Linux下connect()函数阻塞与非阻塞
各位好，今天遇到一个奇怪的问题。在写socket客户端的程序时，发现connect()函数有时阻塞，有时非阻塞。且大部分时间是非阻塞的。下面是代码：

               socket_list[i].socket = socket(AF_INET,SOCK_STREAM,0);
                setsockopt(socket_list[i].socket,SOL_SOCKET,SO_KEEPALIVE,&optval,sizeof(optval));

                address.sin_family = AF_INET;
                address.sin_addr.s_addr = netParam.srv[i].ip.s_addr;
                address.sin_port = htons(netParam.srv[i].port);//(in_port_t)->(uint16_t)
                len = sizeof(address);
                printf("connect to srv %d\n",i);
                result = connect(socket_list[i].socket,(struct sockaddr *)&address,len);
                if(result == -1)
                {
                    socket_list[i].used = 0;
                    socket_list[i].pass = 0;
                    printf("can not connected to server %d.\n",i);
                }
                else
                {
                    printf("connected to server %d.\n",i);
                    socket_list[i].used = 1;
                    xml_request(i);
                }

请大家帮忙看看是啥个问题么，谢谢了。 linux socket
[解决办法]
“发现connect()函数有时阻塞，有时非阻塞”，返回-1时你没把socket设置为非阻塞，那就是出错了，不是什么非阻塞，这时应该把errno打出来看看，到底是什么错误。