/dev/tty does not work from shell

Eric Blake eblake@redhat.com
Tue Feb 10 16:33:00 GMT 2015

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

use any other (already-existing) file to see that the two numbers should
normally be the same.

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

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