aquamacs

The function to show current file's full path in mini buffer.

I need to get the full path of the file that I'm editing with emacs. Is there a function for that? If not, what would be the elisp function for getting that? How can I copy the result (path name) to a clipboard so that I can reuse it? I'm using Mac OS X and Aqumacs. (setq filepath (get-fullpath-current-file)) ??? (copy-to-clipboard...