Function sioul_new_application 

pub(crate) unsafe extern "C" fn sioul_new_application(
    count: i32,
    values: *const *const c_char,
) -> *mut c_void

On a computer, Sioul’s application, a widgets application (cpp/application.cpp): the system tray’s menu is made of widgets on Plasma. values holds count C strings, the program’s arguments, which it copies; made with new.