Function SoapySDRDevice_listTimeSources 

pub unsafe extern "C" fn SoapySDRDevice_listTimeSources(
    device: *const SoapySDRDevice,
    length: *mut usize,
) -> *mut *mut c_char

Get the list of available time sources.

\param device a pointer to a device instance \param [out] length the number of sources \return a list of time source names