Ulrich Drepper wrote:
>
> "H. Peter Anvin" <hpa@transmeta.com> writes:
>
> > The distinction you're referring to is the distinction of a real path
> > versus a bogus path -- you cannot under any circumstances construct a
> > path which uses one of those artificial roots.
> >
> > POSIX IPC requires a real path. It needs to be in the real namespace,
> > which starts with /.
>
> There are several things wrong with this.
>
> POSIX shm function require a name. This is left very vague for good
> reason. The only other requirement made for portable program is that
> the names must start with a slash. The handling os slashes in the
> name (i.e., if the name actually is a pathname) is left implementation
> defined.
>
> What is not the case (and I think you meant this) is that if the name
> given to shm_open() is a pathname, the name must also be available in
> this form in the normal filesystem hierachy. This is not the case
> even if the name is used somewhere in the filesystem tree.
>
> Take a look at the shm_open() implementation in glibc 2.2. It gets
> very clear what I mean if you see the code.
>
This is true based on what the POSIX requirements are, but what I wrote
is true *for the Linux implementation of POSIX shm.* We did it that way
because it makes sense.
-hpa
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