There's a command can output the defautl interface name like this:
$route -n get default
route to: default
destination: default
mask: default
gateway: 169.38.24.11
interface: en0
flags: <UP,GATEWAY,DONE,STATIC,PRCLONING>
recvpipe sendpipe ssthresh rtt,msec rttvar hopcount mtu expire
0 0 0 0 0 0 1500 0
I want to know if there's API in macOS xcode/SDK to get the interface name: en0 in below output?