net_hook_register - add a hook to be called in event processing
int net_hook_register(net_handle_t info, char *event, hook_t *hook);
illumos DDI specific (illumos DDI).
value returned from a successful call to
unique name for this hook.
pointer to a hook_t structure.
The net_hook_register() function uses hooks that allow callbacks to be
registered with events that belong to a network protocol. A successful call to
net_hook_register() requires that a valid handle for a network protocol
be provided (the info parameter), along with a unique name and a hook
description that includes a reference to an available event. No two hooks on
the same netstack may share a name.
While it is possible to use the same hook_t structure with
multiple calls to net_hook_register(), it is not encouraged.
The hook_t structure passed in with this function is
described by hook_t(9S). The following describes how this structure
Must be non-NULL and represent a function that fits the
Gives the hook a name that represents its owner. No
duplication of h_name among the hooks present for an event is
Currently unused and must be set to 0.
Specify a hint to net_hook_register() on how to
insert this hook. If the hint cannot be specified, then an error is
May take any value that the consumer wishes to have
passed back when the hook is activated.
If the net_hook_register() function succeeds, 0 is returned. Otherwise,
one of the following errors is returned:
The system cannot allocate any more memory to support
registering this hook.
A hook cannot be found among the given family of
A hook with the given h_name already exists on
A before or after dependency cannot be satisfied due to
the hook with
The h_hint field specifies a hint that cannot
currently be satisfied because it conflicts with another hook. An example of
this might be specifying HH_FIRST or HH_LAST when another hook
has already been registered with this value.
The net_hook_register() function may be called from user or kernel
See attributes(7) for descriptions of the following attributes:
The netstack corresponding to info
is condemned or
no longer exists.