[Bug math/6799] New: nextafter() and nexttoward() doen't set errno on error

[Bug math/6799] New: nextafter() and nexttoward() doen't set errno on error

[mtk dot manpages at gmail dot com]

On overflow and underflow, nextafter() and nexttoward() correctly raise an
exception.  But errno is not set for these cases.  errno should be set to ERANGE.


Background: 
On error, many glibc math functions both set errno and raise an exception
(fetestexcept(3)).  For example, the following  function all do this: acos(),
asin(), cosh(), sinh(), acosh(), asinh(), exp(), exp2(), ldexp(), log(),
log10(), log2().  However, there is much inconsistency.  Some functions raise an
exception, but don't set errno.  Some functions set errno for some errors, but
not others.  A few set errno, but don't raise an exception.  This series of bug
reports documents deviations from what I consider the ideal: all functions
should BOTH set errno AND raise an exception for all errors.

All of these reports relate to tests on glibc 2.8 (as provided by SUSE 11.0).

-- 
           Summary: nextafter() and nexttoward() doen't set errno on error
           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=6799

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[Bug math/6799] nextafter() and nexttoward() doen't set errno on overflow error

[mtk dot manpages at gmail dot com]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|nextafter() and nexttoward()|nextafter() and nexttoward()
                   |doen't set errno on error   |doen't set errno on overflow
                   |                            |error


http://sourceware.org/bugzilla/show_bug.cgi?id=6799

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[Bug math/6799] nextafter() and nexttoward() doen't set errno on overflow error

[mtk dot manpages at gmail dot com]

------- Additional Comments From mtk dot manpages at gmail dot com  2008-07-31 10:34 -------
Created an attachment (id=2863)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=2863&action=view)
test program


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http://sourceware.org/bugzilla/show_bug.cgi?id=6799

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[Bug math/6799] nextafter() and nexttoward() doen't set errno on overflow/underflow errors

[mtk dot manpages at gmail dot com]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|nextafter() and nexttoward()|nextafter() and nexttoward()
                   |doen't set errno on overflow|doen't set errno on
                   |error                       |overflow/underflow errors


http://sourceware.org/bugzilla/show_bug.cgi?id=6799

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[Bug math/6799] nextafter() and nexttoward() doen't set errno on overflow error

[mtk dot manpages at gmail dot com]

------- Additional Comments From mtk dot manpages at gmail dot com  2008-07-31 10:36 -------
Created an attachment (id=2864)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=2864&action=view)
test program


-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=6799

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[Bug math/6799] nextafter() and nexttoward() doen't set errno on overflow/underflow errors

[mtk dot manpages at gmail dot com]

------- Additional Comments From mtk dot manpages at gmail dot com  2008-07-31 10:42 -------
Sample runs demonstrating the problem:

$ /tmp/mt_nextafter dbl_max inf
errno == 0
fetestexcept() says:  FE_OVERFLOW FE_INEXACT
nextafter(1.79769313486231571e+308,inf)=inf
0 FE_OVERFLOW +inf

$ /tmp/mt_nextafter dbl_min 0
errno == 0
fetestexcept() says:  FE_UNDERFLOW FE_INEXACT
nextafter(2.22507385850720138e-308,0.00000000000000000e+00)=2.22507385850720089e-308
0 FE_UNDERFLOW subnormal

$ /tmp/mt_nexttoward dbl_max inf
errno == 0
fetestexcept() says:  FE_OVERFLOW FE_INEXACT
nexttoward(1.79769313486231571e+308,inf)=inf
0 FE_OVERFLOW +inf

$ /tmp/mt_nexttoward  dbl_min 0
errno == 0
fetestexcept() says:  FE_UNDERFLOW FE_INEXACT
nexttoward(2.22507385850720138e-308,0.000000000000000000000000000000000000e+00)=2.22507385850720089e-308
0 FE_UNDERFLOW subnormal


-- 


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