-extern int setup_listen_socket(const sockaddr_t *);
-extern int setup_vpn_in_socket(struct meshlink_handle *mesh, const sockaddr_t *);
-extern bool send_sptps_data(void *handle, uint8_t type, const char *data, size_t len);
-extern bool receive_sptps_record(void *handle, uint8_t type, const char *data, uint16_t len);
+extern bool setup_listen_socket(struct meshlink_handle *mesh, int fd, int sa_family) __attribute__((__warn_unused_result__));
+extern bool setup_vpn_in_socket(struct meshlink_handle *mesh, int fd, int sa_family) __attribute__((__warn_unused_result__));
+extern bool send_sptps_data(void *handle, uint8_t type, const void *data, size_t len);
+extern bool receive_sptps_record(void *handle, uint8_t type, const void *data, uint16_t len) __attribute__((__warn_unused_result__));