taglinefilesource code
keepopen106include/net/sock.hkeepopen,
keepopen173net/core/sock.csk->keepopen = valbool;
keepopen251net/core/sock.cval = sk->keepopen;
keepopen660net/ipv4/af_inet.csk->keepopen = 0;
keepopen1595net/ipv4/tcp.cif(sk->keepopen) {
keepopen1713net/ipv4/tcp.cif (sk->keepopen) 
keepopen3160net/ipv4/tcp.csk->keepopen = 1;
keepopen3366net/ipv4/tcp.cif (sk->keepopen) 
keepopen3741net/ipv4/tcp.c} else if (sk->keepopen) {