Bug#339318: marked as done (Bug in fesetenv() [LIBC6.1])
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and subject line Bug#339318: Bug in fesetenv() [LIBC6.1]
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Subject: Bug in fesetenv() [LIBC6.1]
From: Juan Jose Garcia Ripoll <jlr@mpq.mpg.de>
To: submit@bugs.debian.org
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Date: Tue, 15 Nov 2005 14:49:57 +0100
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Package: libc6.1
Version: 2.2.5-11.5
Summary: Under some circumstances, invoking fesetenv() results
in a floating point exception being raised.
Description:
I have a piece of code which may result in underflows. I enclose
the code in between
fenv_t env;
feholdexcept(&env);
...
fesetenv(&env);
Now the code in [...] is reading floating point numbers which may
be very small and result in underflow floating point signals.
However, since we have used feholdexcept() the signals should not
be produced. And indeed they are not, until we reach fesetenv()
where the signal is raised.
If you read the manual of LIBC for fesetenv()
The fesetenv function restores the floating point environ-
ment from the object *envp. This object must be known to
be valid, e.g., the result of a call to fegetenv or
feholdexcept or equal to FE_DFL_ENV. This call does not
raise exceptions.
it says no exception should be raised.
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>From gotom@sanori.org Mon Dec 19 17:30:14 2005
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Tue, 20 Dec 2005 10:30:13 +0900 (JST)
Date: Tue, 20 Dec 2005 10:30:13 +0900
Message-ID: <818xugftcq.wl%gotom@sanori.org>
From: GOTO Masanori <gotom@sanori.org>
To: Juan Jose Garcia Ripoll <jlr@mpq.mpg.de>,
Daniel Jacobowitz <drow@false.org>, 339318-done@bugs.debian.org
Subject: Re: Bug#339318: Bug in fesetenv() [LIBC6.1]
In-Reply-To: <20051120170845.GB28243@nevyn.them.org>
References: <1132062597.30677.55.camel@mpq3p32.mpq.mpg.de>
<20051120170845.GB28243@nevyn.them.org>
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At Sun, 20 Nov 2005 12:08:45 -0500,
Daniel Jacobowitz wrote:
> On Tue, Nov 15, 2005 at 02:49:57PM +0100, Juan Jose Garcia Ripoll wrote:
> > Package: libc6.1
> > Version: 2.2.5-11.5
>
> That's a very old glibc version. It's likely that we can't help you
> with it. However, could you post a standalone testcase? Then we can
> at least check whether it is fixed in later versions.
I close this bug because there's no responce from the submitter.
Juan, if you still see your bugs in the recent glibc version (ex:
sarge or sid), please reopen this bug or just report it to us. It
seems you run on ia64 or alpha - so it probably the actual bug, but we
need to confirm the recent package has this kind of bugs in first.
Note that it's nice idea to attach a sample code in your bug report
because we hardly find what the problem is.
-- gotom
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