change_owner
change_owner = chown;
change_owner = lchown;
if ((*change_owner)(p->fts_accpath, uid, gid) && !fflag) {
int (*change_owner)(const char *, uid_t, gid_t);
static int change_owner(struct vnode *, uid_t, gid_t, struct lwp *, int);
error = change_owner(vp, uid, gid, l, 0);
error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 1);
error = change_owner(fp->f_vnode, SCARG(uap, uid), SCARG(uap, gid),
error = change_owner(fp->f_vnode, SCARG(uap, uid), SCARG(uap, gid),
error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 0);
error = change_owner(vp, SCARG(uap, uid), SCARG(uap, gid), l, 1);