ssh session hangs while running cmd on remote server

Larry Hall (Cygwin)
Thu May 31 23:22:00 GMT 2007

Christopher Faylor wrote:
> On Thu, May 31, 2007 at 04:27:00PM -0400, Larry Hall (Cygwin) wrote:
>> Christopher Faylor wrote:
>>> There seems to be some confusion about the CYGWIN tty setting.
>>> The only time it should have any effect is when there is a console involved.
>>> In that scenario, what effectively happens is that CYGWIN opens up a pty
>>> and pretends that the pty is a linux-like tty.
>>> Setting CYGWIN=tty for servers should be a no-op.  Ditto, having it set
>>> while operating under a pty or if there is no console associated with the
>>> session.
>>> So, if setting CYGWIN=tty actually causes a problem in an ssh session
>>> then that is probably a Cygwin bug.  Until that problem has become evident
>>> lets not assume that there is a problem.
>>> I don't mean to be picking on you Larry.  You are not the only person
>>> I've seen opine about CYGWIN=tty .  I remain unconvinced that setting it
>>> would present a problem other than the standard problem of running pure
>>> Windows programs under a Cygwin pty.
>> The confusion may come from me. ;-)
>> So are you saying that all Cygwin services effectively use ptys?
>> Rereading the original post, I note that KenLee only said 'cmd' was started
>> once in the OpenSSH session.  I also assumed he invoked 'ssh' from a
>> console, which may make a difference if the answer to the above question
>> is "no".  But that assumption is unsubstantiated by the available
>> information. ;-)
> If he ssh'ed to somewhere interactively then there is a pty involved on
> the remote end where the program was being run so that's what would have
> caused any problem, IMO, regardless of the CYGWIN tty setting on the
> local end.  In that scenario, since ssh is a cygwin program it shouldn't
> care about the CYGWIN=tty setting one way or the other.

Understood.  Thanks.

Larry Hall                    
RFK Partners, Inc.                      (508) 893-9779 - RFK Office
216 Dalton Rd.                          (508) 893-9889 - FAX
Holliston, MA 01746


A: Yes.
> Q: Are you sure?
>> A: Because it reverses the logical flow of conversation.
>>> Q: Why is top posting annoying in email?

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