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Date:	Tue, 26 Jun 2018 10:14:09 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: FPE_FLTSUB where FLT_FLTINV is expected
Message-ID:	<20180626081409.GO28757@calimero.vinschen.de>
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On Jun 25 20:51, Lavrentiev, Anton (NIH/NLM/NCBI) [C] wrote:
> Hello,
>=20
> The following code produces FPE_FLTSUB(22) for the signal code whereas al=
l platforms (Linux, Mac, FreeBSD) where I tested it, consistently yield FPE=
_FLTINV
> (which on CYGWIN has a value of 21):
>=20
> #define _GNU_SOURCE
> #include <fenv.h>
> #include <signal.h>
> #include <stdio.h>
> #include <string.h>
> #include <unistd.h>
>=20
> void sigfpe(int signo, siginfo_t* si, void* ucontext)
> {
>     printf("code =3D %d\n", si->si_code);
>     _exit(255);
> }
>=20
> int main()
> {
>     double a =3D 0, b =3D 0;
>     struct sigaction sa;
>     memset(&sa, 0, sizeof(sa));
>     sa.sa_sigaction =3D sigfpe;
>     sa.sa_flags =3D SA_SIGINFO;
>     sigaction(SIGFPE, &sa, 0);
>     feenableexcept(FE_ALL_EXCEPT);
>     printf("%lf", a / b);
>     return 0;
> }
>=20
> I suppose that this block of code in exceptions.cc is not particularly co=
rrect, and only the last case (STACK_CHECK) actually pertains to the FLTSUB=
 situation,
> while all previous labels should be redirected to FPE_FLTINV (which, BTW,=
 seems not being used at all in CYGWIN):
>=20
>     case STATUS_FLOAT_DENORMAL_OPERAND:
>     case STATUS_FLOAT_DIVIDE_BY_ZERO:
>     case STATUS_FLOAT_INVALID_OPERATION:
>     case STATUS_FLOAT_STACK_CHECK:
>       si.si_signo =3D SIGFPE;
>       si.si_code =3D FPE_FLTSUB;
>       break;
>=20
> Thanks for looking into this!

Thanks for the testcase!  I pushed a patch.  Expect new devloper
snapshots on https://cygwin.com/snapshots later today.


Thanks,
Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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