doq_conn_send_close
if(!doq_conn_send_close(c, conn))
int doq_conn_send_close(struct comm_point* c, struct doq_conn* conn);
if(!doq_conn_send_close(c, conn)) {
if(!doq_conn_send_close(c, conn))
int doq_conn_send_close(struct comm_point* c, struct doq_conn* conn);
if(!doq_conn_send_close(c, conn)) {