linux-kernel - Re: [PATCH] tools/perf/util: Document and clean up readn() a bit

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Date:	Wed, 27 Nov 2013 16:50:17 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	David Ahern <dsahern@...il.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mike Galbraith <efault@....de>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] tools/perf/util: Document and clean up readn() a bit

On Wed, Nov 27, 2013 at 08:19:13AM -0700, David Ahern wrote:
> On 11/27/13, 4:57 AM, Ingo Molnar wrote:
> >Okay, I thought this was an intentional 'all or nothing' interface -
> >but looking at the readn() users they can tolerate partial results
> >just fine.
> 
> I believe that is the intent -- an all or nothing interface.

all the users either checks the returned value with the size
or do (ret < 0) and fail

and one instance in the read_attr does not check anything and
blindly hopes it will read all ;-)

I have similar patch that also change callers to use proper
ssize_t instead of int.. I can rebase and send it separately
or combine it with yours.. let me know

jirka
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