VOP_READLINK
error = VOP_READLINK(ndp->ni_vp, &auio, cnp->cn_cred);
error = VOP_READLINK(vp, uiop, cred);
error = VOP_READLINK(vp, ap->a_uio, ap->a_cred);
error = VOP_READLINK(foundobj, &auio, cnp->cn_cred);
if ((error = VOP_READLINK(vp, &auio, l->l_cred)) == 0)
error = VOP_READLINK(vp, uiop, cred);
error = VOP_READLINK(vp, uio, cred);
int VOP_READLINK(struct vnode *, struct uio *, kauth_cred_t);