extern kern_return_t ipc_importance_task_hold_legacy_external_assertion(ipc_importance_task_t task_imp, uint32_t count);
extern kern_return_t ipc_importance_task_drop_legacy_external_assertion(ipc_importance_task_t task_imp, uint32_t count);
+extern boolean_t ipc_importance_check_circularity(ipc_port_t port, ipc_port_t dest);
+
/* prepare importance attributes for sending */
extern boolean_t ipc_importance_send(
ipc_kmsg_t kmsg,