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Date:	Thu, 26 Jan 2006 17:21:21 +0100
From:	Alex Riesen <raa DOT lkml AT gmail DOT com>
To:	Eric Blake <ericblake AT comcast DOT net>
Subject:	Re: cygwin-1.5.19-2: mkdir returns inconsistent errno
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On 1/26/06, Eric Blake <ericblake AT comcast DOT net> wrote:
> > > > This is highly unexpected, does not match linux behaviour (it returns EEXIST),
> > > > and actually breaks git (git clone, creation of pathnames, to be precise).
> > >
> > > Then git has a bug.  Report it there.  To be portable
> > > when making pathnames, you must first check
> > > for directory existance rather than relying on an
> > > errno of EEXIST to tell you the directory exists.
> >
> > How do you do it race-free?
>
> chdir().  If chdir() succeeded, then the directory existed,
> regardless of the errno that mkdir() reported.
> Take a look at gnulib's mkdir-p.c module:
> http://cvs.savannah.gnu.org/viewcvs/gnulib/lib/mkdir-p.c?rev=1.5&root=gnulib&view=auto

Very interesting! Thank you for this and the other references.
I'm given hope! :)

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