Kqueue write event position?

[Vlad Galu]

On 11/22/06, Ivan Voras <ivoras at fer.hr> wrote:
> >From the kqueue(2) manual:
>
> """
>      EVFILT_VNODE   Takes a file descriptor as the identifier and the events
>                     to watch for in fflags, and returns when one or more of
>                     the requested events occurs on the descriptor.  The
> events
>                     to monitor are:...
> """
>
> I'm interested in NOTE_WRITE, but is there a way to find out where has
> the write been performed (position and length)? If not, how difficult
> would it be to expand the API so this information is included?
>

   It seems to me you would have to propagate that info along the
VOP_WRITE_POST->VFS_KNOTE_LOCKED->VN_KNOTE->knote() chain. Since
knote() is generic and is used for all types of notifications, you can
probably roll down your own replacement and call it from VN_KNOTE. Of
course, there probably is a better way :)


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