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Date: Thu, 26 Apr 2018 13:01:59 +0200
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From: Houder <houder AT xs4all DOT nl>
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To: cygwin AT cygwin DOT com
Subject: Re: Bug: Synchronous signals broken on Cygwin 64
References: <bc993d03-a9ac-d1c9-c33a-03cfc810edbe AT users DOT sourceforge DOT net> <d76cfa4797d30702799a93892d454d95 AT smtp-cloud9 DOT xs4all DOT net> <4a3b47db-fcdb-85f0-ec80-4cffcb7c495a AT users DOT sourceforge DOT net>
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On Thu, 26 Apr 2018 12:52:54, Thomas Zimmermann wrote:

> Hi
> 
> Am 26.04.2018 um 12:45 schrieb Houder:
> >> The expected behavior is that an installed signal handler runs exactly
> >> once for a signal and the OS terminates the program if the handler
> >> returns. This works on 32-bit Cygwin. From my observation, Cygwin 64
> >> differs in the follow ways:
> >=20
> > .. uhm, unless SA_RESETHAND (sa_flags) has been specified, I expect the
> > handler to be invoked again and again ...
> 
> What I mean is that the installed signal handler is re-called constantly
> for the same HW exception (div-by-zero in this case). It is as if
> there's an endless loop around the signal-handler function.

After the invocation of the handler, the program continues with the code
that attempts 'to divide by zero'.

As result of that, the handler is invoked again.

Henri

> Best regards
> Thomas


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