PORTQ_POLLIN
if (portq->portq_flags & PORTQ_POLLIN) {
portq->portq_flags &= ~PORTQ_POLLIN;
portq->portq_flags |= events & POLLIN ? PORTQ_POLLIN : 0;
if (portq->portq_flags & PORTQ_POLLIN &&
portq->portq_flags &= ~PORTQ_POLLIN;
portq->portq_flags & PORTQ_POLLIN) {
portq->portq_flags &= ~PORTQ_POLLIN;