change_mode
change_mode = lchmod;
change_mode = chmod;
if ((*change_mode)(p->fts_accpath, nval) && !fflag) {
int (*change_mode)(const char *, mode_t);
static int change_mode(struct vnode *, int, struct lwp *);
error = change_mode(vp, mode, l);
error = change_mode(fp->f_vnode, SCARG(uap, mode), l);
error = change_mode(vp, SCARG(uap, mode), l);