RFC: named anonymous vmas

[Christoph Hellwig]

On Thu, Aug 01, 2013 at 04:36:08AM -0400, Rich Felker wrote:
> I'm not sure what the purpose is. shm_open with a long random filename
> and O_EXCL|O_CREAT, followed immediately by shm_unlink, is just as
> good except in the case where you have a malicious user killing the
> process in between these two operations.

The Android people already have an shm API doesn't leave traces in the
filesystem, and I at least conceptually agree that having an API that
doesn't introduce posisble other access is a good idea.  This is the
same reason why the O_TMPFILE API was added in this releases.