ct_ctl_ack
(void) ct_ctl_ack(efd, evid);
(void) ct_ctl_ack(ctfd, evid);
(void) ct_ctl_ack(fd, ct_event_get_evid(e));
(void) ct_ctl_ack(efd, evid);
(void) ct_ctl_ack(efd, evid);
(void) ct_ctl_ack(ctlfd, evid);
(void) ct_ctl_ack(ctlfd, evid);
extern int ct_ctl_ack(int, ctevid_t);