From af9d6791c82a9e848df66efa5fa569d2313812c9 Mon Sep 17 00:00:00 2001
From: Manuel Schneider
Date: Tue, 2 Sep 2014 19:14:52 +0200
Subject: Use plain c to fork and detach vm session start script.

---
 src/dialog.cpp | 86 ++++++++++++++++++++++++++++++++++------------------------
 1 file changed, 50 insertions(+), 36 deletions(-)

(limited to 'src/dialog.cpp')

diff --git a/src/dialog.cpp b/src/dialog.cpp
index ae157ba..2806d7c 100644
--- a/src/dialog.cpp
+++ b/src/dialog.cpp
@@ -15,6 +15,7 @@
 #include "globals.h"
 #include "vsession.h"
 #include "choosersettings.h"
+#include <unistd.h>
 
 Dialog::Dialog(QWidget *parent)
     : QDialog(parent), ui(new Ui::Dialog) {
@@ -79,44 +80,57 @@ void Dialog::changeEvent(QEvent *e) {
     }
 }
 
-void Dialog::on_treeView_activated(QModelIndex index) {
-    // this method gets called when a Session has been activated
-
-    SessionTreeItem* item =
-            static_cast<SessionTreeItem*>(index.internalPointer());
-
-    const Session* s(item->session());
-    if (!s) {
-        // no valid session has been selected, do nothing
-        return;
-    }
-
-		if (s->run()) {
-			// Run session start script
-			if (QFile::exists(sessionStartScript)) {
-					// Use the current environment variables and add the necessary
-					// information for the startUpScipt. In this case it is intended to tell
-					// the startupscript if the PVS should be started. Further in the future
-					// the session id will be passed this way.
-					QProcessEnvironment env = QProcessEnvironment::systemEnvironment();
-					if (ui->PVS_checkbox->isChecked()) {
-						env.insert("PVS_SESSIONID", "xxxx");
-					}
-					QProcess scriptProcess;
-					scriptProcess.setProcessEnvironment(env);
-					scriptProcess.start(sessionStartScript, QIODevice::ReadOnly);
-					scriptProcess.waitForFinished();
-					scriptProcess.close();
+void Dialog::on_treeView_activated(QModelIndex index)
+{
+	// this method gets called when a Session has been activated
+
+	SessionTreeItem* item =
+					static_cast<SessionTreeItem*>(index.internalPointer());
+
+	const Session* s(item->session());
+	if (!s) {
+			// no valid session has been selected, do nothing
+			return;
+	}
+
+	if (s->run())
+	{
+		// Run session start script
+		if (QFile::exists(sessionStartScript))
+		{
+			// Use the current environment variables and add the necessary
+			// information for the startUpScipt.
+			char pvs_ac[128];
+			sprintf(pvs_ac, "PVS_AUTO_CONNECT=%s", ui->PVS_checkbox->isChecked()?"TRUE":"FALSE");
+			putenv(pvs_ac);
+
+			// fork this process
+			pid_t pid = fork();
+			if (pid < 0)
+				exit(EXIT_FAILURE);
+
+			// Branch for the clone
+			if (pid == 0){
+				// At this point we are executing as the child process
+				// Create a new SID for the child process (detach)
+				pid_t sid = setsid();
+				if (sid < 0)
+					exit(EXIT_FAILURE);
+
+				// Replace this clone with the process we'd like to start
+				// execv seems to copy this environment.
+				char const * const args[] = {VMCHOOSER_SESSION_START_SCRIPT, NULL};
+				execv(VMCHOOSER_SESSION_START_SCRIPT, (char**)args);
 			}
-
-				ChooserSettings::setSetting("last-session", (s->shortDescription()));
-				ChooserSettings::setSetting("last-tab", QString::number(activeTab_));
-				setVisible(false);
-		} else {
-				QMessageBox::warning(
-								this, trUtf8("vmchooser"),
-								trUtf8("Vmchooser failed to run the selected session!"));
 		}
+		ChooserSettings::setSetting("last-session", (s->shortDescription()));
+		ChooserSettings::setSetting("last-tab", QString::number(activeTab_));
+		setVisible(false);
+	} else {
+		QMessageBox::warning(
+					this, trUtf8("vmchooser"),
+					trUtf8("Vmchooser failed to run the selected session!"));
+	}
 }
 
 void Dialog::addItems(const QList<Session*>& entries, int tab) {
-- 
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