On Thu, 17 May 2001, Warner Losh wrote:

> In message <[EMAIL PROTECTED]> Brian
> Somers writes:
> : Solaris calls it's ioctl files /usr/include/sys/<driver>_io.h so I'd
> : spell digiio.h /usr/include/sys/digi_io.h.
> Actually, the more I think about it, the more I like putting it in
> /usr/include/sys/fooio.h.  We have lots of other files there now.  The
> down side to this approach is that it breaks up the driver sources
> that we've been trying to concentrate into sys/dev/foo/* (or
> introduces asymetry such that you can't just toss in a -I/sys and have
> the same tree that gets stuck under /usr/include).

I quite like the fact that the programming interface <sys/fooio.h> is
separated from the driver implementation. There is less chance that the
driver writer will expose irrelavent implementation details in the API,
which in turn makes for a more stable ABI.

Doug Rabson                             Mail:  [EMAIL PROTECTED]
                                        Phone: +44 20 8348 6160

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