1.7.5: Occasional failure of CreatePipe or signal handing due to thread-unsafe code in cwdstuff::set

John Carey aeolus@electric-cloud.com
Thu Sep 2 23:32:00 GMT 2010

On Aug 12 01:11, Corinna Vinschen wrote:
> On Aug 12 06:54, Andy Koppe wrote:
> > On 11 August 2010 20:55, John Carey wrote:
> > > So is your idea that if SetCurrentDirectory() fails because
> > > of path length or permissions, then Cygwin would just accept
> > > the failure and keep an internal record the
> > > POSIX current working directory and use that for all
> > > Cygwin calls, not the Win32 notion of current directory?
> >
> > Yes. The question then becomes what to do about the Win32 working
> > directory in that case.
> Actually, Cygwin accepts *any* directory it can open as CWD:
> - Directories which can only be opened under SE_BACKUP_NAME.
> - Directories with a length up to 32768 chars.
> - Virtual directories, which don't exist at all as filesystem-based
>   paths, like /proc, /cygdrive, etc.

In Aug 17 10:15, Corinna Vinschen wrote:
> I just released 1.7.6-1.
> What changed since Cygwin 1.7.5:
> ================================
> - Cygwin handles the current working directory entirely on its own.  The
>   Win32 current working directory is set to an invalid path to be out of
>   the way.  This affects calls to the Win32 file API (CreateFile, etc.).
>   See http://cygwin.com/htdocs/cygwin-ug-net/using.html#pathnames-win32-api

Thank you very much for the fix!

I've been running tests against Cygwin 1.7.6, and then 1.7.7,
and those sporadic, non-deterministic failures in CreatePipe
did stop after the 1.7.6 upgrade, and are still gone in 1.7.7.
I think it's been long enough to conclude that it is not just
the non-determinism--it really is fixed, as expected.

I understand that this issue opened a can of worms;
thanks again for your efforts to overcome those difficulties.

-- John

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