From:	Thomas Demmer <demmer AT LSTM DOT Ruhr-UNI-Bochum DOT De>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: ctrl-c handling question
Date:	Wed, 28 Jan 1998 16:28:15 +0100
Organization:	Lehrstuhl fuer Stroemungsmechanik
Lines:	44
Message-ID:	<34CF4E8F.95E933D6@LSTM.Ruhr-UNI-Bochum.De>
References:	<01bd2bf2$0f2058a0$542c5c8b AT aptiva>
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Jerry van Dijk wrote:
> When running the following program:
>         int main(void){
>                 int i;
>                 i = 5;
>                 while (i == 5) {;}
> 
>                 return 0;
>         }
> pressing CTRL-C will abort it.
> However, when running the following program:
> 
>         int main(void)
>         {
>                 while (1) {
>                 }
>         } 
> pressing CTRL-C has no effect.
> Anyone have any idea as to the cause and how to get around it ?
> 
That's a flaw? of the DPMI host. It can only intercept
^C when your program touches memory. In the first case it does, 
unless you use -O2 or so to compile it. In the second case,
there is no need do access memory, everything is inside
registers. So, the DPMI host never sees the ^C.

I think there is no way to come around this.

I had to trim your program a bit, otherwise my news host
would not le me post it.
-- 
Ciao
Tom

*************************************************************
* Thomas Demmer                                             *
* Lehrstuhl fuer Stroemungsmechanik                         *
* Ruhr-Uni-Bochum                                           *
* Universitaetsstr. 150                                     *
* D-44780  Bochum                                           *
* Tel: +49 234 700 6434                                     *
* Fax: +49 234 709 4162                                     *
* http://www.lstm.ruhr-uni-bochum.de/~demmer                *
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