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


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