tag	line	file	source code
send_fin	2540	net/ipv4/tcp.c	int send_fin=0;
send_fin	2548	net/ipv4/tcp.c	send_fin=1;
send_fin	2561	net/ipv4/tcp.c	send_fin=1;
send_fin	2584	net/ipv4/tcp.c	return send_fin;