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;
Alan
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