bug#10021: [PATCH id] Add error-checking on GNU

[Ludovic Courtès]

Hi Paul,

Paul Eggert <address@hidden> skribis:

> -      if (GETID_MAY_FAIL && euid == -1 && !use_real
> +      if (euid < 0 && !use_real
>            && !just_group && !just_group_list && !just_context)
>          error (EXIT_FAILURE, errno, _("cannot get effective UID"));

On GNU/Hurd, no error would ever be raised (since uid_t is unsigned),
which defeats the purpose of the patch initially proposed.

Thanks,
Ludo’.