GUI: handle SIGTERM correctly

issue #1143

src/gui/gui.cpp

@@ -6666,6 +6666,10 @@ bool FurnaceGUI::finish() {
   return true;
 }
 
+void FurnaceGUI::requestQuit() {
+  quit=true;
+}
+
 FurnaceGUI::FurnaceGUI():
   e(NULL),
   renderBackend(GUI_BACKEND_SDL),

src/gui/gui.h

@@ -2306,6 +2306,7 @@ class FurnaceGUI {
     bool loop();
     bool finish();
     bool init();
+    void requestQuit();
     FurnaceGUI();
 };
 

src/main.cpp

@@ -36,7 +36,10 @@
 
 typedef HRESULT (WINAPI *SPDA)(PROCESS_DPI_AWARENESS);
 #else
+#include <signal.h>
 #include <unistd.h>
+
+struct sigaction termsa;
 #endif
 
 #include "cli/cli.h"
@@ -356,6 +359,14 @@ void reportError(String what) {
 }
 #endif
 
+#ifndef _WIN32
+#ifdef HAVE_GUI
+static void handleTermGUI(int) {
+  g.requestQuit();
+}
+#endif
+#endif
+
 // TODO: CoInitializeEx on Windows?
 // TODO: add crash log
 int main(int argc, char** argv) {
@@ -646,6 +657,11 @@ int main(int argc, char** argv) {
     g.setFileName(fileName);
   }
 
+  sigemptyset(&termsa.sa_mask);
+  termsa.sa_flags=0;
+  termsa.sa_handler=handleTermGUI;
+  sigaction(SIGTERM,&termsa,NULL);
+
   g.loop();
   logI("closing GUI.");
   g.finish();