use the same double fork() trick as JACK to prevent zombie children 00058 const int err = fork(); 00059 00060 if (err == 0) { 00061 // (child) 00062 00063 // close all nonstandard file descriptors 00064 struct rlimit max_fds; 00065 getrlimit(RLIMIT_NOFILE, &max_fds); 00066 00067 for (rlim_t fd = 3; fd < max_fds.rlim_cur; ++fd) 00068 close(fd); 00069 00070 switch (fork()) { 00071 case 0: 00072 // (grandchild) 00073 setsid(); 00074 execlp(executable.c_str(), arguments.c_str(), NULL); 00075 _exit(-1); 00076 00077 case -1: 00078 // (second) fork failed, there is no grandchild 00079 _exit (-1); 00080 00081 /* exit the child process here */ 00082 default: 00083 _exit (0); 00084 } 00085 } 00086 00087 return (err > 0); 00088 } 00089 00090 private: 00091 Process() {} 00092 }; 00093 00094 00095 } // namespace Raul 00096 00097 #endif // RAUL_PROCESS_HPP