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Message-ID: <1146.130.240.136.220.1128010212.squirrel@pinus>
Date: Thu, 29 Sep 2005 18:10:12 +0200 (CEST)
Subject: Re: Bug in dd ?? at EOM
From: "Bengt-Arne Fjellner" <Bengt-Arne DOT Fjellner AT ltu DOT se>
To: cygwin AT cygwin DOT com
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Corinna Vinschen skrev:
> On Sep 26 12:08, Dave Korn wrote:
>> ----Original Message----
>> >From: Bengt-Arne Fjellner
>> >Sent: 26 September 2005 11:43
>>
>> > When using dd with flags conv=noerror,sync
>> > It tries reading after the disc ends.
>> >
>> > This line in cygwin tries reading past end of media:
>> >  dd if=/dev/sdd of=kkkkkk bs=512 skip=156280250 conv=noerror,sync
>> > dd: reading `/dev/sdd': Input/Output error
>> > 21120+0 records in
>> > 21120+0 records out
>> > 10813440 bytes (11 MB) copied, 1.151 seconds, 9.4 MB/s
>> > dd: reading `/dev/sdd': Input/Output error
>> > 21120+1 records in
>> > 21121+0 records out
>> > repeats "forever"
>> >
>>
>> > Stops at end of disk. Whos wrong?
>>
>>   There is very definitely a problem with cygwin vs. dd, which I'm
>> investigating.  I've seen the same thing with CF%20memory cards, and initially
thought it was directly related to the memcard driver, but I was becoming
convinced it's a generic problem with cygwin's readv, and since you've found it
shows up on hard drives as well, that confirms it for me.  I'll get round to it
late tonight.
>
> I've applied a patch which tries to workaround the strange behaviour of Win32
ReadFile when reading beyond EOF.  Please give the next developers snapshot a try.
>
>
> Corinna
>

That works for me now with latest snapshot.
Havent tested yet with a failing disk though.

Reading /dev/fd0 fails :-(
$ dd if=/dev/fd0 of=kkkkkk bs=512 conv=noerror,sync
dd: opening `/dev/fd0': Invalid request code

with snapshot cygwin1-20050928.dll

-- 
Bengt-Arne Fjellner



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