[haiku-development] Re: Ticket #2617 seekdir and telldir not implemented
- From: "Axel Dörfler" <axeld@xxxxxxxxxxxxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Tue, 19 Aug 2008 18:13:58 +0200 CEST
"Rene Gollent" <anevilyak@xxxxxxxxx> wrote:
> On Tue, Aug 19, 2008 at 2:48 AM, Salvatore Benedetto <
> emitrax@xxxxxxxxx> wrote:
> > In doubts, you can always "get inspired" ;-) by others
> > implementation,
> > like openbsd or opensolaris
> The problem is that's not all that helpful since the implementation
> of
> seekdir/telldir by definition depends partly on how your filesystems
> handle directory ordering, which is why the opengroup specs are quite
> vague on expected behavior. In this case it's a bit non-trivial since
> readdir() grabs a chunk from the kernel and then caches that in the
> __DIR struct until it runs out of entries to loop through, and as
> such
> seekdir/telldir would have to be able to determine not only the index
> of the current chunk, but also which chunk. At the moment I don't
> easily see how to get enough information to do that.
If needed we could extent the DIR structure to have all the info
necessary.
Bye,
Axel.
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