Re: math_error.7 draft 4, for review

["Michael Kerrisk" <mtk.manpages-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>]

On Fri, Jul 25, 2008 at 12:02 PM, Andreas Jaeger <aj-Et1tbQHTxzrQT0dZR+AlfA@public.gmane.org> wrote:
> "Michael Kerrisk" <mtk.manpages-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org> writes:
>
>> On Fri, Jul 25, 2008 at 11:30 AM, Andreas Jaeger <aj-Et1tbQHTxzrQT0dZR+AlfA@public.gmane.org> wrote:
>>> "Michael Kerrisk" <mtk.manpages-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org> writes:
>>>
>>>> [CC+= Andries]
>>>>
>>>> On Mon, Jul 21, 2008 at 12:23 PM, Michael Kerrisk
>>>> <mtk.manpages-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org> wrote:
>>>>> [Ooops -- wrong list CCed on previous mail; and this time, I'll update
>>>>> the draft number]
>>>>>
>>>>> Andreas,
>>>>>
>>>>> The latest version of the page is below.
>>>
>>> This one looked ok to me,
>>
>> Thanks Andreas.
>>
>> So I've been testing all of the math functions lately (on glibc 2.8),
>> and I discover the following:
>>
>> a) on error, many functions set errno AND raise an exception (fetestexcept()).
>> b) on error, a few functions set errno but DON"T raise an exception
>> (fetestexcept()).
>> c) on error, a few functions DON'T set errno BUT DO raise an exception
>> (fetestexcept()).
>> d) on error, a very few functions pursue a mixture of all of the
>> above, depending on the error.
>>
>> My math_error.7 page currently implies that all functions should do
>> a).  Clearly I'll need to amend that.
>>
>> But the main question is, should I raise a pile of glibc bugs for the
>> functions in cases b), c), and d)?
>
> I suggest to discuss on the libc-alpha mailing list first.

Okay -- I have done so.

> We have not done the exception handling properly.  errno setting should
> be correct, we have tests for these,

Well, for example, according to my tests, cos(3) does not set errno.
Is that what you would have expected?

-- 
Michael Kerrisk
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