Hi,
1) What is the synatx of call_usermodehelper()
function?
I found out that it takes 4 arguments. But
what values we have to pass as argumets.
I did searched in internet. But could not find out.
Sorry to post this question.
2) How to print something using C code such that it
will be displayed when corresponding a.out file is
called in a kernel module using call_usermodehelper()
function.
Thanks in advance.
--- Erik Mouw <[email protected]> wrote:
> On Fri, Oct 27, 2006 at 11:16:11AM +0100, ranjith
> kumar wrote:
> > How to run an a.out file in a kernel
> module
> > I tried to include
> >
> system("./a.out");
> > in the C file. But I got compilation errors.
>
> Simple: you don't. There are a bunch of problems
> over here:
>
> 1) The system() call is a userland libc call and
> doesn't exist in the
> kernel
> 2) You can't be sure you're in user context
> 3) You don't know in what filesytem namespace you
> are
>
> You could use call_usermodehelper() if you really
> need to call a
> usermode helper, but usually it's a sign of bad
> design if you need to.
>
>
> Erik
>
> --
> +-- Erik Mouw -- www.harddisk-recovery.com -- +31 70
> 370 12 90 --
> | Lab address: Delftechpark 26, 2628 XH, Delft, The
> Netherlands
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