ptyfs_update
static int ptyfs_update(struct vnode *, const struct timespec *,
error = ptyfs_update(vp, &vap->va_atime, &vap->va_mtime, 0);
(void)ptyfs_update(vp, &ts, &ts, 0);
(void)ptyfs_update(vp, &ts, &ts, 0);