File::Stat#readable_real?

static VALUE
rb_stat_R(VALUE obj)
{
    rb_io_stat_data *st = get_stat(obj);

#ifdef USE_GETEUID
    if (getuid() == 0) return Qtrue;
#endif
#ifdef S_IRUSR
    if (rb_stat_rowned(obj))
        return RBOOL(st->ST_(mode) & S_IRUSR);
#endif
#ifdef S_IRGRP
    if (rb_group_member(get_stat(obj)->ST_(gid)))
        return RBOOL(st->ST_(mode) & S_IRGRP);
#endif
#ifdef S_IROTH
    if (!(st->ST_(mode) & S_IROTH)) return Qfalse;
#endif
    return Qtrue;
}