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Re: Report bugs for variations in error handling in math functions?
- From: "Michael Kerrisk" <mtk dot manpages at googlemail dot com>
- To: "Joseph S. Myers" <joseph at codesourcery dot com>
- Cc: "Michael Kerrisk" <mtk dot manpages at googlemail dot com>, libc-alpha at sourceware dot org, "Andreas Jaeger" <aj at novell dot com>, "Andries Brouwer" <Andries dot Brouwer at cwi dot nl>, linux-man at vger dot kernel dot org
- Date: Wed, 6 Aug 2008 11:27:55 +0200
- Subject: Re: Report bugs for variations in error handling in math functions?
- References: <cfd18e0f0807250314h5c063754gd672c04b2eeef2f6@mail.gmail.com> <Pine.LNX.4.64.0807251535040.7701@digraph.polyomino.org.uk> <4891C60A.5000103@gmail.com> <cfd18e0f0808032248l3f9d7ef4r2af2a989da4d9eb9@mail.gmail.com>
On Mon, Aug 4, 2008 at 7:48 AM, Michael Kerrisk
<mtk.manpages@googlemail.com> wrote:
> On Thu, Jul 31, 2008 at 4:02 PM, Michael Kerrisk
> <mtk.manpages@googlemail.com> wrote:
>>> I think the correct approach is to consider it a bug if functions do not
>>> set errno, or do not raise exceptions - that is, all of (b), (c) and (d) are
>>> bugs. This would allow math_errhandling to be MATH_ERRNO|MATH_ERREXCEPT
>>> unless translation units are compiled with options preventing this, and make
>>> the error handling options available consistent across the math.h functions
>>> supported by glibc. To conform with C99, at least one approach (errno or
>>> exceptions) must be consistently supported across all the functions, in any
>>> case.
>>
>> I've reported bugs for all of the non-conformances I found.
>
> What I really should have said here is "non-conformances and
> deviations from the/my ideal that all errors would be reported both
> via errno and exceptions". Anyway, one for the list:
>
> http://sources.redhat.com/bugzilla/show_bug.cgi?id=6814
A tabular summary of what I found is provided here:
http://linux-man-pages.blogspot.com/2008/08/math-functions-and-error-reporting.html
Cheers,
Michael
--
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
man-pages online: http://www.kernel.org/doc/man-pages/online_pages.html
Found a bug? http://www.kernel.org/doc/man-pages/reporting_bugs.html