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Date: Fri, 08 Jan 2016 17:12:57 +0100
From: Houder <houder AT xs4all DOT nl>
To: cygwin AT cygwin DOT com
Subject: Re: Pipes Again -- a simple test case
In-Reply-To: <20160108151933.GI20447@calimero.vinschen.de>
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On 2016-01-08 16:19, Corinna Vinschen wrote:
> On Jan  4 10:24, Houder wrote:
>> On 2016-01-04 09:52, Marco Atzeri wrote:
>> >On 04/01/2016 09:03, Houder wrote:
>> >>Hi Corinna,
>> >>
>> >>I have been looking for an STC to show why cmp fails on Cygwin (and to
>> >>show the
>> >>difference between Cygwin and Linux).
>> >>
>> >>The STC below creates a pipe (pipe() is used), followed by calls to
>> >>fstat() and
>> >>stat() for both the read end and the write end of the pipe.
>> >>
>> >>(I also tested with popen()/pclose(): same result)
>> >>
>> >>Regards,
>> >>Henri
> 
> Thanks for the STC.  However, given how this stuff works internally,
> I have no good solution off the top of my head.  I played with various
> ideas but to no avail.  I add this to my TODO list, but I probably
> won't have a quick solution :(
> 
> 
> Thanks,
> Corinna
> 
> 
> P.S: It would be really helpful if you could stick to the original
>      thread and simply use "reply-to" once a discussion has started.
>      It's very confusing having to connect the various threads.  
> Thanks.

Perhaps David B. can be helped by a Cygwin-specific patching to "cmp"? 
Eric?

... replacing the call to fstat() by a call to stat() ...
(as shown in https://cygwin.com/ml/cygwin/2015-12/msg00348.html)

By the way, thank you for reporting back to "us" about this. I already
feared that a "general" solution would have to wait ... You have already
too much on your plate.

As a final point, I also tested FIFOs and (unix domain) sockets.

FIFOs pass the test, sockets do not.

Regards,

Henri

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