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From: Eric Blake <ebb9 AT byu DOT net>
Subject:  Re: [Spam?]Re: problem concating (>>) to a large file
Date: Tue, 29 May 2007 19:46:00 +0000 (UTC)
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Corinna Vinschen <corinna-cygwin <at> cygwin.com> writes:

> I fixed both bugs in CVS.  It's rather disappointing that
> 
>   SetFilePointer (handle, 0, NULL, FILE_END);
> 
> fails for files > 4Gigs.  It's actually required that the offset_high
> pointer is a valid pointer to a LONG containing 0.  Oh well.

Nice catch; I was trying to spot it myself, and it is crystal clear now that I 
go reread the msdn page on SetFilePointer, but I wasn't seeing it on my own.  
At least it was twice as generous as ftell/fseek failing on files > 2GB - 1 
byte.

Shoot - now that means I have to fix coreutils ASAP so that the trivial 'cat 
smallfile >> smallfile' will once again work for snapshot users, now that you 
correctly took away the non-POSIX seek in exec()!  Thanks for the quick 
turnaround on fixing the cygwin side of this, and for the OP's persistence.  
And thank goodness for sparse files in NTFS (as I don't really have 4 gig of 
disk space available in my /tmp).

-- 
Eric Blake



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