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From Joe Orton <...@manyfish.co.uk>
Subject Re: mmap bug?
Date Thu, 27 Feb 2003 22:41:54 GMT
On Thu, Feb 27, 2003 at 05:10:53PM -0500, Garrett Rooney wrote:
> Joe Orton wrote:
> >>From a quick check, unless I'm screwing something up, it appears that
> >passing a zero length argument to mmap() doesn't work on several
> >platforms (nor does it make a whole lot of sense ;): Solaris and HP-UX
> >both return EINVAL from the the mmap call...
> >
> >I'll ask our kernel guys about the Linux case, though I'd guess they'll
> >say it's undefined behaviour.
> > 
> >
> 
> well, in any case, we should define how it will behave in APR, and stick 
> to it no matter what the underlying platform allows.  either it should 
> always pass or always succeed (and return an arbitrary pointer or 
> something).  this is just the kind of os dependent behavior APR should 
> be letting you ignore.

Or maybe just document the APR behavior to be undefined if length=0 and
don't fudge around doing argument validity checking, since creating a
zero-length mmap isn't a particularly useful feature and supporting it
adds code complexity.

joe

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