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Date:	Fri, 2 Oct 2009 13:24:48 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: snapshot 20091002 and xterm crash
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On Oct  2 12:12, Andy Koppe wrote:
> 2009/10/2 Corinna Vinschen:
> >
> > [Ping Yaakov]
> >
> >
> > On Oct  2 09:04, Marco Atzeri wrote:
> >> Hi,
> >>
> >> xterm abort when run in snapshot 20091002
> >> reverting to 20090924 solve the issue.
> >>
> >> Run as:
> >> DISPLAY=127.0.0.1:0.0 xterm  -ls /usr/bin/bash.exe
> >
> > I can reproduce that.  I found the problem and it's really puzzeling.
> >
> > In the snapshot 2009-10-02, the default charset for the "C" locale is
> > set to UTF-8 for the application.  In 2009-09-24, it was only using
> > UTF-8 for filenames and other system objects by default.
> >
> > When starting xterm with no locale environment variable set, it fails
> > to start.  If you're quick enough, you can read a message along the
> > lines of "Cannot allocate pty: No such file ..."
> 
> That could be a luit problem:
> 
> http://www.mail-archive.com/cygwin-xfree AT cygwin DOT com/msg19129.html

Uh, I see.  Thanks for the pointer.

> > However, starting xterm works if you set, for instance, the environment
> > variable $LANG to "C.UTF-8".  This works:
> >
> >  DISPLAY=127.0.0.1:0.0 LANG=C.UTF-8 xterm
> >
> > However, even though newlib handles "UTF8" same as "UTF-8", it's
> > apparently not the same for xterm.
> 
> Random guess: xterm recognises "UTF-8" in $LANG and concludes that no
> translation is needed. It doesn't recognise "UTF8" (without the
> hyphen), nor does it know that plain "C" now implies "UTF-8", hence it
> invokes "luit" to do the translation, which fails for the reason
> above.
> 
> No idea why the luit problem didn't show up more prominently before though ...

Indeed.

So it's not xterm, it's luit.  That explains the weird strace output
which shows that, for some reason, xterm tries to open /dev/ptyxx,
which isn't available on Cygwin.

I guess I can drop the ashen look from my face again.  Not being able to
use UTF-8 by default would have rendered a good amount of work of the
last couple of days useless.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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