linux-kernel - Re: PROPOSAL: extend pipe() to support NULL argument.

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Message-ID: <20090703102325.GK5880@cr0.nay.redhat.com>
Date:	Fri, 3 Jul 2009 18:23:25 +0800
From:	Amerigo Wang <xiyou.wangcong@...il.com>
To:	Changli Gao <xiaosuo@...il.com>
Cc:	Amerigo Wang <xiyou.wangcong@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: PROPOSAL: extend pipe() to support NULL argument.

On Fri, Jul 03, 2009 at 05:59:10PM +0800, Changli Gao wrote:
>On Fri, Jul 3, 2009 at 5:42 PM, Amerigo Wang<xiyou.wangcong@...il.com> wrote:
>>>I said: It just a special case. Fixing sendfile() won't fix everything.
>>
>> What do you want? Just saving an fd, isn't it?
>>
>> sendfile() does this but you said it's buggy, if you fix it, what is the
>> rest problem?
>>
>You should know why Linux invented splice(2). Not all of the problems
>can be solved by sendfile(2).

Sure, it definitely can be seen from the interface....

>
>>>
>>>In fact, sendfile(2) is implemented via splice(2) infrastructure. The
>>>logic is the same, and much clever than yours. Dive into its code, you
>>>will find the reason why it must be blocked on outfd.
>>
>>
>> Sure, this is done in user-space, definitely....
>>
>Did you review the code of sendfile(2)? 

Not at all.

I just wanted to show what I wanted to say, not to re-implement
sendfile(2).
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