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Subject:	Re: mkfifo: cannot set permissions of 'x.fifo': Not a directory
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From:	Martin Wege via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Martin Wege <martin DOT l DOT wege AT gmail DOT com>
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On Tue, Aug 8, 2023 at 10:20 AM Corinna Vinschen
<corinna-cygwin AT cygwin DOT com> wrote:
>
> On Aug  7 23:14, Martin Wege via Cygwin wrote:
> > On Mon, Aug 7, 2023 at 9:14 PM Corinna Vinschen
> > <corinna-cygwin AT cygwin DOT com> wrote:
> > >
> > > On Aug  7 12:26, Brian Inglis via Cygwin wrote:
> > > > On 2023-08-07 08:42, Martin Wege via Cygwin wrote:
> > > > > We get a weird mkfifo failure in Cygwin on NTFS:
> > > > >
> > > > > /usr/bin/mkfifo -m 600 x.fifo
> > > > > mkfifo: cannot set permissions of 'x.fifo': Not a directory
> > > >
> > > > This error is also reproducible with default fifo permissions 666 or
> > > > anything else, and appears to be returned by gen_full_path_at() in
> > > > syscalls.cc when called with a fifo:
> > >
> > > This will be fixed in 3.4.8,
> >
> > Thank you
> >
> > > see
> > > https://cygwin.com/git/?p=newlib-cygwin.git;a=commit;h=b56b4d7fd85b
> >
> > First, Can I download a beta of  3.4.8, or any other version with that
> > fix? It's pretty urgent
>
> You can install a test release of Cygwin, simply by using the setup tool
> These test releases are always created from the git main branch, though,
> so they are always test releases of the next major version, currently
> 3.5.0.

Where can I download the Setup.exe tool for those test releases?

>
> > Secondly, how are fifos, other device nodes and mknod implemented? You
> > encode them as softlinks on ntfs?
>
> Not only on NTFS.  FIFOs on the disk are always created as symlinks
> with a special target string, recognized by Cygwin.  No differece on
> NFS.  Microsoft NFSv3 has no way to specify creating a "real" FIFO
> on the remote filesystem.  It wouldn't make sense anyway, because
> there's no way to share the FIFO across systems.

So no Windows ioctl to do a mknod?

What does a Linux/FreeBSD FIFO file look like, if you export that
filesystem via NFSv3, and mount it via the native Windows NFSv3
driver, and do a ls -l in Cygwin?

Thanks,
Martin

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