taglinefilesource code
urginline634net/inet/af_inet.csk->urginline = 0;
urginline193net/inet/sock.csk->urginline = 1;
urginline195net/inet/sock.csk->urginline = 0;
urginline288net/inet/sock.cval = sk->urginline;
urginline80net/inet/sock.hurginline,
urginline932net/inet/tcp.csk->urginline || !sk->urg_data)
urginline1964net/inet/tcp.cif (sk->urginline || !sk->urg_data || sk->urg_data == URG_READ)
urginline2164net/inet/tcp.cif (!sk->urginline)