Re: [RFA] Add handling of Ctrl-Break for win32 native target.

[Pierre Muller <muller@cerbere.u-strasbg.fr>]

At 17:52 04/02/2002 , vous avez écrit:
>On Mon, Feb 04, 2002 at 04:04:47PM +0100, Pierre Muller wrote:
> >2002-02-04  Pierre Muller  <muller@ics.u-strasbg.fr>
> >          win32-nat.c (handle_exception): Handle Ctrl-Break exception.
> >
>
>Looks good.  Please check it in.

I tried, but I can't get the lock for /cvs/src/src/gdb
cvs server: [09:25:31] waiting for muller's lock in /cvs/src/src/gdb
cvs server: [09:26:01] waiting for muller's lock in /cvs/src/src/gdb

I am not sure that I understand this message correctly:
I am waiting until I can get a lock for muller (i.e. myself)
or is there some zombie processs somewhere on the cvs server?

>I'm looking forward to the patch to handle the pass state.

  The main problem is that this will only partially work because of a known bug
in the win32 API:

Extracted from
http://www.microsoft.com/msj/defaultframe.asp?page=/msj/0898/bugslayer0898.htm&nav=/msj/0898/newnav.htm

There are a couple of issues to remember when using SetUnhandledExceptionFilter. 
The first is that any exception filter that you set cannot be debugged. This is a known bug. 
Knowledge Base article Q173652 says that under a debugger the process wide filter is not called. 
This can be a bit of a pain, but in a C++ program you can just use your function in a regular SEH exception 
filter to debug it. If you look at the CH_TEST.CPP test program, which is part of this month's source code 
(Aug98Bugslayer.exe ), this is exactly what I did to debug it. 
An alternative is to use a kernel debugger like WinDBG to get around this limitation.

But I don't really know if Cygwin library uses SetUnhandledExceptionFilter
(I suspect it does as my patch does not work as intended...).

I will send a [RFC] when all seems ready, even if it does not fully work...


Pierre Muller
Institut Charles Sadron
6,rue Boussingault
F 67083 STRASBOURG CEDEX (France)
mailto:muller@ics.u-strasbg.fr
Phone : (33)-3-88-41-40-07  Fax : (33)-3-88-41-40-99