RAUL 0.7.0
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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 <string> 00022 #include <iostream> 00023 #include <unistd.h> 00024 #include <sys/time.h> 00025 #include <sys/resource.h> 00026 #include <boost/utility.hpp> 00027 #include "raul/log.hpp" 00028 00029 namespace Raul { 00030 00031 00036 class Process : boost::noncopyable 00037 { 00038 public: 00039 00044 static bool launch(const std::string& command) { 00045 const std::string executable = (command.find(" ") != std::string::npos) 00046 ? command.substr(0, command.find(" ")) 00047 : command; 00048 00049 const std::string arguments = command.substr((command.find(" ") + 1)); 00050 00051 info << "Launching child process '" << executable << "' with arguments '" 00052 << arguments << "'" << std::endl; 00053 00054 // Use the same double fork() trick as JACK to prevent zombie children 00055 const int err = fork(); 00056 00057 if (err == 0) { 00058 // (child) 00059 00060 // close all nonstandard file descriptors 00061 struct rlimit max_fds; 00062 getrlimit(RLIMIT_NOFILE, &max_fds); 00063 00064 for (rlim_t fd = 3; fd < max_fds.rlim_cur; ++fd) 00065 close(fd); 00066 00067 switch (fork()) { 00068 case 0: 00069 // (grandchild) 00070 setsid(); 00071 execlp(executable.c_str(), arguments.c_str(), NULL); 00072 _exit(-1); 00073 00074 case -1: 00075 // (second) fork failed, there is no grandchild 00076 _exit (-1); 00077 00078 /* exit the child process here */ 00079 default: 00080 _exit (0); 00081 } 00082 } 00083 00084 return (err > 0); 00085 } 00086 00087 private: 00088 Process() {} 00089 }; 00090 00091 00092 } // namespace Raul 00093 00094 #endif // RAUL_PROCESS_HPP