Interface friendly names for AF_INET6

Corinna Vinschen
Thu Mar 10 13:32:00 GMT 2016

Hi Marco,

On Mar 10 12:10, Marco Atzeri wrote:
> I am trying to put a small interface info tool
> to debug some hangs reported on openmpi.
> The aim is to produce something like
> {9F4F7FD2-5E44-4796-ABE0-0785CF76C11E} AF_INET6 (23)
>         flags: up running multicast
>         address: <fe80::9953:b1f5:a643:4497%15>
>         Local Area Connection
> {9F4F7FD2-5E44-4796-ABE0-0785CF76C11E} AF_INET (2)
>         flags: up broadcast running multicast
>         address: <>
>         Local Area Connection
> I am using getifaddrs to obtain all the AF_INET and AF_INET6
> interface, however I can only obtain the friendly name of the
> AF_INET using
>   ioctl(sock, SIOCGIFFRNDLYNAM

getifaddrs should return the friendly name.  Strruct ifall
has a member ifa_frndlyname, type struct ifreq_frndlyname,
which is filled for AF_INET and AF_INET6 interfaces.

> On my pc I see 20 interface, 10 for each type, however
> only 7 couples shares the same "ifa_name" the others
> 3+3 shows different ones.
> Any alternative to ioctl(sock, SIOCGIFFRNDLYNAM
>  for AF_INET6 ?

I don't quite understand the question.  Are you saying that
ioctl(sock, SIOCGIFFRNDLYNAM) doesn't work for AF_INET6 sockets?


Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat
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