netdev - Re: [IPV6]: ROUTE:read ifname in rt6_info

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Message-ID: <m2y6u07dh3.fsf@igel.home>
Date:	Thu, 16 Apr 2009 18:47:04 +0200
From:	Andreas Schwab <schwab@...ux-m68k.org>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	David Miller <davem@...emloft.net>, ysugiura@...aclelinux.com,
	netdev@...r.kernel.org
Subject: Re: [IPV6]: ROUTE:read ifname in rt6_info_route()

Stephen Hemminger <shemminger@...tta.com> writes:

> On Thu, 16 Apr 2009 04:38:00 -0700 (PDT)
> David Miller <davem@...emloft.net> wrote:
>
>> From: Yuta sugiura <ysugiura@...aclelinux.com>
>> Date: Thu, 16 Apr 2009 20:05:05 +0900
>> 
>> > Hi,
>> > I have a suggestion about /proc/net/IPv6_route format.
>> > In rt6_info_route(), interface name is treated as a maximum 8
>> > characters.
>> > But the type of (struct rt6_inf *)->u.dst.dev->name is char[IFNAMESIZ=
>> > 16]
>> > so, I think that it should change "%8s" to "%16s".
>> 
>> Isn't there a way to pass the field length as a paramenter
>> to formatting functions?  Then we can just pass in
>> IFNAMESIZE as that parameter.
>
> 	seq_printf(m, " %08x %08x %08x %08x %*s\n"
>                    rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt),
>  		   rt->u.dst.__use, rt->rt6i_flags,
>                    IFNAMESIZE, 
>  		   rt->rt6i_dev ? rt->rt6i_dev->name : "")

Actually since it is the last item on the line a field width does not
make much sense, and omitting it would print the name left justified.

(And RT6_INFO_LEN is not used any more.)

Andreas.

-- 
Andreas Schwab, schwab@...ux-m68k.org
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