SCNetworkReachabilitySetCallback

system_configuration_sys::network_reachability

Function SCNetworkReachabilitySetCallback 

Source 
pub unsafe extern "C" fn SCNetworkReachabilitySetCallback(
    target: SCNetworkReachabilityRef,
    callout: SCNetworkReachabilityCallBack,
    context: *mut SCNetworkReachabilityContext,
) -> Boolean