Date: Fri, 23 Jan 2009 08:46:59 -0500
From: avadekar@certicom.com
To: "cygwin@cygwin.com" <cygwin@cygwin.com>
Subject: Re: Signal handling in WIN32 console programs
Message-ID: <20090123134659.GA7000@certicom.com>
Reply-To: avadekar@certicom.com
References: <20090119164151.GA28574@certicom.com> <4978EBF0.3090104@gmail.com> <20090122220422.GA19936@ednor.casa.cgf.cx> <20090122230524.GA5850@certicom.com> <20090123101034.GA32232@calimero.vinschen.de>
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On Fri, Jan 23, 2009 at 05:10:34AM -0500, Corinna Vinschen wrote:
> On Jan 22 18:05, avadekar@certicom.com wrote:
> > On Thu, Jan 22, 2009 at 05:04:23PM -0500, Christopher Faylor wrote:
> > > On Thu, Jan 22, 2009 at 09:58:08PM +0000, Andy Koppe wrote:
> > > > avadekar@certicom.com wrote:
> > > >>  So I
> > > >>wonder if the native console passes the character to the process
> > > >>directly whereas the minTTY/rxvt shells interpret it and send a signal
> > > >>that the native app doesn't really understand properly.
> > > >
> > > >MinTTY and rxvt do not interpret the ^C keypress in any special way.
> > > >They simply write a ^C (0x03) character to the child process' pty.  The
> > > >pty driver may translate that into a signal depending on the pty's line
> > > >settings (as shown by stty).  Sorry I don't know how ^C is processed in
> > > >a Windows console or why the behaviour would be different with ptys.
> > > 
> > > The operative term here is, once again, "Windows Console".  A pure
> > > Windows program running in MinTTY or rxvt does not have a windows
> > > console and so won't see the type of SIGINT that the windows console
> > > generates.
> > 
> > Is there something that I could do inside the native application code to catch
> > what it is getting?  I've tried SetConsoleCtrlhandler, but that also never
> > gets invoked prior to the process termination.
> 
> No.  The Cygwin tty apps like rxvt and MinTTY are using POSIX signal
> handling.  The implementation for that only exists in Cygwin and only
> Cygwin applications are able to deal with them.
> 
> Corinna

It seems that it ought to map to something, or else it wouldn't actually do
anything.  But given that you say I can't do what I'm trying within the posix
shell, I suppose I could have the application open its own console (which would
be native), and then a Ctrl-C in that window would presumably do what I want.

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