svn commit: r216134 - in head: share/man/man9 sys/amd64/include sys/arm/include sys/i386/include sys/ia64/include sys/mips/include sys/pc98/include sys/powerpc/include sys/sparc64/include sys/sun4v...

John Baldwin jhb at
Fri Dec 3 17:07:18 UTC 2010

On Friday, December 03, 2010 9:41:03 am Bruce Cran wrote:
> On Fri, 3 Dec 2010 15:27:13 +0100
> Ivan Voras <ivoras at> wrote:
> > I'd say it depends on if the "specific case that hps raised a few
> > years ago" sentence part refers to an actual problem; i.e. did it
> > happen in practice? If yes, leaving KASSERTs looks like the best
> > option.
> I've found hps's original email thread, which is at
> .
> The argument for allowing zero-length reads/writes is at
> .
> I suspect the mistake occurred due to a misunderstanding of the API.
> NetBSD have documented it in their man page but not added asserts in
> the code:
> "Functions which take a count of bytes have undefined results if the
> specified count is zero."

I think that is excellent wording and that this case is actually very

John Baldwin

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