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bug#8490: dd reads random number of records from pipes - named or otherw
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From: |
Eric Blake |
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Subject: |
bug#8490: dd reads random number of records from pipes - named or otherwise - coreutils 8.9 |
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Date: |
Wed, 13 Apr 2011 09:13:59 -0600 |
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User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.15) Gecko/20110318 Red Hat/3.1.9-3.el6_0 Mnenhy/0.8.3 Thunderbird/3.1.9 |
On 04/13/2011 08:39 AM, Bjartur Thorlacius wrote:
> Have you looked into fullblock? If you only specify bs and count (and
> not ibs or obs) dd may fill the buffer partially. It'll do try to do
> count copies, but each copy may contain less data than expected. This
> sort of makes sense on HDDs or tapes with variable block sizes (where
> a read would return a whole block, but the block would be smaller than
> user specified bs). In this case dd will preserve the original block
> size. I've never encountered such an odditie — Or maybe I have,
> without noticing.
>
> I think about noone that hasn't been involved in the development, in
> one way or another, gets this wrong (I don't quite get it yet). I
> think this should be changed, unless the user provids a hypothetical
> partblock option.
It can't be changed without changing POSIX.
--
Eric Blake address@hidden +1-801-349-2682
Libvirt virtualization library http://libvirt.org
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