net_protocol_notify_register(9F)			   Kernel Functions for Drivers 			  net_protocol_notify_register(9F)

NAME

       net_protocol_notify_register, net_instance_protocol_unregister - add/delete a function to be called for changes to a protocol

SYNOPSIS

       #include <sys/hook.h>
       #include <sys/neti.h>

       int net_protocol_notify_register(net_handle_t family,
	    hook_notify_fn_t *callback, void *arg);

       int net_protocol_notify_unregister(net_handle_t family,
	    hook_notify_fn_t *callback);

       typedef int (* hook_notify_fn_t)(hook_notify_cmd_t command,
	    void *arg, const char *name1, const char *name2, const char
	    *name3);

INTERFACE LEVEL

       Solaris DDI specific (Solaris DDI).

PARAMETERS

       family	   value returned from net_protocol_lookup().

       callback    function to call when a change occurs.

       arg	   pointer to pass into the callback() function when a change occurs.

DESCRIPTION

       The net_protocol_notify_register() function registers a function represented by the pointer callback to be called when there is a change to
       the protocol represented by family. The types of changes for which notifications are available for is currently limited to the addition and
       removal of protocols.

       The  net_protocol_notify_unregister()  function	removes the function specified by the pointer callback from the list of functions to call.
       This call may fail if the specified function cannot be found.

       Multiple callback functions may be registered through this interface. The same set of parameters is passed to each callback  function.  The
       memory  referenced  through  the  pointers  passed to the callback should be treated as pointing to read-only memory. Changing this data is
       strictly prohibited.

       The function that is called must not block any other protocols.

       The arguments passed through to the callback are as follows (the command is either HN_REGISTER or HN_UNREGISTER):

       name1	is the name of the protocol

       name2	is NULL.

       name3	is the name of the protocol being added/removed

RETURN VALUES

       If these functions succeed, 0 is returned. Otherwise, the following error is returned:

       EEXIST	 the given callback function is already registered.

CONTEXT

       These functions may be called from user or kernel context.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5), net_protocol_lookup(9F)

SunOS 5.11							    30 Oct 2008 				  net_protocol_notify_register(9F)