Solaris DDI specific (Solaris DDI).
The hook_t data structure defines a callback that is to be inserted into a networking event. This data structure must be allocated with a call to hook_alloc() and released with a call to hook_free().
hook_func_t h_func; /* callback function to invoke */ char *h_name; /* unique name given to the hook */ int h_flags; hook_hint_t h_hint; /* insertion hint type */ uintptr_t h_hintvalue; /* used with h_hint */ void *h_arg; /* value to pass into h_func */ typedef int (*hook_func_t)(net_event_t token, hook_data_t info, void *);
Hook hints are hints that are used at the time of insertion and are not rules that enforce where a hook lives for its entire lifetime on an event. The valid values for the h_hint field are:
Insert the hook wherever convenient.
Place the hook first on the list of hooks.
Place the hook last on the list of hooks.
Place the hook before another hook on the list of hooks. The value in h_hintvalue must be a pointer to the name of another hook.
Place the hook after another hook on the list of hooks. The value in h_hintvalue must be a pointer to the name of another hook.
See attributes(5) for descriptions of the following attributes: