A device driver may register a listener that will be notified each time
a name lookup on the
devfs(5)
mount point fails to find the vnode.
A listener shall be registered for the
dev_clone
event.
When called, it is supplied with the first argument
arg
that was specified at handler registration time,
appropriate credentials
cr,
and a name
name
of length
namelen
that we look for.
If the handler decides that the name is appropriate and wants to create the device
that will be associated with the name, it should return it to devfs
in the
dev
argument.
The
drain_dev_clone_events()
function is a barrier.
It is guaranteed that all calls to eventhandlers for
dev_clone
that were started before
drain_dev_clone_events()
call, are finished before it returns control.
