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Date: Wed, 1 Sep 2004 13:44:52 -0700
From: Alfred Perlstein <alfred@freebsd.org>
To: "Justin T. Gibbs" <gibbs@scsiguy.com>
Message-ID: <20040901204452.GO31434@elvis.mu.org>
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cc: cvs-src@FreeBSD.org
cc: Brooks Davis <brooks@FreeBSD.org>
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cc: src-committers@FreeBSD.org
Subject: Re: cvs commit: src/sbin/ifconfig ifconfig.c src/sys/net if.c if.h
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* Justin T. Gibbs <gibbs@scsiguy.com> [040901 13:43] wrote:
> 
> > brooks      2004-09-01 18:22:14 UTC
> > 
> >   FreeBSD src repository
> > 
> >   Modified files:
> >     sbin/ifconfig        ifconfig.c 
> >     sys/net              if.c if.h 
> >   Log:
> >   Use a spare byte in struct if_data to store the structure size without
> >   increasing it.  Add code to ifconfig to use this size to find the
> >   sockaddr_dl after the struct if_data in the routing message.  This
> >   allows struct if_data to grow (up to 255 bytes) without breaking
> >   ifconfig.
> 
> You could squeeze out 256 bytes if you treat 0 as meaning 256 - just like
> the SCSI protocol.

Or treat 0 as "look at some other location for length" of int width. :)

-- 
- Alfred Perlstein
- Research Engineering Development Inc.
- email: bright@mu.org cell: 408-480-4684