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X-HELO: drew.franken.de
Date: Sat, 14 Jan 2017 16:37:56 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: borgbackup test fail on cygwin (only) - cygwin pipe issues?
Message-ID: <20170114153756.GB9762@calimero.vinschen.de>
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References: <8d66dac6-689d-972f-d06a-f4c1869b6b87 AT waldmann-edv DOT de> <6d5d6289-ea61-cd18-fb48-c5053f292e0f AT gmail DOT com> <dd6328f1-12ba-7faa-6d44-227986bb755b AT waldmann-edv DOT de> <326b4885-182e-841c-8522-2ec48841c9a4 AT waldmann-edv DOT de>
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On Jan 13 20:07, Thomas Waldmann wrote:
> On 01/13/2017 07:18 PM, Thomas Waldmann wrote:
> > It was a bug in our code that was triggered frequently by the small
> > cygwin pipe buffer size of only 64kiB.
> >=20
> > borgbackup fix/workaround see there:
> >=20
> > https://github.com/borgbackup/borg/pull/2032
> >=20
> > It (almost?) never happened on other OSes, due to their bigger buffers.
>=20
> Hmm, the last phrase seems not to be the real reason why it worked
> there, but rather that neither Linux nor *BSD ever do partial writes on
> blocking pipes.
>=20
> So, should cygwin also behave that ^^^ way on blocking pipes?

Yes.  I inspected the code and the current behaviout was apparently
an accident when refactoring the pipe write code.  I applied a patch
and uploaded new developer snapshots to https://cygwin.com/snapshots/
Please give them a try.


Thanks,
Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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