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    SubjectRe: Why is chmod(2)?
    Werner Almesberger wrote:
    > Jamie Lokier wrote:
    > > I recommend coding a patch to find out if O_NONE is really as easy as it
    > > seems.
    >
    > Note that the equivalent of O_NONE has been around on Linux since '92 or
    > so (numeric value 3, I usually call it O_NOACCESS). It is required for
    > things like fdformat and setfdprm. LILO also uses it. So the "main code
    > path" already supports this. Drivers looking at f_mode or f_flags may be
    > a different story, though.

    I'm suggesting a file opened O_NONE would never call driver code.
    It's just an inode reference, for the same kind of operations you can do
    with a file name.

    So fstat() and close() are allowed, but ioctl(), fcntl(), read()
    etc. will all fail without calling any drivers or filesystem code.

    -- Jamie

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