[Bug math/6777] New: lgamma() pole error sets errno to EDOM, should be ERANGE

[Bug math/6777] New: lgamma() pole error sets errno to EDOM, should be ERANGE

[mtk dot manpages at gmail dot com]

For the pole error, POSIX.1 says of lgamma():

Pole Error
    The x argument is a negative integer or zero.

    If the integer expression (math_errhandling & MATH_ERRNO) is non-zero, then
errno shall be set to [ERANGE]. If the integer expression (math_errhandling &
MATH_ERREXCEPT) is non-zero, then the divide-by-zero floating-point exception
shall be raised.
==

glibc 2.8's lgamma() does raise the divide-by-zero exception, as expected.

It also sets errno, but to the wrong value: errno is set to EDOM, when it should
instead be ERANGE.

-- 
           Summary: lgamma() pole error sets errno to EDOM, should be ERANGE
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
        AssignedTo: aj at suse dot de
        ReportedBy: mtk dot manpages at gmail dot com
                CC: glibc-bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=6777

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[Bug math/6777] lgamma() pole error sets errno to EDOM, should be ERANGE

[mtk dot manpages at gmail dot com]

------- Additional Comments From mtk dot manpages at gmail dot com  2008-07-31 08:25 -------
Created an attachment (id=2842)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=2842&action=view)
test program

Attached a test program.  Sample run showing the problem:

$ /tmp/mt_lgamma -- -1
errno == EDOM
fetestexcept() says:  FE_DIVBYZERO
lgamma(-1.00000000000000000e+00)=inf
EDOM FE_DIVBYZERO +inf


-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=6777

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[Bug math/6777] lgamma() pole error sets errno to EDOM, should be ERANGE

[mtk dot manpages at gmail dot com]

------- Additional Comments From mtk dot manpages at gmail dot com  2010-09-11 14:21 -------
This bug appears to have been fixed in glibc 2.10, and man-pages-3.27 is updated
accordingly.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED


http://sourceware.org/bugzilla/show_bug.cgi?id=6777

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