evch_evq_evnext
while ((ev = evch_evq_evnext(sdp->sd_queue, ev)) != NULL) {
while ((ev = evch_evq_evnext(chp->ch_queue, ev)) != NULL) {
evch_evq_evnext(evch_subq, evch_curev)) != NULL) {
evch_evq_evnext(evch_chan->ch_queue, evch_curev)) ==
snp->sn_nxtev = (sysevent_impl_t *)evch_evq_evnext(snp->sn_queue,