# Pastebin M75pXHUG
// because the fields are 'long' and we just want to cast to `unsigned`
#define X(idx, name)                                                    \
  fields[offset + idx] = ((unsigned long)(s->st_##name.tv_sec) * 1e3) + \
                ((unsigned long)(s->st_##name.tv_nsec) / 1e6);