Winsock

long CUDPInterface::OpenPort()
{
    m_connection_state = false;
    if(m_sock != INVALID_SOCKET)
        Close();
 
    m_sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 
    timeval timeout = {0};
    timeout.tv_usec = m_lReadTimeout;
 
    setsockopt(m_sock, SOL_SOCKET, SO_RCVTIMEO, (char*)&timeout, sizeof(timeout));
    setsockopt(m_sock, SOL_SOCKET, SO_SNDTIMEO, (char*)&timeout, sizeof(timeout));  
    int buffsize = 2048;
    if ( setsockopt(m_sock, SOL_SOCKET, SO_RCVBUF, reinterpret_cast<const char*>(&buffsize), sizeof(buffsize)) != SOCKET_ERROR );
        
    sockaddr_in dest_addr;
    dest_addr.sin_family            = AF_INET;
    dest_addr.sin_addr.s_addr       = htonl(INADDR_ANY);
    dest_addr.sin_port              = htons((u_short)m_lPort);
 
    m_last_connect_try = GetTickCount();
    if(bind(m_sock,(struct sockaddr *)&dest_addr,sizeof(dest_addr))==SOCKET_ERROR)
    {
        int res = WSAGetLastError ();
        return false;
    }
 
    // restart the socket mode
 
    fd_set Write, Err, Read;
    FD_ZERO(&Write);
    FD_ZERO(&Err);
    FD_ZERO(&Read);
    FD_SET(m_sock, &Write);
    FD_SET(m_sock, &Err);
    FD_SET(m_sock, &Read);
 
    // check if the socket is ready
    select(0, &Read, &Write, &Err, &timeout);   
    
    if(FD_ISSET(m_sock, &Write)/* && FD_ISSET(m_sock, &Read)*/) 
    {
        m_connection_state = true;
        return true;
    }
    else
    {
        int res = WSAGetLastError ();
        Close();
        return 0;//iRes;
    }
    
}