Re: [PATCH net-next] sockopt: Change getsockopt() of SO_BINDTODEVICE to return an interface name

From: Andi Kleen <redacted>
Date: Wed, 31 Oct 2012 13:47:01 -0700

Brian Haley [off-list ref] writes:

quoted

Instead of having the getsockopt() of SO_BINDTODEVICE return an index, which
will then require another call like if_indextoname() to get the actual interface
name, have it return the name directly.

This also matches the existing man page description on socket(7) which mentions
the argument being an interface name.

If the value has not been set, zero is returned and optlen will be set to zero
to indicate there is no interface name present.

That will break all existing programs using the return value, right?
Better to fix the manpage

It never returned a value before, you could not getsockopt() on
SO_BINDTODEVICE previously.