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DEV_CLONE(9)		 BSD Kernel Developer's	Manual		  DEV_CLONE(9)

NAME
     dev_clone,	drain_dev_clone_events -- eventhandler for name-based device
     cloning in	devfs

SYNOPSIS
     #include <sys/param.h>
     #include <sys/conf.h>

     void
     clone_handler(void	*arg, struct ucred *cr,	char *name, int	namelen,
	 struct	cdev **dev);

     EVENTHANDLER_REGISTER(dev_clone, clone_handler, arg, priority);

     void
     drain_dev_clone_events();

DESCRIPTION
     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 lis-
     tener shall be registered for the dev_clone event.	 When called, it is
     supplied with the first argument arg that was specified at	handler	regis-
     tration time, appropriate credentials cr, and a name name of length
     namelen 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 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.

SEE ALSO
     devfs(5), namei(9)

BSD				January	3, 2009				   BSD

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO

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