uaccess.h

[luis herrada]

Martinjn:

I write code for the Kernel space. You are right when
you say that uaccess.h has functions for specific
purposes, in my case I want to transfer data from the
Kernel to  the user space. It 'd be great if the
library did what it is supposed to do, but I receive a
single error from the header uaccess.h .
Do you think that Red Hat 6.2 is not working fine with
some functions? My code is so simple to have errors.
Check the constant "Current" in sched.h
I 'd appreciate your help.

Luis Herrada


--- Martijn van Oosterhout <kleptog at svana.org> wrote:
> On Tue, Jul 16, 2002 at 02:44:56PM -0700, luis
> herrada wrote:
> > 
> > Hello, I am new in this list and I'd like to know
> if
> > there is anyone who has used the header uaccess.h
> > which is included with the sources in my Red Hat
> 6.2
> > 
> > I am just learning about the design of device
> drivers
> > under Linux so I wanted to compile a simple
> program
> > that detects a hardware (in this case a plain
> memory
> > address). Everything was going fine until I ran
> into
> > the functions copy_to_user and copy_from_user
> which
> > are defined in the header uaccess.h.
> 
> Is this a user-space program or a kernel module?
> Those functions are for
> kernel modules only and even then only for
> processing parameters from user
> space.
> 
> > I received an error message from this header that
> says
> > "Deference pointer ..." in the function
> verify_area.
> > 
> > Errors in my source code can be corrected but
> errors
> > in the headers are not easy to solve because I
> didn't
> > write them.
> > Has any of you had problems like this one using
> this
> > horrible library?
> > I am using the Kernel version 2.2.14.
> > I can send the source code if required.
> 
> Horrible library? It's a set of functions for a very
> specific purpose. If
> it's a user-space program and you are directly
> #include ing files from
> either asm/ or linux/, you're almost certainly doing
> something wrong.
> 
> I think you need to be more specific.
> -- 
> Martijn van Oosterhout   <kleptog at svana.org>  
> http://svana.org/kleptog/
> > There are 10 kinds of people in the world, those
> that can do binary
> > arithmetic and those that can't.
> 


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