*
* Establishes for the client link identified by 'req' a subscription
* to the 'event'.
+ * Establishing subscriptions MUST be called BEFORE replying to the request.
* Returns 0 in case of successful subscription or -1 in case of error.
*/
static inline int afb_req_x1_subscribe(struct afb_req_x1 req, struct afb_event_x1 event)
*
* Revokes the subscription established to the 'event' for the client
* link identified by 'req'.
+ * Revoking subscription MUST be called BEFORE replying to the request.
* Returns 0 in case of successful subscription or -1 in case of error.
*/
static inline int afb_req_x1_unsubscribe(struct afb_req_x1 req, struct afb_event_x1 event)