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Date: Thu, 10 Mar 2016 14:49:03 +0100
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: Interface friendly names for AF_INET6
Message-ID: <20160310134903.GC27354@calimero.vinschen.de>
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References: <56E15638.5080906@gmail.com> <20160310133223.GB27354@calimero.vinschen.de>
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On Mar 10 14:32, Corinna Vinschen wrote:
> Hi Marco,
>=20
> 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.
> >=20
> > The aim is to produce something like
> >=20
> > {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: <172.21.188.188>
> >         Local Area Connection
> >=20
> > 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
>=20
> 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.

Oh, I see.  The friendlyname is there, but struct ifaddrs is missing a
pointer to it.  That's the confusion you get when reusing the same
function and structure type for multiple APIs.

This could be easily rectified by utilizing the ifa_data pointer which
is unused so far.  It could point to a structure pointing to the other
values collected but not yet exposed by getifaddrs, e.g.:

  struct ifall_data
  {
    struct sockaddr         ifa_hwaddr;
    int                     ifa_metric;
    int                     ifa_mtu;
    int                     ifa_ifindex;
    struct ifreq_frndlyname ifa_frndlyname;
  };

  ifa_data =3D pointer to ifall_data;

Would that help to get this into Cygwin 2.5.0?


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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