Question

I have:

1. A C program main.c with the main function that has the function call.
2. Another C program test.c with function definitions.
3. A header test.h has the common declarations.

Pls read Carefully my objective
my objective is to have a kernel object and a appliction that uses it.
and i need to give some inputs to the function at runtime and process with that.

i’m using it in terminal.
Can anyone please help me out?

Answer 1

For compiling kernel module, you can write this basic makefile :

obj-m += <your_obj_file>.o

all:
    make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

clean:
    make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

After that, you’ll have to build and load your module with

make
insmod <your_module>.ko

But when I read you, I guess that what you really want to do is not a kernel module.
I think you want to build a shared library (.so file or .dll), isn’t it ?

If it’s a linux shared library you want to build here’s the commands to invoke :

gcc -c -fPIC test.c
gcc -shared test.o -o libtest.so

gcc -c main.c
gcc main.o -o <binary name> -ltest

But if you just want to build a static binary in the classical way :

gcc -c test.c
gcc -c main.c

gcc test.o main.o -o <binary name>