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Old 12-07-2007, 12:30 AM   #1
jayeshleo
LQ Newbie
 
Registered: Nov 2007
Posts: 3

Rep: Reputation: 0
Insert a user written .c program in kernel 2.4.20-8


Hello!

I have written a hello.c program
#define MODULE
#define LINUX
#define __KERNEL__

#include<linux/init.h>
#include<linux/module.h>
#include<linux/kernel.h>
#include<linux/config.h>



int init_module(void)
{
printk("<1> Hello World 1.\n");
return 0;
}

void cleanup_module(void)
{
printk("<1> Bye World");
}

I have also written a Makefile for it...

TARGET := hello
WARN := -W -Wall -Wstrict-prototypes -Wmissing-prototypes
INCLUDE := -isystem /lib/modules/'uname -r'/build/include
CFLAGS := -O2 -DMODULE -D__KERNEL__ ${WARN} ${INCLUDE}
CC := gcc

${TARGET}.o: ${TARGET}.c

.PHONY: clean

clean:
rm -rf ${TARGET}.o

Can anybody please tell me the steps to insert the module in the kernel. so that if i do dmesg on terminal it should say "Hello World"..Tell me corrections if any in the above two programs...

Thanks

Last edited by jayeshleo; 12-07-2007 at 12:31 AM.
 
Old 12-07-2007, 01:34 AM   #2
dwhitney67
Senior Member
 
Registered: Jun 2006
Location: Maryland
Distribution: Kubuntu, Fedora, RHEL
Posts: 1,533

Rep: Reputation: 335Reputation: 335Reputation: 335Reputation: 335
Well, if you are able to successfully compile your module, then inserting it is a breeze. You need to do it using this command:

Code:
# insmod /path/leading/to/your-module.ko
You can verify if the module loaded by running:
Code:
# lsmod | grep your-module
You can then remove the module using this command:

Code:
# rmmod your-module
 
Old 12-07-2007, 01:42 AM   #3
dwhitney67
Senior Member
 
Registered: Jun 2006
Location: Maryland
Distribution: Kubuntu, Fedora, RHEL
Posts: 1,533

Rep: Reputation: 335Reputation: 335Reputation: 335Reputation: 335
Btw, I should add that I'm no expert when it comes to developing/compiling kernel modules, however I must state that your Makefile look overly complex compared to one that I use for a kernel module. My Makefile looks like:
Code:
obj-m += my-module.o
I build the module running this command:

Code:
make -C /lib/modules/`uname -r`/build M=`pwd`
For this to work, I must be in the directory where the source code of my kernel module and the Makefile (shown above) exists.
 
  


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