add remark for signal handler

echo/client/app/main.go

@@ -110,6 +110,7 @@ func uninitClient() {
 }
 
 func initSignal() {
+	// signal.Notify的ch信道是阻塞的(signal.Notify不会阻塞发送信号), 需要设置缓冲
 	signals := make(chan os.Signal, 1)
 	// It is not possible to block SIGKILL or syscall.SIGSTOP
 	signal.Notify(signals, os.Interrupt, os.Kill, syscall.SIGHUP, syscall.SIGQUIT, syscall.SIGTERM, syscall.SIGINT)

echo/server/app/server.go

@@ -147,6 +147,7 @@ func uninitServer() {
 }
 
 func initSignal() {
+	// signal.Notify的ch信道是阻塞的(signal.Notify不会阻塞发送信号), 需要设置缓冲
 	signals := make(chan os.Signal, 1)
 	// It is not possible to block SIGKILL or syscall.SIGSTOP
 	signal.Notify(signals, os.Interrupt, os.Kill, syscall.SIGHUP, syscall.SIGQUIT, syscall.SIGTERM, syscall.SIGINT)