[EchoClient] add flag to disable the final quit message

apps/EchoClient.cpp

@@ -69,6 +69,7 @@ size_t size = SIZE;
 size_t server_backlog = SERVER_BACKLOG;
 bool linked_futures;
 bool histogram = false;
+bool sendQuit = true;
 
 std::atomic<bool> terminate = false;
 
@@ -226,8 +227,8 @@ class Client {
 	}
 
  public:
-	void shutdown(bool sendQuit) const {
-		if (sendQuit) {
+	void shutdown(bool isQuitClient) const {
+		if (sendQuit && isQuitClient) {
 			LOGI("Send quit message");
 			std::string msg = "quit\n";
 			ssize_t res = emper::io::sendAndWait(sock, msg.c_str(), msg.size(), MSG_NOSIGNAL);
@@ -438,6 +439,8 @@ auto main(int argc, char* argv[]) -> int {
 		}
 	}
 
+	sendQuit = !existsOption(argc, argv, "--no-quit");
+
 	int histogram_fd;
 	char* histogram_file = getOption(argc, argv, "--histogram");
 	if (histogram_file) {