bsd/kern/uipc_usrreq.c

1036 	struct socket *so2, *so3, *list_so=NULL;
1048 	so2 = so3 = NULL;
1139 		    (so3 = sonewconn(so2, 0, nam)) == 0) {
1154 		unp3 = sotounpcb(so3);
1193 			socket_lock(so3, 0);
1194 			sofreelastref(so3, 1);
1203 		mac_socketpeer_label_associate_socket(so, so3);
1204 		mac_socketpeer_label_associate_socket(so3, so);
1212 		/* Lock ordering doesn't matter because so3 was just created */
1213 		socket_lock(so3, 1);
1214 		so2 = so3;