RFC: close-on-exec internal file descriptors

[Joel Brobecker]

> Sorry Joel.
> I did not even consider this possibility.

No worries at all!

> Could you try the appended?  I can't even build parts of it, so...
> 
> I think it is pretty ugly, since it is a layer on top of the
> kernel-level cloexec flags.  However, that is another discussion, from
> the earlier reviews.

Yeah, hard to see an alternative based on the decisions made.
Seems OK to me.

I tested the patches, and they look good to me, except for the fact
that we were missing the #include of filestuff.h. Attached is patch
that builds and tests fine on x86_64-darwin and ia64-hpux...

-- 
Joel
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