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List:       freebsd-hackers
Subject:    Re: Peeking BPF
From:       Lev Walkin <vlm () netli ! com>
Date:       2004-06-29 17:08:08
Message-ID: 40E1A1F8.90003 () netli ! com
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Ivan Voras wrote:
> 
> I need to convert this code:
> 
> ret = recvfrom(thisint->sockInt, &resultframe, 1520, MSG_PEEK, 0, 0);
> if (ret > 0) return TRUE;
> 
> to use BPF. Essentialy, how to find out if a packet is available over 
> the BPF interface?

try to read() it and read() will hang there until there is data in it.
alternatively, use poll() or select() to check for readability event.

	char resultBuffer[65536];
	ret = read(thisint->bpfInt, resultBuffer, sizeof(resultBuffer));
	if(ret > 0) return TRUE;


-- 
Lev Walkin
vlm@netli.com
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