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SubjectRe: upcalls from kernel code to user space daemons
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On Mon, 2004-06-14 at 23:57, Chris Friesen wrote:
> Oliver Neukum wrote:
>
> > > userspace daemon loops on ioctl()
> > > kernel portion of ioctl call goes to sleep until something to do
> > > when needed, fill in data and return to userspace
> > > userspace does stuff, then passes data back down via ioctl()
> > > ioctl() puts userspace back to sleep and continues on with other work
> >
> > You could just as well implement an ordinary read()
>
> Not quite. The userspace is passing data down as well. I don't know how you'd
> do that with read().

For this you use write().

Bernd
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