On Jun 25 20:51, Lavrentiev, Anton (NIH/NLM/NCBI) [C] wrote:
> Hello,
>
> The following code produces FPE_FLTSUB(22) for the signal code whereas all
> platforms (Linux, Mac, FreeBSD) where I tested it, consistently yield
> FPE_FLTINV
> (which on CYGWIN has a value of 21):
>
> #define _GNU_SOURCE
> #include <fenv.h>
> #include <signal.h>
> #include <stdio.h>
> #include <string.h>
> #include <unistd.h>
>
> void sigfpe(int signo, siginfo_t* si, void* ucontext)
> {
> printf("code = %d\n", si->si_code);
> _exit(255);
> }
>
> int main()
> {
> double a = 0, b = 0;
> struct sigaction sa;
> memset(&sa, 0, sizeof(sa));
> sa.sa_sigaction = sigfpe;
> sa.sa_flags = SA_SIGINFO;
> sigaction(SIGFPE, &sa, 0);
> feenableexcept(FE_ALL_EXCEPT);
> printf("%lf", a / b);
> return 0;
> }
>
> I suppose that this block of code in exceptions.cc is not particularly
> correct, 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):
>
> case STATUS_FLOAT_DENORMAL_OPERAND:
> case STATUS_FLOAT_DIVIDE_BY_ZERO:
> case STATUS_FLOAT_INVALID_OPERATION:
> case STATUS_FLOAT_STACK_CHECK:
> si.si_signo = SIGFPE;
> si.si_code = FPE_FLTSUB;
> break;
>
> 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 -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Maintainer cygwin AT cygwin DOT com Red Hat
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