netdev - Re: raw PF_PACKET protocol selection

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Message-ID: <20071009075643.GA17588@gondor.apana.org.au>
Date:	Tue, 9 Oct 2007 15:56:43 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Joakim Tjernlund <joakim.tjernlund@...nsmode.se>
Cc:	Evgeniy Polyakov <johnpol@....mipt.ru>, netdev@...r.kernel.org
Subject: Re: raw PF_PACKET protocol selection

On Tue, Oct 09, 2007 at 09:27:38AM +0200, Joakim Tjernlund wrote:
>
> Just fond out something:
> if I redirect my prog like so:
> ./sniff > log
> and press Ctrl-C after a packet has been sent to it, 
> it does NOT work. I don't get ANY output in my "log" file, not
> even the printf("---------\n") appears.
> But if I run whithout redirect it works(at least with ETH_P_BPQ)
> Anyone else see this too?

Um, this is what we call buffering.

You either need to turn buffering off with setbuf(3) or you
should install a SIGINT handler to flush the output before
exiting.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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