Re: upcalls from kernel code to user space daemons

[Chris Friesen]

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().

Chris
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