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Date: Fri, 9 Aug 2002 17:42:32 -0400
From: Phil Auld <pauld@egenera.com>
To: Andries Brouwer <aebr@win.tue.nl>
Cc: Andrew Morton <akpm@zip.com.au>, linux-kernel@vger.kernel.org
Subject: Re: why is lseek broken (>= 2.4.11) ?
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Rumor has it that on Fri, Aug 09, 2002 at 11:13:06PM +0200 Andries Brouwer said:
> On Fri, Aug 09, 2002 at 01:48:47PM -0700, Andrew Morton wrote:
> 
> > What should the behaviour be?   The lseek should succeed,
> 
> Yes
> 
> > but subsequent reads and writes return zero?
> 
> Yes. The first read must return 0. Subsequent reads may return 0
> or return the ENXIO error.
> 
> For read: "No data transfer shall occur past the current end-of-file.
> If the starting position is at or after the end-of-file, 0 shall be
> returned. If the file refers to a device special file, the result of
> subsequent read() requests is implementation-defined."
> 
> ENXIO: "the request was outside the capabilities of the device".
> 
> For write: "If a write() requests that more bytes be written than
> there is room for (for example, ... the physical end of a medium),
> only as many bytes as there is room for shall be written.
> 

Agreed. That is what the standards say... And what userspace has come to expect.


Phil


> 
> Andries
> -
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-- 
Philip R. Auld, Ph.D.                  Technical Staff 
Egenera Corp.                        pauld@egenera.com
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