--- src/qsynthMainForm.cpp.orig	2018-11-24 22:22:05.379321811 +0000
+++ src/qsynthMainForm.cpp	2018-11-24 22:34:10.000440303 +0000
@@ -578,7 +578,8 @@
 // Make and set a proper setup step.
 void qsynthMainForm::setup ( qsynthOptions *pOptions )
 {
-	// Finally, fix settings descriptor
+  catchUnixSignals({SIGQUIT, SIGINT, SIGTERM, SIGHUP});
+  // Finally, fix settings descriptor
 	// and stabilize the form.
 	m_pOptions = pOptions;
 
@@ -2607,6 +2608,26 @@
 	m_ui.TabBar->setCurrentIndex(iTab);
 }
 
+void qsynthMainForm::catchUnixSignals(std::initializer_list<int> quitSignals) {
+  auto handler = [](int sig) -> void {
+    // blocking and not aysnc-signal-safe func are valid
+    printf("\nquit the application by signal(%d).\n", sig);
+    QCoreApplication::quit();
+  };
+  
+  sigset_t blocking_mask;   
+  sigemptyset(&blocking_mask);  
+  for (auto sig : quitSignals) 
+    sigaddset(&blocking_mask, sig);  
+      
+  struct sigaction sa;   
+  sa.sa_handler = handler;   
+  sa.sa_mask    = blocking_mask;  
+  sa.sa_flags   = 0;    
+  
+  for (auto sig : quitSignals)   
+    sigaction(sig, &sa, nullptr);
+}
 
 // Close main form slot.
 void qsynthMainForm::quitMainForm (void)
--- src/qsynthMainForm.h.orig	2018-09-18 10:24:10.194784815 +0100
+++ src/qsynthMainForm.h	2018-11-24 22:30:22.009465089 +0000
@@ -115,7 +115,8 @@
 	void chorusChanged(int);
 
 	void activateEnginesMenu(QAction*);
-
+	
+  void catchUnixSignals(std::initializer_list<int> quitSignals);
 	void quitMainForm();
 
 	void commitData(QSessionManager& sm);