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Process.hpp

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

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