, attr string, dest []byte) (sz int, err error) {  var _p0 *byte  _p0, err = BytePtrFromString(attr)  if err != nil {   return  }  var _p0 unsafe.Pointer  if len(dest) > 0 {   _p0 = unsafe.Pointer(&dest[0])  } else {   _p0 = unsafe.Pointer(&_zero)  }  r0, _, e0 := Syscall0(SYS_