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

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Message-ID: <412e6f7f0907052323g114ccbe0n2d17f3d870e42470@mail.gmail.com>
Date:	Mon, 6 Jul 2009 14:23:53 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Albert ARIBAUD <albert.aribaud@...e.fr>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Amerigo Wang <xiyou.wangcong@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: PROPOSAL: extend pipe() to support NULL argument.

On Mon, Jul 6, 2009 at 2:15 PM, Albert ARIBAUD<albert.aribaud@...e.fr> wrote:
>>
>>
>> pipe doesn't support llseek.
>
> I wasn't thinking of actively seeking a file position, but simply that reads
> and writes were independent (and both variable) in size, thus even without
> (l)seeking, each endpoint has an independent read (resp. write) position to
> track what's been read from (resp.written into) it at any time, and such a
> position is, IIUC, single for a given fd, making a fd (a struct file)
> insufficient for representing a pipe.
>
> Amicalement,
> --
> Albert.
>
pipe doesn't refer to pos when reading or writing. Please refer to
pipe_read() and pipe_write() for more detail.


-- 
Regards，
Changli Gao(xiaosuo@...il.com)
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