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Date:	Mon, 15 Jun 2009 11:22:12 +0200
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Subject:	Re: ioctl(sock, SIOCGIFHWADDR, &ifr) fails with 1.7
From:	=?UTF-8?B?RnLDqWTDqXJpYyBCcm9u?= <frederic DOT bron AT m4x DOT org>
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> To fix your application, call either
>
> =C2=A0struct ifconf ifc;
> =C2=A0ifc.ifc_len =3D sizeof (struct ifreq) * 32;
> =C2=A0ifc.ifc_buf =3D malloc (ifc.ifc_len);
> =C2=A0if (ioctl (fd, SIOCGIFCONF, &ifc))
> =C2=A0 =C2=A0/* Resize ifc_buf and retry */
> =C2=A0else
> =C2=A0 =C2=A0{
> =C2=A0 =C2=A0 =C2=A0struct ifreq *ifr =3D ifc.ifc_req;
> =C2=A0 =C2=A0 =C2=A0struct ifreq ifr2;
> =C2=A0 =C2=A0 =C2=A0for (int i =3D 0; i < ifc.ifc_len; i +=3D sizeof (str=
uct ifreq), ++ifr)
> =C2=A0 =C2=A0 =C2=A0 =C2=A0if (!ioctl (fd, SIOCGIFADDR, &ifr2))
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0/* Print result for that interface */
> =C2=A0 =C2=A0}

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 !=3D 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?

Fr=C3=A9d=C3=A9ric

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