ioctl(sock, SIOCGIFHWADDR, &ifr) fails with 1.7

[Frédéric Bron]

> To fix your application, call either
>
>  struct ifconf ifc;
>  ifc.ifc_len = sizeof (struct ifreq) * 32;
>  ifc.ifc_buf = malloc (ifc.ifc_len);
>  if (ioctl (fd, SIOCGIFCONF, &ifc))
>    /* Resize ifc_buf and retry */
>  else
>    {
>      struct ifreq *ifr = ifc.ifc_req;
>      struct ifreq ifr2;
>      for (int i = 0; i < ifc.ifc_len; i += sizeof (struct ifreq), ++ifr)
>        if (!ioctl (fd, SIOCGIFADDR, &ifr2))
>          /* Print result for that interface */
>    }

Thanks, this works half! No need of ifr2, ifr is enough.
I saw the name change: 1.5 gives eth0, eth1, eth2, lo and 1.7 gives
{821C54BE-...}...

However, with that code, I get all network adapters with cygwin 1.5
but only active adpaters with 1.7 (with IP adress != 0).
For example if I unplug the ethernet wire, the ip of eth0 becomes
0.0.0.0 with 1.5 and I don't see it anymore with 1.7.

How can I get all interfaces with 1.7?

Frédéric

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