taglinefilesource code
keepopen104include/net/sock.hkeepopen,
keepopen171net/core/sock.csk->keepopen = valbool;
keepopen249net/core/sock.cval = sk->keepopen;
keepopen665net/ipv4/af_inet.csk->keepopen = 0;
keepopen1409net/ipv4/tcp.cif(sk->keepopen) {
keepopen1527net/ipv4/tcp.cif (sk->keepopen) 
keepopen2974net/ipv4/tcp.csk->keepopen = 1;
keepopen3180net/ipv4/tcp.cif (sk->keepopen) 
keepopen3555net/ipv4/tcp.c} else if (sk->keepopen) {