signotify_id_t
int cmd, siginfo_t *siginfo, signotify_id_t *sn_id)
signotify_id_t mq_sigid; /* notification id (3 int's) */
extern int __signotify(int cmd, siginfo_t *sigonfo, signotify_id_t *sn_id);
int signotify(int, siginfo_t *, signotify_id_t *);
if (copyin(sn_id, &id, sizeof (signotify_id_t)))
if (copyout(&id, sn_id, sizeof (signotify_id_t)))
signotify(int cmd, siginfo_t *siginfo, signotify_id_t *sn_id)
signotify_id_t id;