netdev - Re: IP_MULTICAST_IF getsockopt man part

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Date:	Wed, 06 May 2015 12:35:25 +0200
From:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To:	Jiri Pirko <jpirko@...hat.com>
CC:	mtk.manpages@...il.com, linux-man@...r.kernel.org,
	netdev@...r.kernel.org,
	Magnus REFTEL <magnus.xm.reftel@...ricsson.com>
Subject: Re: IP_MULTICAST_IF getsockopt man part

[CC += Magnus, who made a related reported soon after yours.]

Jiri,

On 05/09/2012 11:34 AM, Jiri Pirko wrote:
> Sat, May 05, 2012 at 01:57:35PM CEST, mtk.manpages@...il.com wrote:
>> On Fri, May 4, 2012 at 9:00 PM, Jiri Pirko <jpirko@...hat.com> wrote:
>>> 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)
>>
>> Jirka,
>>
>> I'm having trouble to understand what you mean. Perhaps it would be
>> simplest if you showed your proposed replacement text for the text
>> quoted above.
> 
> <orig>
> 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.
> </orig>
> <new>
> IP_MULTICAST_IF (since Linux 1.2)
> Set or read the local device for a multicast socket.
> Argument for set is an ip_mreqn or ip_mreq or addr_in structure.
> Argument for read is an addr_in structure.
> </new>

Long after the fact: I've amended the man page text to read:

       IP_MULTICAST_IF (since Linux 1.2)
              Set  the local device for a multicast socket.  The argu‐
              ment for setsockopt(2) is an ip_mreqn  or  (since  Linux
              3.5)  ip_mreq structure similar to IP_ADD_MEMBERSHIP, or
              an in_addr  structure.   (The  kernel  determines  which
              structure  is  being  passed based on the size passed in
              optlen.)  For getsockopt(2), the argument is an  in_addr
              structure.

Cheers,

Michael


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
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