summaryrefslogtreecommitdiffstats
path: root/raul/Process.h
diff options
context:
space:
mode:
Diffstat (limited to 'raul/Process.h')
-rw-r--r--raul/Process.h85
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