How can I stop winsock2 from blocking, when I call recvfrom on a UDP socket? It says on MSDN that if the socket is set as non-blocking and there is no data to be received, then SOCKET_ERROR is returned and the error code set to WSAEWOULDBLOCK. I think setsockopt() is used to set it as non-blocking but I cant find the option to set it as blocking or non blocking. Can anyone help? Thanks Steve

ioctlsocket()

wow, thanks, great help