another instance of .. issues

[Brian Dessent]

Eric Blake wrote:

> and/or have openat() implemented directly in cygwin so that the
> openat emulation of open("/proc/self/fd/4/..") is avoided (not to
> mention more efficient by avoiding several other syscalls during
> the emulation).

I think implementing openat() directly would be the clear win here,
since the ".." processing seems to be such a landmine.  Of course
without a patch this is just hot air on my part.

Brian

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