Function libsystemd_sys::bus::sd_bus_request_name_async

pub unsafe extern "C" fn sd_bus_request_name_async(
    bus: *mut sd_bus, 
    ret_slot: *mut *mut sd_bus_slot, 
    name: *const c_char, 
    flags: u64, 
    callback: sd_bus_message_handler_t, 
    userdata: *mut c_void
) -> c_int