dcd_poll
if (dcd_poll(pkt) == 0) {
if (dcd_poll(pkt) || SCBP_C(pkt) != STATUS_GOOD ||
if ((dcd_poll(pkt)) || (SCBP_C(pkt) != STATUS_GOOD)) {
static int dcd_poll(struct dcd_pkt *pkt);
extern int dcd_poll(struct dcd_pkt *);
extern int dcd_poll();