linux-kernel - Re: [PATCH] Add preadv2/pwritev2 documentation.

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Message-Id: <20150327094932.31b5c9fc.akpm@linux-foundation.org>
Date:	Fri, 27 Mar 2015 09:49:32 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Milosz Tanski <milosz@...in.com>
Cc:	linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	linux-fsdevel@...r.kernel.org, linux-aio@...ck.org,
	Mel Gorman <mgorman@...e.de>,
	Volker Lendecke <Volker.Lendecke@...net.de>,
	Tejun Heo <tj@...nel.org>, Jeff Moyer <jmoyer@...hat.com>,
	"Theodore Ts'o" <tytso@....edu>, Al Viro <viro@...iv.linux.org.uk>,
	linux-api@...r.kernel.org,
	Michael Kerrisk <mtk.manpages@...il.com>,
	linux-arch@...r.kernel.org, Dave Chinner <david@...morbit.com>
Subject: Re: [PATCH] Add preadv2/pwritev2 documentation.

On Mon, 16 Mar 2015 14:32:26 -0400 Milosz Tanski <milosz@...in.com> wrote:

> +.BR pwritev2 ()
>  can also fail for the same reasons as
>  .BR lseek (2).
> -Additionally, the following error is defined:
> +Additionally, the following errors are defined:
> +.TP
> +.B EAGAIN
> +The operation would block. This is possible if the file descriptor \fIfd\fP refers to a socket and has been marked nonblocking
> +.RB ( O_NONBLOCK ),
> +or the operation is a
> +.BR preadv2
> +and the \fIflags\fP argument is set to
> +.BR RWF_NONBLOCK.

Can you please expand on this to describe the circumstances in which
pread2() returns -EAGAIN?  Let's fix up the short-read confusion.

And let's have a think about EAGAIN vs EWOULDBLOCK.
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