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List:       apache-modules
Subject:    Re: [apache-modules] fopen fails in Apache
From:       Joe Orton <jorton () redhat ! com>
Date:       2005-10-31 16:23:54
Message-ID: 20051031162354.GA31056 () redhat ! com
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On Fri, Oct 28, 2005 at 09:56:28AM +0100, Nick Kew wrote:
> On Friday 28 October 2005 09:22, Julien ALLANOS wrote:
> > Nick Kew a écrit :
> > > On Friday 28 October 2005 08:30, Julien ALLANOS wrote:
> > >>Check errno.
> > >
> > > If you ever do that, something *must* be wrong.  errno is not,
> > > in general, thread safe, so it has no place in an Apache module.
> >
> > Well, man errno
> 
> That'll be TFM for your platform
> 
> > says "errno is thread-local; setting it in one thread 
> > does not affect its value in any other thread.", though
> > http://httpd.apache.org/docs/2.0/developer/thread_safety.html#errno says
> > the opposite...
> 
> Apache is cross-platform, so can't make that kind of assumption.

It is very very safe to assume that errno is thread-local if threads are 
supported, none of the ANSI C library would work otherwise, and 
certainly not much of APR.

joe

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