From owner-freebsd-bugs@FreeBSD.ORG  Sun Jul 29 00:24:48 2012
Return-Path: <owner-freebsd-bugs@FreeBSD.ORG>
Delivered-To: freebsd-bugs@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id F1FC7106566B
	for <freebsd-bugs@FreeBSD.org>; Sun, 29 Jul 2012 00:24:47 +0000 (UTC)
	(envelope-from listlog2011@gmail.com)
Received: from freefall.freebsd.org (freefall.freebsd.org
	[IPv6:2001:4f8:fff6::28])
	by mx1.freebsd.org (Postfix) with ESMTP id DADBF8FC08;
	Sun, 29 Jul 2012 00:24:47 +0000 (UTC)
Received: from [127.0.0.1] (localhost [127.0.0.1])
	by freefall.freebsd.org (8.14.5/8.14.5) with ESMTP id q6T0OjfK043964;
	Sun, 29 Jul 2012 00:24:47 GMT (envelope-from listlog2011@gmail.com)
Message-ID: <501482CD.6050708@gmail.com>
Date: Sun, 29 Jul 2012 08:24:45 +0800
From: David Xu <listlog2011@gmail.com>
User-Agent: Mozilla/5.0 (Windows NT 6.1;
	rv:14.0) Gecko/20120713 Thunderbird/14.0
MIME-Version: 1.0
To: Garrett Cooper <yanegomi@gmail.com>
References: <201207272150.q6RLo9ew012879@freefall.freebsd.org>
In-Reply-To: <201207272150.q6RLo9ew012879@freefall.freebsd.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Cc: freebsd-bugs@FreeBSD.org
Subject: Re: kern/170203: [kern] piped dd&#39; s don&#39; t behave sanely
 when dealing with a fifo
X-BeenThere: freebsd-bugs@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
Reply-To: davidxu@FreeBSD.org
List-Id: Bug reports <freebsd-bugs.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-bugs>,
	<mailto:freebsd-bugs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-bugs>
List-Post: <mailto:freebsd-bugs@freebsd.org>
List-Help: <mailto:freebsd-bugs-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-bugs>,
	<mailto:freebsd-bugs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 29 Jul 2012 00:24:48 -0000

On 2012/7/28 5:50, Garrett Cooper wrote:
> The following reply was made to PR kern/170203; it has been noted by GNATS.
>
> From: Garrett Cooper <yanegomi@gmail.com>
> To: bug-followup@FreeBSD.org, yanegomi@gmail.com
> Cc:
> Subject: Re: kern/170203: [kern] piped dd&#39;s don&#39;t behave sanely when
>   dealing with a fifo
> Date: Fri, 27 Jul 2012 14:47:47 -0700
>
>   Hi David!
>       I'll give the patches you provided a shot this weekend.
>   Thanks!
>   -Garrett
>

FIFO pipe is quite broken! Beside the bug you have reported, there is 
another bug,
when a writer closed the pipe, select() on reader side will never return !
I am curious that so long time, nobody found the bugs, does it because FIFO
is seldom used by people ?