SetSockOpt
if (debug && SetSockOpt(net, SOL_SOCKET, SO_DEBUG, 1) < 0) {
(SetSockOpt(net, SOL_SOCKET, SO_DEBUG, debug)) < 0) {
extern int SetSockOpt(int, int, int, int);
if (SetSockOpt(net, SOL_SOCKET, SO_OOBINLINE, 1) == -1) {