taglinefilesource code
urginline100include/net/sock.hurginline,
urginline176net/core/sock.csk->urginline = valbool;
urginline263net/core/sock.cval = sk->urginline;
urginline662net/ipv4/af_inet.csk->urginline = 0;
urginline1214net/ipv4/tcp.csk->urginline || !sk->urg_data)
urginline2169net/ipv4/tcp.cif (sk->urginline || !sk->urg_data || sk->urg_data == URG_READ)
urginline2369net/ipv4/tcp.cif (!sk->urginline)