Add sig{quit,term,int} handler that just quits application

main.go

@@ -112,7 +112,10 @@ func main() {
 	go sigHandler()
 	signal.Notify(sigChan,
 		syscall.SIGUSR1,
-		syscall.SIGUSR2)
+		syscall.SIGUSR2,
+		syscall.SIGQUIT,
+		syscall.SIGTERM,
+		syscall.SIGINT)
 
 	// Populate memory stats
 	if Conf.Mem.Enabled {

signal.go

@@ -25,6 +25,9 @@ func sigHandler() {
 
 			UpdateReady <- true
 
+		case syscall.SIGQUIT, syscall.SIGTERM, syscall.SIGINT:
+			os.Exit(0)
+
 		// We have signal that we're not interested in, so make a new loop iteration.
 		default:
 			continue