taglinefilesource code
TCP_CLOSING787net/ipv4/af_inet.ccase TCP_CLOSING:
TCP_CLOSING711net/ipv4/tcp.cif (sk->state == TCP_FIN_WAIT1 || sk->state == TCP_FIN_WAIT2 || sk->state == TCP_CLOSING ) 
TCP_CLOSING2280net/ipv4/tcp.ccase TCP_CLOSING:
TCP_CLOSING2437net/ipv4/tcp.csk->state == TCP_CLOSING ||
TCP_CLOSING3625net/ipv4/tcp.cif (sk->state == TCP_CLOSING) 
TCP_CLOSING3743net/ipv4/tcp.ccase TCP_CLOSING:
TCP_CLOSING3771net/ipv4/tcp.ctcp_set_state(sk,TCP_CLOSING);
TCP_CLOSING4936net/ipv4/tcp.csk->state != TCP_CLOSING