Opinions solicted for changes to tty names in 1.7.10

Christopher Faylor cgf-use-the-mailinglist-please@cygwin.com
Wed Jun 15 20:53:00 GMT 2011

On Wed, Jun 15, 2011 at 09:46:24PM +0100, Andy Koppe wrote:
>On 15 June 2011 15:55, Christopher Faylor wrote:
>> On Wed, Jun 15, 2011 at 01:28:55PM +0100, Andy Koppe wrote:
>>>On 14 June 2011 21:36, Christopher Faylor wrote:
>>>> After some discussion with Corinna, I'm thinking about making a change to
>>>> the tty naming in Cygwin as part of the removal of CYGWIN=tty.
>>>> (In case you haven't noticed, CYGWIN=tty, is no longer supported in
>>>> snapshots. ??If you do have the tty option set you get one warning per
>>>> session telling you to unset it.)
>>>> Since the only thing using Cygwin's "tty layer" will now be ptys, I'd
>>>> like to rename /dev/ttyN to /dev/ptyN. ??I've already added /dev/consN
>>>> support for consoles but I'd like to change that so that consoles are
>>>> represented as /dev/ttyN instead.
>>>Makes plenty of sense.
>>>The only concern I see is that BSD PTYs (as previously used on Linux
>>>as well, IIRC) are called "pty[p-za-e][0-9a-f]" on the master side,
>>>whereas they're "tty[p-za-e][0-9a-f]" on the slave side. Therefore
>>>calling the slave side "ptyN" could conceivably cause issues.
>>>Is the Unix98 scheme ("/dev/pts/N") that's used on Linux these days
>>>out of the question?
>> No. ??I considered that but adding an arbitrary directory structure under
>> out /dev kludge seemed wrong. ??I would prefer to make it look more like
>> Linux though. ??The man reason why I didn't implement that is that I
>> thought someone would report that "ls /dev/pts" doesn't work
>Good point. Unlike "ls /dev/pty*", it would actually be useful as it's
>supposed to contain the currently used ptys.
>> not that it couldn't be made to work.
>That would be nice.

I agree.  So, I guess I'll look into what it would take to implement
that and hold off the renaming for now.  I'm going to be gone for two
weeks starting on Friday so this won't happen soon though.

>The terminal is supposed to cut off all of "/dev/tty", especially as
>Cygwin's ut_id is only 2 chars, whereas Linux's is 4.

Oh right.  I knew that.


More information about the Cygwin-apps mailing list