taglinefilesource code
urginline627net/inet/af_inet.csk->urginline = 0;
urginline191net/inet/sock.csk->urginline = 1;
urginline193net/inet/sock.csk->urginline = 0;
urginline286net/inet/sock.cval = sk->urginline;
urginline80net/inet/sock.hurginline,
urginline930net/inet/tcp.csk->urginline || !sk->urg_data)
urginline1962net/inet/tcp.cif (sk->urginline || !sk->urg_data || sk->urg_data == URG_READ)
urginline2162net/inet/tcp.cif (!sk->urginline)