vn_fullpath
error = vn_fullpath(curproc, vn->sc_vp,
if (vn_fullpath(curproc, vp, &fullpath, &freepath, 0)) {
error = vn_fullpath(td->td_proc, vrtmp, &fullpath, &freepath, 0);
vn_fullpath(imgp->proc, imgp->vp, &imgp->execpath,
int vn_fullpath (struct proc *p, struct vnode *vn, char **retbuf, char **freebuf, int guess);
vn_fullpath(p, vp, &fullpath, &freepath, 1);