Re: [tbox-l] Tcl over SSH problem (revisited)

[David C. <cl...@au...>]

I remember trying this and seeing the same behavior myself some time ago.
We've been waiting on clearance to distribute 8.4.7 for some time now, and
it has been hinted to me that this may finally happen relatively soon
(though it is not a certainty until it actually happens, so I hope this is
not a false alarm).

Meanwhile, I'll try out a re-build with the patch in [2].


On Wed, Mar 16, 2005 at 10:45:24PM +0100, Markus Alt wrote:
> Hi all,
> 
> lately a user here ran into a problem that seems to be same as the one
> described in [1]. He logged into a remote machine using OpenSSH and ran
> a Tcl script. This script was executed, but afterwards the SSH
> connection just "hung", i.e. he did not get a shell prompt.
> 
> I could easily reproduce this with either the well-known
> 
> 
> #!/usr/bin/tclsh
> 
> puts "Hello world"
> 
> 
> or by just typing "tclsh" and then "exit" at tclsh's prompt. In addition
> to that, two persons at other IBM sites that I've contacted did also see
> this behaviour. So it seems to me as if the bug described in [1] still
> exists in the AIX Toolbox for Linux Tcl RPM.
> 
> Apparently it is related to the way Tcl handles input/output to
> stdin/stdout, as "helloworldscript | cat -" surprisingly worked! And it
> also only happens with an OpenSSH connection; after logging in via
> telnet or rlogin there was no problem with Tcl.
> 
> This is on AIX 5.1 with Tcl 8.3.3 and various version of OpenSSH
> (self-compiled 3.9p1 as well as the 3.8.1p1 LPP provided by IBM for AIX
> 5.1).
> 
> I've done some more tests with other - older and newer - Tcl versions
> that we and other IBM sites have installed in distributed filesystem and
> found the following:
> 
>  - versions 7.3, 7.4 and 8.0 worked
>  - version 8.2 did *not* work
>  - versions 8.3.1 and 8.3.3 (both from AIX Toolbox RPMs) did *not* work
>  - version 8.3.4 did *not* work
>  - version 8.4.4 worked
> 
> Looks like this obvious bug has been introduced in the Tcl code after
> 8.0 and fixed in the latest 8.4 release. Googling for "tcl 8 ssh" I've
> found a bug report [2] from 2001 that refers to AIX 4.3.3, but seems to
> exactly describe the problem.
> 
> So finally my questions are:
> 
>  1. Can anybody reproduce this behaviour?
>  2. If yes, are there plans to release an updated Tcl RPM? Either the
> same version with a patch or a new version (i.e. 8.4). (Yes, I know
> about the legal battle with newer versions ... :-/ )
> 
> Any comments are much appreciated!
> 
> TIA & regards,
> Markus
> 
> 
> [1]
> http://sourceforge.net/tracker/index.php?func=detail&aid=1150486&group_id=128955&atid=712808
> [2] http://aspn.activestate.com/ASPN/Mail/Message/tcl-bugs/822555
> 
> -- 
> Markus Alt
> IBM Lab Boeblingen, Germany
> al...@de...
> 
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-- 
David Clissold
cl...@au...