From: Eric Hodel <drbrain@...7.net>
Date: 2008-08-08T06:35:07+09:00
Subject: Re: Question about File::Stat and file size

On Aug 7, 2008, at 14:15 PM, Eric Hodel wrote:
> On Aug 7, 2008, at 13:53 PM, Overdorf, Sam wrote:
>> I frequently use the File::Stat structure.
>>
>> I have found the size element is not large enough for DVD's (4Gigs)
>> because it always comes out as a negative number.
>>
>> I also use the restart feature of ftp when transferring a DVD image  
>> and
>> find that the Ruby implementation does not support this large of a  
>> file
>> so I can't restart a transfer picking up where it left off.
>>
>> Does anyone know if this will be addressed in future  
>> implementations of
>> Ruby?
>
> I think the problem is in your operating system:
>
> $ ll big
> -rw-r--r--  1 drbrain  staff  17179869185 Aug  7 14:13 big
> $ ruby -e 'p File::Stat.new("big").size'
> 17179869185
> $ ruby -e 'p File::Stat.new("big").size.class'
> Bignum
> $ uname -a
> Darwin dhcp-218.coop.robotcoop.com 9.4.0 Darwin Kernel Version  
> 9.4.0: Mon Jun  9 19:30:53 PDT 2008; root:xnu-1228.5.20~1/ 
> RELEASE_I386 i386

On a filesystem with sparse-file support (1TB file on a partition with  
45GB free):

$ ll sparse-file
-rw-r--r--  1 drbrain  drbrain  1099511627776 Aug  7 14:30 sparse-file
$ ruby -e 'p File::Stat.new("sparse-file").size'
1099511627776
$ df /data
Filesystem  1K-blocks    Used    Avail Capacity  Mounted on
/dev/ad4s1g  55679808 4424840 46800584     9%    /data
$

maybe the configure script could not find large file support for your  
OS.