Set socket to blocking mode

(1) The socket works in non-blocking mode, and set the acceptance timeout

C / C ++ code

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// 创建套接字 SOCKET sock = WSASocket(AF_INET, SOCK_STREAM, IPPOROTO_TCP, NULL, 0, WSA_FLAG_OVERLAPPED); if (INVALID_SOCKET == sock) {   printf ( "WSASocket call failed. Error code: %d" , WSAGetLastError()); } // int  nTimeout = 5*1000; //设置超时5秒 setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, ( char *)&nTimeout,  sizeof (nTimeout));