Implement clean shutdown after receiving Unix signals, resolves #169

The database wasn't saved properly and lockfiles were not removed when receiving the signals SIGINT, SIGTERM, SIGQUIT or SIGHUP. This patch implements signal handling and performs a clean shutdown after receiving SIGINT SIGTERM or SIGQUIT and ignores SIGHUP.

Since this uses POSIX syscalls for signal and socket handling, there is no Windows implementation at the moment.

1 files changed, 16 insertions, 1 deletions

diff --git a/src/gui/Application.h b/src/gui/Application.h
index 149b61ddf..44e03d2f8 100644
--- a/src/gui/Application.h
+++ b/src/gui/Application.h
@@ -21,6 +21,8 @@
 
 #include <QApplication>
 
+class QSocketNotifier;
+
 class Application : public QApplication
 {
     Q_OBJECT
@@ -34,8 +36,21 @@ public:
 Q_SIGNALS:
     void openFile(const QString& filename);
 
-private:
+private Q_SLOTS:
+    void quitBySignal();
+
+private:    
     QWidget* m_mainWindow;
+    
+#if defined(Q_OS_UNIX)
+    /**
+     * Register Unix signals such as SIGINT and SIGTERM for clean shutdown.
+     */
+    void registerUnixSignals();
+    QSocketNotifier* m_unixSignalNotifier;
+    static void handleUnixSignal(int sig);
+    static int unixSignalSocket[2];
+#endif
 };
 
 #endif // KEEPASSX_APPLICATION_H