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[Bug math/6786] New: erfc() does not set errno for underflow
- From: "mtk dot manpages at gmail dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: 30 Jul 2008 14:52:55 -0000
- Subject: [Bug math/6786] New: erfc() does not set errno for underflow
- Reply-to: sourceware-bugzilla at sourceware dot org
When erfc() is given an argument that causes underflow (e.g., erfc(106.9) on
x8632) it raises an underflow exception. However, errno is not set. It should
be set to ERANGE for this case.
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: erfc() does not set errno for underflow
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=6786
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