Date: Tue, 8 Jan 2008 17:18:48 -0600 (CST)
From: Brent Casavant <bcasavan@sgi.com>
Reply-To: Brent Casavant <bcasavan@sgi.com>
To: Tom Spink <tspink@gmail.com>
cc: Rick Jones <rick.jones2@hp.com>, netdev@vger.kernel.org,
       David Miller <davem@davemloft.net>, linux-kernel@vger.kernel.org
Subject: Re: AF_UNIX MSG_PEEK bug?
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On Tue, 8 Jan 2008, Tom Spink wrote:

> Where in the code is the message length being sent across the socket?

In do_producer(), there are the following lines in the main loop:

	/* Send random lengths of data */
	messages[i].length = (rand() % MAXLEN) + sizeof(size_t);
	iov[i].iov_len = messages[i].length;

The entire "struct sockmsg" is sent across the socket, so the first
size_t in each message contains the length of the entire message
(including the size_t).  This size gets picked up at the
recv(...,MSG_PEEK) line in do_consumer().

Thanks,
Brent

-- 
Brent Casavant                          All music is folk music.  I ain't
bcasavan@sgi.com                        never heard a horse sing a song.
Silicon Graphics, Inc.                    -- Louis Armstrong
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