Function _fgetvp

freebsd/kern/kern_descrip.c:3504–3524

* Like fget() but loads the underlying vnode, or returns an error if the * descriptor does not represent a vnode. Note that pipes use vnodes but * never have VM objects. The returned vnode will be vref()'d. * * XXX: what about the unused flags ? */

 * XXX: what about the unused flags ?
 */
static __inline int
_fgetvp(struct thread *td, int fd, int flags, cap_rights_t *needrightsp,
    struct vnode **vpp)
{
	struct file *fp;
	int error;

	*vpp = NULL;
	error = _fget(td, fd, &fp, flags, needrightsp);
	if (error != 0)
		return (error);
	if (fp->f_vnode == NULL) {
		error = EINVAL;
	} else {
		*vpp = fp->f_vnode;
		vrefact(*vpp);
	}
	fdrop(fp, td);

	return (error);
}

int
fgetvp(struct thread *td, int fd, cap_rights_t *rightsp, struct vnode **vpp)