XmScrollBarGetValues(3) on Linux
The text 68ee9cabbb2e, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
A ScrollBar function that returns the ScrollBar's increment values "XmScrollBarGetValues" "ScrollBar functions" "XmScrollBarGetValues"