linux-kernel - Re: /proc/$pid/pagemap troubles

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Message-ID: <je4pjkqiya.fsf@sykes.suse.de>
Date:	Wed, 01 Aug 2007 00:58:21 +0200
From:	Andreas Schwab <schwab@...e.de>
To:	Matt Mackall <mpm@...enic.com>
Cc:	Dave Hansen <haveblue@...ibm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: /proc/$pid/pagemap troubles

Matt Mackall <mpm@...enic.com> writes:

> On Tue, Jul 31, 2007 at 01:36:14PM -0700, Dave Hansen wrote:
>> Since the pagemap code has a little header on it to help describe the
>> format, I wrote a little c program to parse its output.  I get some
>> strange results.  If I do this:
>> 
>> 	fd = open("/proc/1/pagemap", O_RDONLY);
>> 	count = read(fd, &endianness, 1);
>> 
>> count will always be 4.  
>
> Known bug, fixed in my pending and not-currently-working update. It
> ought to return 0 for short reads.

That's not a good choice.  Returning 0 means EOF, but there is actually
data to be read.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@...e.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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