flk_invoke_callbacks
(void) flk_invoke_callbacks(flcb, FLK_BEFORE_SLEEP);
(void) flk_invoke_callbacks(flcb, FLK_AFTER_SLEEP);
cprp = flk_invoke_callbacks(request->l_callbacks,
(void) flk_invoke_callbacks(request->l_callbacks,
callb_cpr_t *flk_invoke_callbacks(flk_callback_t *, flk_cb_when_t);