On Wed, Dec 2, 2020 at 11:15 AM Schwarz, Konrad via austin-group-l at The Open Group <austin-group-l@opengroup.org> wrote:
> after some (moderate) digging, it seems like the interfaces documented in > net/if.h are not related to anything else defined in POSIX. > > > > To recap, the routines declared there provide a mapping between network > interface names and numeric indexes. However, I couldn’t find any other > interface within POSIX that actually uses either network interface names or > numeric interfaces. This makes it kind of useless. > The numeric indexes are used by several of the IPv6 socket options, such as IPV6_JOIN_GROUP and IPV6_MULTICAST_IF, as described in XSH 2.10.20.4. Philip Guenther
