Function xc_get_device_group 

pub unsafe extern "C" fn xc_get_device_group(
    xch: *mut xc_interface,
    domid: u32,
    machine_sbdf: u32,
    max_sdevs: u32,
    num_sdevs: *mut u32,
    sdev_array: *mut u32,
) -> c_int