Re: memcpy_tofs... wheres it at?

[Nick Kidd <nkidd@alumni.indiana.edu>]

I was just wondering why you want to use memcpy_tofs
and not copy_(to|from)_user.  From my understanding
(which is very little :)), that is the proper way to
transfer data between user/kernel memory.  You can
look at the definitions for these functions in:

include/asm-i386/uaccess.h (assuming x86 but my guess is that
	each architecture has some version of uaccess.h)
------------------------------------------------------------
#define copy_to_user(to,from,n) 			\
	(__builtin_constant_p(n) ? 			\
	__constant_copy_to_user((to),(from),(n)) : 	\
	__generic_copy_to_user((to),(from),(n)))

If this is incorrect would someone please say why.

Good Luck,
-Nick

* Sharath <sharath_75@yahoo.com> [020410 08:08]:
> yes that is true.. even in 2.4.28 but where is
> memcpy_tofs(...) first defined.. 
> 
> I do not want to include 'other' headers just cause I
> have to.. or has anyone writeen a module that copies
> from kernel space to user space.. and how to do it..
> 
> TIA
> Sharath
> 
> 
> --- Christine Ames <clgisotti@yahoo.com> wrote:
> > --- Amit Kucheria <amitk@ittc.ku.edu> wrote:
> > > On Mon, 8 Apr 2002, Sharath wrote:
> > > 
> > > > Hi...
> > > > 
> > > > just dwelling into writing a device driver and
> > yes
> > > > have got some of it sorted out.. however I would
> > like
> > > > to know where the prototype for memcpy_tofs
> > recides.
> > > 
> > 
> > two places in the 2.4.7-10 kernel:
> > 
> > ../drivers/cdrom/aztcd.c
> > #define memcpy_tofs copy_to_user
> > 
> > ../fs/hpfs/hpfs_fn.h
> > #define memcpy_tofs memcpy
> > 
> > --Christine
> > 
> > 
> > __________________________________________________
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> 
> 
> =====
> -Sharath
> 
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