/**
* Returns the NetworkInterface corresponding to the given interface index, or null if no
* interface has this index.
*
* @throws SocketException if an error occurs.
* @since 1.7
*/
public static NetworkInterface getByIndex(int index) throws SocketException {
String name = Libcore.os.if_indextoname(index);
if (name == null) {
return null;
}
return NetworkInterface.getByName(name);
}
private static List<NetworkInterface> getNetworkInterfacesList() throws SocketException {
String[] interfaceNames = getInterfaceNames();
NetworkInterface[] interfaces = new NetworkInterface[interfaceNames.length];
boolean[] done = new boolean[interfaces.length];
for (int i = 0; i < interfaceNames.length; ++i) {
interfaces[i] = NetworkInterface.getByName(interfaceNames[i]);
// readdir(2) and our stat(2), so mark interfaces that disappeared as 'done'.
if (interfaces[i] == null) {
done[i] = true;
}
}
List<NetworkInterface> result = new ArrayList<NetworkInterface>();
for (int counter = 0; counter < interfaces.length; counter++) {
// If this interface has been dealt with already, continue.
if (done[counter]) {
continue;
}
int counter2 = counter;
// Checks whether the following interfaces are children.
for (; counter2 < interfaces.length; counter2++) {
if (done[counter2]) {
continue;
}
if (interfaces[counter2].name.startsWith(interfaces[counter].name + ":")) {
interfaces[counter].children.add(interfaces[counter2]);
interfaces[counter2].parent = interfaces[counter];
interfaces[counter].addresses.addAll(interfaces[counter2].addresses);
done[counter2] = true;
}
}
result.add(interfaces[counter]);
done[counter] = true;
}
return result;
}