notting@redhat.com wrote on 06/07/2013 15:08:59:

> Right, it would break something that requires sharing SHM segments across
> sessions, or between system and sessions via 0666 SHM segments. I'm just
> curious what things actually do that.

I've seen this done with the Progress RDBMS where multiple data server processes share block buffers, semaphores, etc.  They also used the trick mentioned earlier of making a file and unlinking it while still open (or however exactly that's done) to have certain things (local user process block buffers, IIRC) removed automatically.

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John Florian