Re: [PATCH 4/6] BC: user interface (syscalls)

Kirill Korotaev
2006-08-25T10:54:08Z

Alexey Dobriyan wrote:
> On Thu, Aug 24, 2006 at 12:04:16PM +0100, Alan Cox wrote:
>
>>Ar Mer, 2006-08-23 am 21:35 -0700, ysgrifennodd Andrew Morton:
>>
>>>>Its a uid_t because of setluid() and twenty odd years of existing unix
>>>>practice.
>>>>
>>>
>>>I don't understand. This number is an identifier for an accounting
>>>container, which was somehow dreamed up by userspace.
>>
>>Which happens to be a uid_t. It could easily be anyother_t of itself and
>>you can create a container_id_t or whatever. It is just a number.
>>
>>The ancient Unix implementations of this kind of resource management and
>>security are built around setluid() which sets a uid value that cannot
>>be changed again and is normally used for security purposes. That
>>happened to be a uid_t and in simple setups at login uid = luid = euid
>>would be the norm.
>>
>>Thus the Linux one happens to be a uid_t. It could be something else but
>>for the "container per user" model whatever a container is must be able
>>to hold all possible uid_t values. So we can certainly do something like
>>
>>typedef uid_t container_id_t;
>
>
> What about cid_t? Google mentions cid_t was used in HP-UX specific IPC (only if
> _INCLUDE_HPUX_SOURCE is defined).
bcid_t?

Thanks,
Kirill