On 8/10/17 10:48 AM, David Miller wrote: > From: Andrew Lunn <and...@lunn.ch> > Date: Thu, 10 Aug 2017 18:27:22 +0200 > >> On Thu, Aug 10, 2017 at 05:24:55PM +0200, Vitaly Kuznetsov wrote: >>> Andrew Lunn <and...@lunn.ch> writes: >>> >>>>> We are - rtnetlink_event() does the job. We, however, don't have a >>>>> special IFLA_EVENT_* for name change and end up with IFLA_EVENT_NONE. >>>> >>>> What is in this event? Old and new name? Just the new name? >>> >>> Basically, it's everything we know about the interface - type, index, >>> name, mtu, qdisc, ... - see rtnl_fill_ifinfo(). Back to your question - >>> it's only the new name. >> >> So the program needs to keep track of ifindex to know which interface >> has changed name. Doable. >> >> I still expect this has the potential to break something. You probably >> should be asking on linux-api for the API experts opinion. > > But a greater point is that nobody is monitoring device renames > explicitly right now.
Just to throw in an example: https://github.com/kobolabs/dhcpcd/blob/kobo/if-linux.c#L761 Learned of its use from a recent regression: https://bugzilla.kernel.org/show_bug.cgi?id=196355
