From: "Peter Milne" <peter.milne@netspeed.com.au>
To: <cygwin@cygwin.com>
References: <001201c79ea3$4d82bce0$8500a8c0@RUSNAK> <4656D47E.5050906@byu.net> <001201c79f49$b57b3c90$8500a8c0@RUSNAK> <46582F2B.2000300@byu.net>
Subject: RE: [Spam?]Re: problem concating (>>) to a large file
Date: Sun, 27 May 2007 00:07:15 +1000
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Hi Eric

B is 71.8 Mbytes and and according to ls A (actually data.dat) is:
-rw-r--r-- 1 trader None 4540030014 May 26 12:00 data.dat

I'm running the latest version of cygwin.  I hope you are able to reproduce
the problem with dd using this information.

Cheers
    Peter

-----Original Message-----
From: Eric Blake [mailto:ebb9@byu.net] 
Sent: Saturday, 26 May 2007 10:59 PM
To: Peter Milne; cygwin@cygwin.com
Subject: [Spam?]Re: problem concating (>>) to a large file

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http://cygwin.com/acronyms/#PPIOSPE - redirecting to the list

According to Peter Milne on 5/25/2007 9:55 PM:
> Hi Eric
> 
> Thanks for responding to my query.
> 
> Brian Dessent also responded.  He suggested using the following command:
> 
> 	dd if=B of=A bs=64k conv=notrunc oflag=append
> 
> but this gave the same result as >>, that is, it stuck the contents of
file
> B at the front of A rather than at the end.

If that happened, it is a different bug, since dd does not go through the
stdio library, therefore does not see the bug in stdout being in 32-bit
mode instead of 64-bit mode.  Exactly how big are a and b?  I'd like to
try to reproduce this, and observe what strace has to say about it,
because I agree with Brian that it should work.

> It looks like dd is broken in
> this respect in the current version of cygwin.  I wonder if dd will come
> good in 1.70.0 too?  Do you have any idea when 1.70.0 will be released?

1.70.0?  Not for many, many more years (after all, the 1.5.x series lasted
for several years). :)  1.7.0, on the other hand, might be released this
year, once it is ready.  But in classic open source mindset, the release
will be sooner if you help.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@byu.net
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