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Subject: Re: /dev/stderr problem
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From: Eric Blake <eblake AT redhat DOT com>
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Date: Mon, 17 Oct 2016 08:51:26 -0500
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From: Eric Blake <eblake AT redhat DOT com>
To: cygwin AT cygwin DOT com
Message-ID: <1957a989-fe56-ca68-ddc2-83bc59480ccd AT redhat DOT com>
Subject: Re: /dev/stderr problem
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On 10/17/2016 01:32 AM, Thorsten Kampe wrote:
> * Thorsten Kampe (Mon, 17 Oct 2016 08:25:13 +0200)
>=20
>> the following bash script results in a different output when=20
>> redirected to a file.
>>
>> ```
>> printf "FIRST LINE\n" > /dev/stderr
>> shopt -os xtrace
>> printf "SECOMD LINE\n" > /dev/stderr

Cygwin treats '> /dev/stderr' as a request to truncate /dev/stderr (or,
for that matter, any opening of a file under /proc/self/fd).  Other
platforms treat that as a special file that can never be truncated, but
is instead reopened at the same offset.

Maybe cygwin can be taught that opening a file through /proc/self/fd
should preserve rather than reset offsets, but it will be a tricky
patch, and someone has to write it.

--=20
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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