Closes #4236. Patch allows you to force a Theme Reload by sending a

kill -USR1 to the frontend. Very useful for theme developers to force 
a quick theme reload with a "killall -USR1 mythfrontend"




git-svn-id: http://svn.mythtv.org/svn/trunk@15290 7dbf422c-18fa-0310-86e9-fd20926502f2

mythtv/programs/mythfrontend/main.cpp

@@ -803,6 +803,17 @@ void InitJumpPoints(void)
     TV::SetEmbedPbbFunc(PlaybackBox::RunPlaybackBox);
 }
 
+
+void signal_USR1_handler(int){
+      VERBOSE(VB_GENERAL, "SIG USR1 received, reloading theme");	
+      RemoteSendMessage("CLEAR_SETTINGS_CACHE");
+      gContext->ActivateSettingsCache(false);
+      qApp->processEvents();
+      GetMythMainWindow()->JumpTo("Reload Theme");
+      gContext->removeCurrentLocation();
+      gContext->ActivateSettingsCache(true);
+}
+
 int internal_media_init() 
 {
     REG_MEDIAPLAYER("Internal", "MythTV's native media player.", 
@@ -1410,6 +1421,13 @@ int main(int argc, char **argv)
         if (!RunMenu(themedir))
             break;
 
+        struct sigaction new_action, old_action;
+        /* Set up the structure to specify the new action. */
+        new_action.sa_handler = signal_USR1_handler;
+        ::sigemptyset(&new_action.sa_mask);
+        new_action.sa_flags = 0;
+        ::sigaction (SIGUSR1, &new_action, &old_action);
+
         qApp->setMainWidget(mainWindow);
         qApp->exec();
     } while (!(exitstatus = handleExit()));