Re: How to run an a.out file in a kernel module

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 <erik@xxxxxxxxxxxxxxxxxxxxx> 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

--
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