netdev - Re: ifreq flags or ioctl calls to turn an interface down?

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Date:	Thu, 12 May 2011 15:32:23 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Chin Shi Hong <cshong87@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: ifreq flags or ioctl calls to turn an interface down?

Le jeudi 12 mai 2011 à 21:27 +0800, Chin Shi Hong a écrit :
> Dear all,
> 
> I am developing an application that will turn a network interface down
> (something like command "ifconfig <network interface> down".
> 
> What are the ifreq flags or ioctl calls to turn a network interface down?
> 
> Or is there any other way to implement this feature into my application?

Quick answer :

strace ifconfig eth2 down

...
socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 4

ioctl(4, SIOCGIFFLAGS, {ifr_name="eth2", ifr_flags=IFF_UP|IFF_BROADCAST|
IFF_RUNNING|IFF_MULTICAST}) = 0

ioctl(4, SIOCSIFFLAGS, {ifr_name="eth2", ifr_flags=IFF_BROADCAST|
IFF_RUNNING|IFF_MULTICAST}) = 0



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