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Date:	Tue, 8 Apr 2025 21:11:50 +0200
To:	cygwin AT cygwin DOT com
Subject:	Re: ftruncate() may fail with EISDIR if other process calls open()
Message-ID:	<Z_V09jrhzQw5kXA5@calimero.vinschen.de>
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From:	Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>
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Cc:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
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On Apr  8 17:07, Christian Franke via Cygwin wrote:
> Corinna Vinschen via Cygwin wrote:
> > On Apr  8 13:50, Corinna Vinschen via Cygwin wrote:
> > > On Apr  7 09:59, Christian Franke via Cygwin wrote:
> > > > Found because 'stress-ng --fcntl 2 --verify' reports "ftruncate failed,
> > > > errno=21":
> > > Thanks for the testcase.  I know what happens.  Stay tuned for a patch.
> > Nice problem.  That's what happens if you try to do what an OS is doing,
> > without actually being an OS, just a user space lib.  Theoretically we
> > should never cache any file information but always call the matching OS
> > functions.  Only... this adds quite a few context switches every time
> > accessing files.  Sigh.
> > 
> > I just pushed 2d81f6ebe3dc ("Cygwin: open: always fix up cached DOS file
> > attributes after NtCreateFile").
> > 
> > Try the upcoming cygwin-3.7.0-0.47.g9e6193576f34.
> 
> With a local build of 3.7.0-dev-49-g42df80dad079.x86_64, both the testcase
> and stress-ng no longer fail.

Thanks for checking!


Corinna

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