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Mail Archives: cygwin/2009/02/20/13:05:44

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Date: Fri, 20 Feb 2009 19:05:15 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Strange freezes when using gdb (rxvt/mintty but not dos box)
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On Feb 20 12:45, Christopher Faylor wrote:
> On Fri, Feb 20, 2009 at 06:26:17PM +0100, Corinna Vinschen wrote:
> >On Feb 20 12:13, Christopher Faylor wrote:
> >> On Fri, Feb 20, 2009 at 04:45:00PM +0000, Dave Korn wrote:
> >> >Roland Schwingel wrote:
> >> >>gdb freezes upon execution of the inferior process when used from
> >> >>within mintty/rxvt, but does not freeze when gdb is invoked from a
> >> >>(conventional) bash inside of a windows DOS box.
> >> >[...]
> >> >>But why does it work with DOS box and not using mintty/rxvt???
> >> >
> >> >Clue here.  You are launching a win32 app, from a cygwin app, in a
> >> >(non-console-based) GUI window.  Won't work.  Use a console.  See
> >> >discussions around CYGWIN=tty for full details (which, if you had it
> >> >set, ought to make the crash occur in a console as well as in
> >> >rxvt/mintty, but isn't anything you can turn off for rxvt and get it
> >> >working).
> >> 
> >> Right on, Dave.  There are all sorts of potential problems with using
> >> a cygwin pty/tty and a mingw process.
> >> 
> >> So: what he said.
> >
> >What about the new-console option in Cygwin's GDB to create the inferior
> >process in a new Console window?  Shouldn't that help here, as long as
> >the pty is actually running in the local GUI session.
> 
> I don't think that resets stdin/stdout for the inferior process so I
> doubt that it would help.

Indeed, that could be a problem.  I was just wondering if this win32
app doesn't actually opens the console by itself and uses functions
like WriteConsole.  That could explain why it hangs.


Corinna

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

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