-int _xcb_out_write(XCBConnection *c);
-int _xcb_out_write_block(XCBConnection *c, struct iovec *vector, size_t count);
-int _xcb_out_flush(XCBConnection *c);
+int _xcb_out_send(XCBConnection *c, struct iovec **vector, int *count);
+int _xcb_out_flush_to(XCBConnection *c, unsigned int request);