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dev_clone(9)

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






















































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