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To: "David S. Miller" <>
Subject: Re: [PATCH] Trivial patch for SIOCGIFCOUNT
Date: Wed, 10 Oct 2001 11:06:29 +0530	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <> <>

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David S. Miller wrote:

>   From: "BALBIR SINGH" <>
>   Date: Tue, 09 Oct 2001 18:53:47 +0530
>   	To make the API orthogonal, I have included a patch for SIOCGIFCOUNT,
>   which currently returns -EINVAL. The only reason I am providing this patch
>   is to make the API complete and make it easier to port applications from
>   other UNIX like OS'es.
>There is no need for this change, and _EVEN_ if we put this
>change in today every APP out there would _STILL_ need to deal with
>all existing kernels which do not have SIOCGIFCOUNT implemented.
>Furthermore, SIOCGIFCOUNT also gives no new functionality that does
>not exist already.  SIOCGIFCONF with a zero size with give the
>behavior necessary to get the same answer as a SIOCGIFCOUNT would
>provide.  As far as I am aware, every system providing BSD sockets
>provides this SIOCGIFCONF "feature".
>Therefore, it is already quite easy to make applications portable
>between Linux and other BSD socket based systems.  Simply use the
>SIOCGIFCONF method throughout.
I had mentioned even earlier, the same functionality can be obtained otherwise.
I was talking about porting from SUN, HP-UX, AIX, etc. I have had people coming
to me and telling me that SIOCGIFNUM (equivalent to SIOCGIFCOUNT) does not exist
and I have had to ask them to use SIOCGIFCONF, if ifc.ifc_len and ifc.ifc_buf set
to '0', to obtain the total size. Again, it is not a must it should be around.
But since the ioctl is there, it might be good to have it work the way some one
reading a man page would expect it to work, or if somebody wanted to port some
application from Sun, HP-UX or AIX would just do


and get his application to compile without changing the code


>Franks a lot,
>David S. Miller

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  reply	other threads:[~2001-10-10  5:36 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-10-09 13:23 BALBIR SINGH
2001-10-09 22:37 ` David S. Miller
2001-10-10  5:36   ` BALBIR SINGH [this message]
2001-10-10 18:31     ` kuznet

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