Hi Will,
On 10/29/2014 01:18 PM, Will Newton wrote:
> Hi,
>
> The ilogb manpage currently claims that errno is not set on error:
>
> Domain error: x is 0 or a NaN
> An invalid floating-point exception (FE_INVALID) is raised.
>
> These functions do not set errno for this case.
>
> Domain error: x is an infinity
>
> These functions do not set errno or raise an exception
> for this case.
>
> However this is at odds with the ISO C standard an the most recent glibc code:
>
> int
> __ilogb (double x)
> {
> int r = __ieee754_ilogb (x);
> if (__builtin_expect (r == FP_ILOGB0, 0)
> || __builtin_expect (r == FP_ILOGBNAN, 0)
> || __builtin_expect (r == INT_MAX, 0))
> {
> __set_errno (EDOM);
> feraiseexcept (FE_INVALID);
> }
> return r;
> }
Thanks for the report. Things were fixed in glibc 2.16
( https://www.sourceware.org/bugzilla/show_bug.cgi?id=6794 )
and I've now updated the man page.
Cheers,
Michael
--
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
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