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Date: Thu, 16 Sep 2004 10:47:02 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: checking for working mmap...no
Message-ID: <20040916084702.GA29191@cygbert.vinschen.de>
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On Sep 15 18:33, Sam Steingold wrote:
> > * Christopher Faylor <pts-ab-crefbany-ercyl-cyrnfr AT pltjva DOT pbz> [2004-09-15 17:07:51 -0400]:
> >
> > On Wed, Sep 15, 2004 at 03:20:50PM -0400, Sam Steingold wrote:
> >>It appears that cygwin mmap() is lacking:
> >>
> >>configure:20536: checking for working mmap
> >>configure:20617: gcc -o conftest.exe -g -O2 conftest.c  >&5
> >>configure:20620: $? = 0
> >>configure:20622: ./conftest.exe
> >>configure:20625: $? = 1
> >>configure: program exited with status 1
> >>configure: failed program was:
> >
> > It would be enormously helpful if you apprised us of exactly *what*
> > was wrong rather than expecting us to figure it out.
> 
> Let me assure you that you know these matters much better than I do.
> 
> The C program in my original e-mail is supposed to terminate with exit
> code 0 if mmap() works correctly.  It does, e.g., on Linux and Solaris.
> 
> On cygwin, it terminates with exit code 1, which indicates that mmap()
> does not work correctly as it is supposed to according to the spec.
> 
> Unfortunately, I am far from being an expert on these matters...

The mmap test is crap.  How can an application expect to be able to
access just about every address together with MAP_FIXED?

Consequentially MapViewOfFileEx returns error 487 in these cases,
"Attempt to access invalid address."

That's just another example of a crappy autoconf mmap test.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          mailto:cygwin AT cygwin DOT com
Red Hat, Inc.

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