IP_MULTICAST_IF getsockopt man part

Hi.

<quote>
IP_MULTICAST_IF (since Linux 1.2)
	              Set the local device for a multicast socket.
		      Argument is an ip_mreqn or ip_mreq structure
		      similar to IP_ADD_MEMBERSHIP.
</quote>

That is not true. Setsockopt recognizes only ip_mreqn and in_addr. I
made patch which makes it recognize ip_mreq as well. So that would be
probably ok.
http://patchwork.ozlabs.org/patch/156815/

On the other hand, getsockopt works only with in_addr. That I think is
good behaviour but manpages here needs to be corrected in this way (read
part needs to be added here)

Thanks!

Jirka
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