Package: manpages
Version: 3.05-1
ip(7) describes that the argument for IP_MULTICAST_IF is ip_mreqn or ip_mreq:
IP_MULTICAST_IF
Set the local device for a multicast socket. Argument is an
ip_mreqn or ip_mreq structure similar to IP_ADD_MEMBERSHIP.
But it should be ip_mreqn or in_addr.
It is different from IP_ADD_MEMBERSHIP.
At the original API of BSD multicast, IP_MULTICAST_IF takes struct in_addr.
http://www.kohala.com/start/mcast.api.txt
do_ip_setsockopt() in Linux net/ipv4/ip_sockglue.c seems to support
ip_mreqn and in_addr.
--
Tanaka Akira
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