kevent_to_str
char * kevent_to_str(struct kevent *);
kev_str = kevent_to_str(kev);
kev1_str = kevent_to_str(k1);
kev2_str = kevent_to_str(k2);
kev_str = kevent_to_str(&kev);
kev_str = kevent_to_str(&kev);
kev_str = kevent_to_str(kevp);
errx(1, "NOTE_CHILD and NOTE_EXIT in same kevent: %s", kevent_to_str(kevp));
errx(1, "Spurious NOTE_CHILD: %s", kevent_to_str(kevp));
errx(1, "Spurious NOTE_EXIT: %s", kevent_to_str(kevp));
errx(1, "Spurious NOTE_FORK: %s", kevent_to_str(kevp));
errx(1, "Spurious kevent: %s", kevent_to_str(kevp));