NET_PROTOCOL_NOTIFY_REGISTER(9F) Kernel Functions for Drivers

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

illumos DDI specific (illumos 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(7) for descriptions of the following attributes:


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

SEE ALSO

attributes(7), net_protocol_lookup(9F)

October 30, 2008
NET_PROTOCOL_NOTIFY_REGISTER(9F)