perror("connfd<0");

                                               exit(1);

                                     }

                                     setnonblocking(connfd);

                                     char *str = inet_ntoa(clientaddr.sin_addr);

                                     std::cout << "connec_ from >>" << str << std::endl;

                                     // 设置用于读操作的文件描述符

                                     ev.data.fd = connfd;

                                     // 设置用于注测的读操作事件

                                     ev.events = EPOLLIN | EPOLLET;

                                     // 注册 ev