gFileCreateReadwriteAsync(object, flags, io.priority, cancellable = NULL, callback, user.data = NULL)GFileGFileCreateFlagsGCancellable object, NULL to ignoreGAsyncReadyCallback to call when the request is satisfiedgFileCreateReadwrite which is
the synchronous version of this call.
When the operation is finished, callback will be called. You can then
call gFileCreateReadwriteFinish to get the result of the operation.
Since 2.22