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* [Bug math/6784] New: fmod() inconsistently sets errno on domain error
@ 2008-07-30 12:30 mtk dot manpages at gmail dot com
2008-07-31 8:47 ` [Bug math/6784] " mtk dot manpages at gmail dot com
2010-09-11 15:47 ` mtk dot manpages at gmail dot com
0 siblings, 2 replies; 3+ messages in thread
From: mtk dot manpages at gmail dot com @ 2008-07-30 12:30 UTC (permalink / raw)
To: glibc-bugs
The calls fmod(x, 0) and fmod(inf, y) should both result in a domain
error.
For both of these calls, an invalid exception is correctly raised.
However, errno is not set consistently. fmod(x, 0) does (correctly) set
errno to EDOM. However, fmod(inf, y) does not set errno; it should do so.
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: fmod() inconsistently sets errno on domain 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=6784
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* [Bug math/6784] fmod() inconsistently sets errno on domain error
2008-07-30 12:30 [Bug math/6784] New: fmod() inconsistently sets errno on domain error mtk dot manpages at gmail dot com
@ 2008-07-31 8:47 ` mtk dot manpages at gmail dot com
2010-09-11 15:47 ` mtk dot manpages at gmail dot com
1 sibling, 0 replies; 3+ messages in thread
From: mtk dot manpages at gmail dot com @ 2008-07-31 8:47 UTC (permalink / raw)
To: glibc-bugs
------- Additional Comments From mtk dot manpages at gmail dot com 2008-07-31 08:46 -------
Created an attachment (id=2849)
--> (http://sourceware.org/bugzilla/attachment.cgi?id=2849&action=view)
test program
See also http://sourceware.org/bugzilla/show_bug.cgi?id=6783
sample runs showing problem. Note that EDOM is set in one case, but not the
other.
$ /tmp/mt_fmod -- inf 1
errno == 0
fetestexcept() says: FE_INVALID
fmod(inf,1.00000000000000000e+00)=nan
0 FE_INVALID nan
$ /tmp/mt_fmod -- 1 0
errno == EDOM
fetestexcept() says: FE_INVALID
fmod(1.00000000000000000e+00,0.00000000000000000e+00)=nan
EDOM FE_INVALID nan
--
http://sourceware.org/bugzilla/show_bug.cgi?id=6784
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* [Bug math/6784] fmod() inconsistently sets errno on domain error
2008-07-30 12:30 [Bug math/6784] New: fmod() inconsistently sets errno on domain error mtk dot manpages at gmail dot com
2008-07-31 8:47 ` [Bug math/6784] " mtk dot manpages at gmail dot com
@ 2010-09-11 15:47 ` mtk dot manpages at gmail dot com
1 sibling, 0 replies; 3+ messages in thread
From: mtk dot manpages at gmail dot com @ 2010-09-11 15:47 UTC (permalink / raw)
To: glibc-bugs
------- Additional Comments From mtk dot manpages at gmail dot com 2010-09-11 15:47 -------
This bug was fixed in glibc 2.10. The man page is updated for man-pages-2.37.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
http://sourceware.org/bugzilla/show_bug.cgi?id=6784
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2008-07-30 12:30 [Bug math/6784] New: fmod() inconsistently sets errno on domain error mtk dot manpages at gmail dot com
2008-07-31 8:47 ` [Bug math/6784] " mtk dot manpages at gmail dot com
2010-09-11 15:47 ` mtk dot manpages at gmail dot com
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