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From: Helmut Karlowski <helmut DOT karlowski AT ish DOT de>
To: cygwin AT cygwin DOT com
Subject: Re: /dev/tty does not work from shell
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References: <54DA31C1 DOT 9060406 AT redhat DOT com> <54DA32D9 DOT 5070909 AT redhat DOT com>
Date: Tue, 10 Feb 2015 17:46:47 +0100
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--------------------------------------------------
Eric Blake <eblake AT redhat DOT com> wrote:
(10/02/2015 17:33)

> On 02/10/2015 09:28 AM, Eric Blake wrote:
> > 
> > The bug is in cygwin1.dll, not bash.  Here's a STC; opening a file
> > should NOT change its st_ino number, but that's exactly what cygwin is
> > doing to /dev/tty.  As such, bash thinks that because the ino changed
> > between stat() and open() that there is a race of someone trying to do
> > bad things behind bash's back, and noclobber restrictions kick in to
> > prevent bash from using the file.
> 
> The same test from the command line:
> 
> $ stat -c %i /dev/tty - 0>/dev/tty
> 327680
> 8912896
> 
> use any other (already-existing) file to see that the two numbers should
> normally be the same.

Don't know why, but cygwin is not the only OS that does that. I'd 
suggest to check for terminal or something.

-Helmut



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