SIOCGIFFLAGS fails loopback interface

When I call ioctl() with SIOCGIFFLAGS for interface "lo" (loopback) it
fails.

strerror() says: No such device

The same code works for normal intefaces (ethX). Any ideas why this is so?

The reason I need this is to test whether the interface is multicast-capable
(flag IFF_MULTICAST).

Alexandros Karypidis <(E-Mail Removed)> wrote:
>When I call ioctl() with SIOCGIFFLAGS for interface "lo" (loopback) it
>fails.
>
>strerror() says: No such device
>
>The same code works for normal intefaces (ethX). Any ideas why this is so?

Your code has a bug.

>The reason I need this is to test whether the interface is multicast-capable
>(flag IFF_MULTICAST).

--
FloydL. Davidson <http://web.newsguy.com/floyd_davidson>
Ukpeagvik (Barrow, Alaska) (E-Mail Removed)