fget_unlocked_seq
static int fget_unlocked_seq(struct thread *td, int fd,
error = fget_unlocked_seq(td, fd, needrightsp, flagsp, &fp,
return (fget_unlocked_seq(td, fd, needrightsp, flagsp, fpp, NULL));
error = fget_unlocked_seq(td, fd, rightsp, NULL, &fp, &seq);
error = fget_unlocked_seq(td, fd, rightsp, NULL, &fp, &seq);