extern int afb_xreq_subscribe(struct afb_xreq *xreq, struct afb_event event);
extern int afb_xreq_unsubscribe(struct afb_xreq *xreq, struct afb_event event);
extern void afb_xreq_subcall(struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *cb_closure);
extern int afb_xreq_subscribe(struct afb_xreq *xreq, struct afb_event event);
extern int afb_xreq_unsubscribe(struct afb_xreq *xreq, struct afb_event event);
extern void afb_xreq_subcall(struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *cb_closure);