Calling network ioctl using alien

["jonsmirl@..." <jonsmirl@...>]

To get the hardware address I need to call ioctl on the socket handle.
ioctl is varargs, I can't figure how to get alien to call it.

   struct ifreq ifinfo;
   strcpy(ifinfo.ifr_name, "eth0");
   int sd = socket(AF_INET, SOCK_DGRAM, 0);

local s = socket.udp()
looking at the source for socket, the first int in the s structure is
the socket handle.

   int result = ioctl(sd, SIOCGIFHWADDR, &ifinfo);

How do I make this call using alien?   int ioctl(int d, int request, ...);

   close(sd);

   if ((result == 0) && (ifinfo.ifr_hwaddr.sa_family == 1)) {
       memcpy(mac_addr, ifinfo.ifr_hwaddr.sa_data, IFHWADDRLEN);
       return true;
   }
   return false;

-- 
Jon Smirl
jonsmirl@gmail.com