if_nameindex
struct if_nameindex* if_nameindex(void);
void if_freenameindex(struct if_nameindex* interfaceArray);
struct if_nameindex* interfaceArray = (struct if_nameindex*)malloc(
sizeof(struct if_nameindex) * (count + 1));
if_freenameindex(struct if_nameindex *interfaceArray)
struct if_nameindex*
ifs = if_nameindex();
struct if_nameindex* ifs;