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From Stas Bekman <s...@stason.org>
Subject Re: troubles dealing with APR_HAS_LARGE_FILES=0
Date Tue, 13 May 2003 05:00:54 GMT
Justin Erenkrantz wrote:
> --On Monday, May 12, 2003 15:38:52 +1000 Stas Bekman <stas@stason.org> 
> wrote:
> 
>> I'm trying to figure out why do I get APR_HAS_LARGE_FILES set to zero on
>> my linux box. I can't find any rules that makes that decision. From
>> reading archives, I understood, that it's simply unconditionally turned
>> off. The most recent thread on this topic seems to be:
>> http://marc.theaimsgroup.com/?t=104646080100001&r=1&w=2
> 
> 
> Older versions of glibc do not support compilation with large files 
> turned on and use of sendfile().  If you want to work in those 
> environments, you have to turn off sendfile(), which most people don't 
> want to do in a network-intensive application (like httpd).  For 
> file-intensive apps (like perl), they don't need sendfile and would 
> rather support large files instead.
> 
> I think the Linux kernel has optionally supported sendfile64 since 2.2, 
> but the glibc layer doesn't expose it properly.  So, you could also 
> bypass glibc and perform the syscall directly on Linux versions with 
> sendfile64, but only a 32-bit sendfile().
> 
> Recent versions of glibc supposedly fix it (still only shipped in 
> bleeding-edge distro releases, I think).  I think Sascha (?) posted a 
> proof of concept that would detect newer glibc's or do the syscall 
> itself, but it wasn't a concrete patch, IIRC.  Still, you'd have to 
> disable sendfile() with large files when you see an older glibc and no 
> sendfile64 (which I think is a bad idea to do by default).
> 
> If you'd like to take that proof of concept and create a patch that we 
> could apply, it'd be welcome.  -- justin

Thanks Justin,

I suppose you are talking about his Sasha's reply:
http://marc.theaimsgroup.com/?l=apr-dev&m=104494801601290&w=2

Perhaps Sasha has since then improved his proof of concept, since there is an 
interest.

__________________________________________________________________
Stas Bekman            JAm_pH ------> Just Another mod_perl Hacker
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