gtk:page-setup-paper-size (setup)

setup -- a gtk:page-setup object
size -- a gtk:paper-size instance

The gtk:page-setup-paper-size function gets the paper size of the page setup object. The (setf gtk:page-setup-paper-size) function sets the paper size without changing the margins. See also the gtk:page-setup-set-paper-size-and-default-margins function.