/dev/tty does not work from shell

Helmut Karlowski helmut.karlowski@ish.de
Tue Feb 10 18:32:00 GMT 2015


--------------------------------------------------
Helmut Karlowski <helmut.karlowski@ish.de> wrote:
(10/02/2015 19:04)

> 
> --------------------------------------------------
> Eric Blake <eblake@redhat.com> wrote:
> (10/02/2015 18:34)
> 
> > On 02/10/2015 09:46 AM, Helmut Karlowski wrote:
> > >> 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.
> > 
> > Umm, what other OS changes the inode from what you called stat() on to
> 
> Well, I tested again and found that the inode only changes when I do 
> this in bash:
> 
> ksh:
> 675|/home/root}stat -c %i /tmp/tty - 0>/tmp/tty
> 835940
> 835940
> 676|/home/root}bash
> root@IRAC root # stat -c %i /dev/tty - 0>/dev/tty
> 713246
> 80052544

Ok, messed up the test. For /dev/tty it's the same for both shells and
both OS. I looked it up in MiNT, and found ino is an internal pointer 
with no meaning to the outside.

If it's legal to look up the inode of a device, then both OS should be
fixed I think.

-Helmut




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