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Date: Thu, 2 Sep 2004 04:15:11 -0700
From: Alfred Perlstein <alfred@freebsd.org>
To: Ruslan Ermilov <ru@freebsd.org>
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cc: "Justin T. Gibbs" <gibbs@scsiguy.com>
cc: cvs-src@freebsd.org
cc: Brooks Davis <brooks@freebsd.org>
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Subject: Re: cvs commit: src/sbin/ifconfig ifconfig.c src/sys/net if.c if.h
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* Ruslan Ermilov <ru@freebsd.org> [040901 23:47] wrote:
> On Wed, Sep 01, 2004 at 01:44:52PM -0700, Alfred Perlstein wrote:
> > * 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. :)
> > 
> That wouldn't be backwards compatible, which was the intent.

or 255 or some other escape sequence. :)


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