Re: should divide-by-zero generate a SIGFPE?

[Paul Goyette <paul%whooppee.com@localhost>]

Oh, my cut&paste missed one important line.  It also calls fpsetmask(3) 
before trying to divide-by-zero:

        {
                double d = strtod("0", NULL);
                ...
                sigaction(SIGFPE, &sa, NULL);
> > > >                 fpsetmask(FP_X_INV|FP_X_DZ|FP_X_OFL|FP_X_UFL|FP_X_IMP);
                printf("%g\n", 1 / d);
                ...


On Fri, 24 Dec 2010, Paul Goyette wrote:

> As some of you have noticed, I've been slowly migrating some of the old 
> src/regress tests to the new atf format.  I've discovered that the test for 
> SIGFPE in src/regress/lib/libc/siginifo/sigfpe/ doesn't work.  It attempts 
> trigger a signal by
>
>         {
>                 double d = strtod("0", NULL);
>                 ...
>                 sigaction(SIGFPE, &sa, NULL);
>                 printf("%g\n", 1 / d);
>                 ...
>
> But the routine specified in sa.sa_sigaction does not get called, and the 
> test fails.
>
> So, is this expected behavior?  I did a quick bug search and didn't find 
> anything relevant.
>
> If this is expected, is there some other way to reliably generate a SIGFPE?
>
>
> BTW, if it matters, I'm doing this on port-amd64.
>
>
> -------------------------------------------------------------------------
> | Paul Goyette     | PGP Key fingerprint:     | E-mail addresses:       |
> | Customer Service | FA29 0E3B 35AF E8AE 6651 | paul at whooppee.com    |
> | Network Engineer | 0786 F758 55DE 53BA 7731 | pgoyette at juniper.net |
> | Kernel Developer |                          | pgoyette at netbsd.org  |
> -------------------------------------------------------------------------

-------------------------------------------------------------------------
| Paul Goyette     | PGP Key fingerprint:     | E-mail addresses:       |
| Customer Service | FA29 0E3B 35AF E8AE 6651 | paul at whooppee.com    |
| Network Engineer | 0786 F758 55DE 53BA 7731 | pgoyette at juniper.net |
| Kernel Developer |                          | pgoyette at netbsd.org  |
-------------------------------------------------------------------------