SetSockOpt
if (telnet_debug && SetSockOpt(net, SOL_SOCKET, SO_DEBUG, 1) < 0) {
(SetSockOpt(net, SOL_SOCKET, SO_DEBUG, telnet_debug)) < 0) {
if (net > 0 && SetSockOpt(net, SOL_SOCKET, SO_DEBUG, 1) < 0)
SetSockOpt(int, int, int, int),
if (SetSockOpt(net, SOL_SOCKET, SO_OOBINLINE, 1) == -1) {