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Diffstat (limited to 'raul/Process.h')
-rw-r--r-- | raul/Process.h | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/raul/Process.h b/raul/Process.h new file mode 100644 index 0000000..698e1b9 --- /dev/null +++ b/raul/Process.h @@ -0,0 +1,85 @@ +/* This file is part of Raul. Copyright (C) 2006 Dave Robillard. + * + * Raul is free software; you can redistribute it and/or modify it under the + * terms of the GNU General Public License as published by the Free Software + * Foundation; either version 2 of the License, or (at your option) any later + * version. + * + * Raul is distributed in the hope that it will be useful, but WITHOUT ANY + * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS + * FOR A PARTICULAR PURPOSE. See the GNU General Public License for details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef RAUL_PROCESS_H +#define RAUL_PROCESS_H + +#include <string> +#include <iostream> +#include <unistd.h> + +/** A child process. + * + * \ingroup raul + */ +class Process +{ +public: + + /** Launch a sub process. + * + * @param command can be a typical shell command with parameters, the PATH is searched etc. + */ + bool launch(std::string command) + { + const string executable = (command.find(" ") != string::npos) + ? command.substr(0, command.find(" ")) + : command; + + std::cerr << "Launching child process '" << executable << "' with command line '" + << command << "'" << endl; + + // Use the same double fork() trick as JACK to prevent zombie children + const int err = fork(); + + if (err == 0) { + // (child) + + // close all nonstandard file descriptors + const int max_fds = getdtablesize(); + int fd; + for (fd = 3; fd < max_fds; ++fd) + close(fd); + + switch (fork()) { + + case 0: + // (grandchild) + setsid(); + execlp(executable.c_str(), command.c_str(), NULL); + _exit(-1); + + case -1: + // (second) fork failed, there is no grandchild + _exit (-1); + + /* exit the child process here */ + default: + _exit (0); + } + + return (err > 0); + } + +private: + // .... no :) (undefined) + Process(); + Process(const Process&); + Process& operator=(const Process&); +}; + + +#endif // RAUL_PROCESS_H |