From: Eric Blake <eblake@redhat.com>
To: cygwin@cygwin.com
Subject: Re: /dev/stderr problem
Date: Mon, 17 Oct 2016 18:11:00 -0000 [thread overview]
Message-ID: <1957a989-fe56-ca68-ddc2-83bc59480ccd@redhat.com> (raw)
In-Reply-To: <nu1rav$te3$2@blaine.gmane.org>
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On 10/17/2016 01:32 AM, Thorsten Kampe wrote:
> * Thorsten Kampe (Mon, 17 Oct 2016 08:25:13 +0200)
>
>> the following bash script results in a different output when
>> 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.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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next prev parent reply other threads:[~2016-10-17 13:51 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-17 6:34 Thorsten Kampe
2016-10-17 13:51 ` Thorsten Kampe
2016-10-17 18:11 ` Eric Blake [this message]
2016-10-17 18:29 ` Linda Walsh
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