added signal

redcon.go

@@ -93,14 +93,26 @@ func (s *Server) Close() error {
 
 // ListenAndServe serves incoming connections.
 func (s *Server) ListenAndServe() error {
+	return s.ListenServeAndSignal(nil)
+}
+
+// ListenServeAndSignal serves incoming connections and passes nil or error
+// when listening. signal can be nil.
+func (s *Server) ListenServeAndSignal(signal chan error) error {
 	var addr = s.addr
 	var handler = s.handler
 	var accept = s.accept
 	var closed = s.closed
 	ln, err := net.Listen("tcp", addr)
 	if err != nil {
+		if signal != nil {
+			signal <- err
+		}
 		return err
 	}
+	if signal != nil {
+		signal <- nil
+	}
 	s.ln = ln.(*net.TCPListener)
 	defer func() {
 		ln.Close()

redcon_test.go

@@ -292,7 +292,14 @@ func TestServer(t *testing.T) {
 			t.Fatal("expecting array, got '%v'", res)
 		}
 	}()
-	err := s.ListenAndServe()
+	signal := make(chan error)
+	go func() {
+		err := s.ListenServeAndSignal(signal)
+		if err != nil {
+			t.Fatal(err)
+		}
+	}()
+	err := <-signal
 	if err != nil {
 		t.Fatal(err)
 	}