cvs-get-marked is a compiled Lisp function in `pcvs.el'.

(cvs-get-marked &optional IGNORE-MARKS IGNORE-CONTENTS)

Return a list of all selected fileinfos.
If there are any marked tins, and IGNORE-MARKS is nil, return them.
Otherwise, if the cursor selects a directory, and IGNORE-CONTENTS is
nil, return all files in it, else return just the directory.
Otherwise return (a list containing) the file the cursor points to, or
an empty list if it doesn't point to a file at all.