"Michael Kerrisk" <mtk.manpages@xxxxxxxxxxxxxx> writes:
> On Fri, Jul 25, 2008 at 12:36 PM, Andreas Jaeger <aj@xxxxxxxxxx> wrote:
>> "Michael Kerrisk" <mtk.manpages@xxxxxxxxxxxxxx> writes:
>>
>>> Well, for example, according to my tests, cos(3) does not set errno.
>>> Is that what you would have expected?
>>
>> No, I wouldn't.
>
> (Slightly confused here, since you seem to contradict my result, but
> then the text below seems to agree with my result. But maybe I'm just
> misreading your text.)
I was confused as well ;)
>> And double checking, it's the other way round :-(. We
>> test the exception handling, not the error handling, so tests like
>> (libc/math/libm-test.inc) these
>>
>> TEST_f_f (cos, plus_infty, nan_value, INVALID_EXCEPTION);
>> TEST_f_f (cos, minus_infty, nan_value, INVALID_EXCEPTION);
>>
>> test that cos with input plus/minus infinity returns a NaN and raises
>> and invalid exception which is tested with fetestexcept. And if you
>> have different results, please tell me,
>
> When I run the program belwo, this is what I see for a domain error from cos():
>
> $ ./a.out inf
> errno == 0
> fetestexcept() says: 1 FE_INVALID
> cos(inf)=nan
Which is the correct behaviour for the exception AFAIK. Setting of
errno is indeed missing - if math_errhandling has the right value which
is unfortunately missing,
Andreas
--
Andreas Jaeger, Director Platform/openSUSE, aj@xxxxxxx
SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nürnberg)
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