Add singleapplication for service

GPService/GPService.pro

@@ -4,6 +4,9 @@ QT -= gui
 CONFIG += c++11 console
 CONFIG -= app_bundle
 
+include(../singleapplication/singleapplication.pri)
+DEFINES += QAPPLICATION_CLASS=QCoreApplication
+
 # The following define makes your compiler emit warnings if you use
 # any Qt feature that has been marked deprecated (the exact warnings
 # depend on your compiler). Please consult the documentation of the

GPService/main.cpp

@@ -1,11 +1,10 @@
-#include <QCoreApplication>
 #include <QtDBus>
-
 #include "gpservice.h"
+#include "singleapplication.h"
 
 int main(int argc, char *argv[])
 {
-    QCoreApplication a(argc, argv);
+    SingleApplication app(argc, argv);
 
     if (!QDBusConnection::systemBus().isConnected()) {
         qWarning("Cannot connect to the D-Bus session bus.\n"
@@ -15,5 +14,5 @@ int main(int argc, char *argv[])
 
     new GPService;
 
-    return a.exec();
+    return app.exec();
 }