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Date: Thu, 22 Jan 2009 18:05:24 -0500
From: avadekar AT certicom DOT com
To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject: Re: Signal handling in WIN32 console programs
Message-ID: <20090122230524.GA5850@certicom.com>
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References: <20090119164151 DOT GA28574 AT certicom DOT com> <4978EBF0 DOT 3090104 AT gmail DOT com> <20090122220422 DOT GA19936 AT ednor DOT casa DOT cgf DOT cx>
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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 AT certicom DOT com wrote:
> >>My WIN32 app is compiled under vc7 and uses signal() to trap SIGINT,
> >>SIGABRT and SIGTERM.  If I run the application under console2 or a
> >>native terminal, pressing ^C triggers the handler and the application
> >>stops programmatically due to a state change made by the handler.  When
> >>I do the same under rxvt (not the X based one) or minTTY, the ^C stops
> >>the process without the signal handler executing.  Similarly, even when
> >>run from the native console, kill (-INT, -ABRT, -TERM) causes the
> >>application to end without the handler catching the signal.  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.

> 
> cgf
> 
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