How to use memcpy in kernel driver

How to use memcpy in kernel driver

[m silverstri]

Hi,

How can I use memcoyp in memcpy?
I try #include stdio.h and string.h, but .h fails to include during compilation.

Can you please help me?

Thank you.

How to use memcpy in kernel driver

[Valdis.Kletnieks at vt.edu]

On Mon, 27 Jan 2014 11:53:00 -0800, m silverstri said:

> I try #include stdio.h

> Can you please help me?

stdio is a libc invention, only used in userspace.  As such, you can't
call anything in a shared library from within kernel code (although there
are similarly named routines for many things).
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How to use memcpy in kernel driver

[Kristof Provost]

On 2014-01-27 11:53:00 (-0800), m silverstri <michael.j.silverstri@gmail.com> wrote:
> How can I use memcoyp in memcpy?
> I try #include stdio.h and string.h, but .h fails to include during compilation.
> 
That's because stdio.h is a C library header. You can't use the C
library in the kernel.

You should actually be able to include string.h, but you need the kernel
version, which lives in include/linux/string.h.
The kernel provides a few of the functions usually provided by the C
library. Things like memcpy() and memset() exist. printf() doesn't, but
there is an sprintf(), ...

Kristof

How to use memcpy in kernel driver

[Augusto Mecking Caringi]

On Mon, Jan 27, 2014 at 5:53 PM, m silverstri <
michael.j.silverstri@gmail.com> wrote:
>
> How can I use memcoyp in memcpy?
> I try #include stdio.h and string.h, but .h fails to include during
> compilation.
>

Hi,

    stdio.h and string.h are glibc header files (userspace)... Kernelspace
is another thing.

    Try to include "linux/string.h"

-- 
Augusto Mecking Caringi
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