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From: | Pádraig Brady |
Subject: | bug#13391: dd silently ignores lseek error |
Date: | Wed, 09 Jan 2013 01:14:22 +0000 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120615 Thunderbird/13.0.1 |
On 01/08/2013 08:55 PM, Paul Eggert wrote:
On 01/08/13 10:11, Neil Klopfenstein wrote:Note that it begins reading at the _beginning of the ar file_ -- the 'skip' argument has failed silently.But the 'skip' hasn't failed. It's merely being implemented via 'read' rather than via 'lseek'. The records are being skipped correctly. It might be useful to give dd a new option, which causes it to insist on lseeking rather than reading in cases like these, and to report an error if the lseek fails.
I had a look around for a tool to verify that a file/device supports the seek operation and couldn't find one. So this seems like useful functionality. Worth applying the attached? thanks, Pádraig.
dd-flag-seekable.diff
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