From mboxrd@z Thu Jan  1 00:00:00 1970
From: Yang Hongyang <yanghy@cn.fujitsu.com>
Subject: get receiving interface index while no message is received
Date: Fri, 08 Aug 2008 12:27:06 +0800
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To: David Miller <davem@davemloft.net>
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when I use getsockopt(sk, IPPROTO_IPV6, IPV6_2292PKTOPTIONS,(char *)incmsg, &cnt)
to get receiving interface index while no message is received,

What interface index should be returned?