sendfile64?

sendfile64?

[Felix von Leitner]

Why isn't there a sendfile64?

Felix

Re: sendfile64?

[Chris Wedgwood]

    Why isn't there a sendfile64?

because nobody has implemented on -- arguably it's not needed; the
different between:

	sendfile64(...)

and

	while(blah){
		sendfile( ... 1G or so ...)
	}

probably won't be detectable anyhow. I see no reason why sendfile64
should be purely user-space (then again, I see no reason why not to
extend the kernel API as is, but last time I tested it is was busted
WRT signals so I would rather that be fixed before further
proliferation there).



  --cw

Re: sendfile64?

[Jakub Jelinek]

On Tue, Feb 20, 2001 at 02:51:24PM +1300, Chris Wedgwood wrote:
>     Why isn't there a sendfile64?
> 
> because nobody has implemented on -- arguably it's not needed; the
> different between:
> 
> 	sendfile64(...)
> 
> and
> 
> 	while(blah){
> 		sendfile( ... 1G or so ...)
> 	}
> 
> probably won't be detectable anyhow. I see no reason why sendfile64
> should be purely user-space (then again, I see no reason why not to
> extend the kernel API as is, but last time I tested it is was busted
> WRT signals so I would rather that be fixed before further
> proliferation there).

Wrong. sendfile takes a pointer to off_t, not loff_t, so you cannot replace
sendfile64 with multiple sendfile's if offset is non-NULL from userland.
It simply won't work properly on big files (no matter what size you transfer
at a time).

	Jakub

sendfile64()?

[Roy Sigurd Karlsbakk]

hi

where can i find sendfile64()? It doesn't seem to exist in any library 
anywhere ...

roy
-- 
Roy Sigurd Karlsbakk, Datavaktmester

Computers are like air conditioners.
They stop working when you open Windows.

Re: sendfile64()?

[Mark Mielke]

On Fri, May 31, 2002 at 05:53:23PM +0200, Roy Sigurd Karlsbakk wrote:
> where can i find sendfile64()? It doesn't seem to exist in any library 
> anywhere ...

sys/sendfile.h (2.4.18):

    #ifdef __USE_FILE_OFFSET64
    # error "<sys/sendfile.h> cannot be used with _FILE_OFFSET_BITS=64"
    #endif

The real question, then, isn't where is it, but why isn't it?

Somebody else will have to answer this... sorry...
mark

-- 
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Re: sendfile64()?

[Artur Frysiak]

On Fri, May 31, 2002 at 05:53:23PM +0200, Roy Sigurd Karlsbakk wrote:
> hi
> 
> where can i find sendfile64()? It doesn't seem to exist in any library 
> anywhere ...

glibc from CVS ?

Regards
-- 
Artur Frysiak
http://www.pld.org.pl/

Re: sendfile64()?

[Matti Aarnio]

On Tue, Jun 04, 2002 at 03:58:06PM +0200, Artur Frysiak wrote:
> On Fri, May 31, 2002 at 05:53:23PM +0200, Roy Sigurd Karlsbakk wrote:
> > hi
> > 
> > where can i find sendfile64()? It doesn't seem to exist in any library 
> > anywhere ...
> 
> glibc from CVS ?

  It does not exist in (32 bit) kernel, mostly because it doesn't
  make much sense..    Implementing it should be trivial, once
  somebody can show real meaningfull use for it.

> Regards
> Artur Frysiak
> http://www.pld.org.pl/

/Matti Aarnio

Re: sendfile64()?

[Ingo Oeser]

On Tue, Jun 04, 2002 at 05:24:41PM +0300, Matti Aarnio wrote:
>   It does not exist in (32 bit) kernel, mostly because it doesn't
>   make much sense..    Implementing it should be trivial, once
>   somebody can show real meaningfull use for it.

Copy over hard disk images, serving video files (not streams!),
serving database blobs etc.

Doing this only involving pagecache is not beneficial at all?

I'm not an expert in this area, but this would be my preferred
way to implement the above.

Regards

Ingo Oeser
-- 
Science is what we can tell a computer. Art is everything else. --- D.E.Knuth

Re: sendfile64()?

[Benjamin LaHaise]

sendfile64 is in 2.5.  A backport to 2.4 has also been ported; we 
just need to convince Marcelo to accept it for 2.4.20.

		-ben

On Tue, Jun 04, 2002 at 06:36:06PM +0200, Ingo Oeser wrote:
> On Tue, Jun 04, 2002 at 05:24:41PM +0300, Matti Aarnio wrote:
> >   It does not exist in (32 bit) kernel, mostly because it doesn't
> >   make much sense..    Implementing it should be trivial, once
> >   somebody can show real meaningfull use for it.
> 
> Copy over hard disk images, serving video files (not streams!),
> serving database blobs etc.
> 
> Doing this only involving pagecache is not beneficial at all?
> 
> I'm not an expert in this area, but this would be my preferred
> way to implement the above.
> 
> Regards
> 
> Ingo Oeser
> -- 
> Science is what we can tell a computer. Art is everything else. --- D.E.Knuth
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