XmToggleButtonGadgetGetState(3) on Linux
The text a762a94cbc52, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
A ToggleButtonGadget function that obtains the state of a ToggleButtonGadget "XmToggleButtonGadgetGet\%State" "ToggleButtonGadget functions" "XmToggleButtonGadgetGet\%State"