taglinefilesource code
keepopen121include/net/sock.hkeepopen,
keepopen188net/core/sock.csk->keepopen = valbool;
keepopen269net/core/sock.cval = sk->keepopen;
keepopen950net/ipv4/tcp.cif (sk->keepopen)
keepopen1804net/ipv4/tcp.csk->keepopen = 1;
keepopen913net/ipv4/tcp_input.c} else if (sk->keepopen) {
keepopen1077net/ipv4/tcp_input.cif (sk->keepopen) 
keepopen837net/ipv4/tcp_output.cif(sk->keepopen)