From: Andreas Schwab <schwab@suse.de>
To: Matt Mackall <mpm@selenic.com>
Cc: Dave Hansen <haveblue@us.ibm.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: /proc/$pid/pagemap troubles
Date: Wed, 01 Aug 2007 00:58:21 +0200 [thread overview]
Message-ID: <je4pjkqiya.fsf@sykes.suse.de> (raw)
In-Reply-To: <20070731213718.GW11115@waste.org> (Matt Mackall's message of "Tue\, 31 Jul 2007 16\:37\:18 -0500")
Matt Mackall <mpm@selenic.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@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
next prev parent reply other threads:[~2007-07-31 22:58 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-31 20:36 Dave Hansen
2007-07-31 21:37 ` Matt Mackall
2007-07-31 22:43 ` Dave Hansen
2007-08-01 0:14 ` Matt Mackall
2007-08-01 16:06 ` Dave Hansen
2007-07-31 22:58 ` Andreas Schwab [this message]
2007-07-31 23:06 ` Dave Hansen
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