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Subject: Re: floating point exception
From: Christian Thalinger <e9625286@student.tuwien.ac.at>
To: Zwane Mwaikambo <zwane@linux.realnet.co.sz>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
        "Richard B. Johnson" <root@chaos.analogic.com>
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Date: 15 Jan 2002 19:19:13 +0100
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On Tue, 2002-01-15 at 15:34, Zwane Mwaikambo wrote:
> On 14 Jan 2002, Christian Thalinger wrote:
> 
> > It seems the floating point exception is only raised with a new data
> > package. Is there a simple way to raise such a exception?
> 
> New data package? And does the same behaviour re-occur after the fpu
> exception? ie programs start segfaulting etc. Can you try doing a "dmesg"
> after the segfaults and fpu exception and see if there is anything in the
> kernel ring buffer too.
> 
> Regards,
> 	Zwane Mwaikambo
> 

There are .sah files, in which the data is stored to analyse. So i
deleted these files and the client downloads a new package -> new data
package.

Yes, it did happen that the segfault reoccured and there is nothing in
the dmesg. This was also my first thought, then checked
/var/log/messages with a tail and it stucked. No ctrl-c.

Tried this:

#define _GNU_SOURCE 1
#include <fenv.h>

main() {
    double zero=0.0;
    double one=1.0;
    
    feenableexcept(FE_ALL_EXCEPT);
    
    one /=zero;
}

...but nothing happens.