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* [Bug math/6796] New: fdim() does not set errno on overflow
@ 2008-07-31 10:06 mtk dot manpages at gmail dot com
2008-07-31 10:08 ` [Bug math/6796] " mtk dot manpages at gmail dot com
0 siblings, 1 reply; 2+ messages in thread
From: mtk dot manpages at gmail dot com @ 2008-07-31 10:06 UTC (permalink / raw)
To: glibc-bugs
On overflow, fdim() correctly raises an exception, but does not set errno.
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: fdim() does not set errno on overflow
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=6796
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* [Bug math/6796] fdim() does not set errno on overflow
2008-07-31 10:06 [Bug math/6796] New: fdim() does not set errno on overflow mtk dot manpages at gmail dot com
@ 2008-07-31 10:08 ` mtk dot manpages at gmail dot com
0 siblings, 0 replies; 2+ messages in thread
From: mtk dot manpages at gmail dot com @ 2008-07-31 10:08 UTC (permalink / raw)
To: glibc-bugs
------- Additional Comments From mtk dot manpages at gmail dot com 2008-07-31 10:07 -------
Created an attachment (id=2858)
--> (http://sourceware.org/bugzilla/attachment.cgi?id=2858&action=view)
test program
Sample run demonstrating the problem
$ /tmp/mt_fdim -- dbl_max -dbl_max
errno == 0
fetestexcept() says: FE_OVERFLOW FE_INEXACT
fdim(1.79769313486231571e+308,-1.79769313486231571e+308)=inf
0 FE_OVERFLOW +inf
--
http://sourceware.org/bugzilla/show_bug.cgi?id=6796
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2008-07-31 10:06 [Bug math/6796] New: fdim() does not set errno on overflow mtk dot manpages at gmail dot com
2008-07-31 10:08 ` [Bug math/6796] " mtk dot manpages at gmail dot com
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