It's zlist_dup() and you would not use recursion to process these types of lists. The API is designed for iteration. One case for recursion is when you use list

It's zlist_dup() and you would not use recursion to process these types of lists. The API is designed for iteration. One case for recursion is when you use lists of lists of lists... you can then process such structures recursively. See zconfig for examples of that.