linux-kernel - Re: AF_UNIX MSG

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Message-Id: <E1JCkrp-0000vX-00@gondolin.me.apana.org.au>
Date:	Thu, 10 Jan 2008 11:01:53 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Brent Casavant <bcasavan@....com>
Cc:	penguin-kernel@...ove.sakura.ne.jp, netdev@...r.kernel.org,
	davem@...emloft.net, linux-kernel@...r.kernel.org
Subject: Re: AF_UNIX MSG_PEEK bug?

Brent Casavant <bcasavan@....com> wrote:
> 
>> Did you try MSG_WAITALL flag? See "man 2 recv".
>> A TCP socket handles data in bytes.
>> You cannot complain if the amount received by recv() is smaller than expected
>> unless you use MSG_WAITALL flag.
> 
> Yes. It made no difference, as noted in the comments in the
> provided test program.

The POSIX text for MSG_WAITALL actually says that when used in
conjunction with MSG_PEEK it may not return the full data.

Having said that, I do agree that having TCP and AF_UNIX behave
in the same way is a plus.  However, if you really want this to
happen it would help if you had attached a patch :)

Thanks,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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