kern_kevent_fp
error = kern_kevent_fp(td, epfp, nchanges, 0, &k_ops, NULL);
error = kern_kevent_fp(td, epfp, 0, maxevents, &k_ops, tsp);
return (kern_kevent_fp(td, epfp, 1, 0, &k_ops, NULL));
error = kern_kevent_fp(td, fp, nchanges, nevents, k_ops, timeout);
int kern_kevent_fp(struct thread *td, struct file *fp, int nchanges,