Loadable Kernel Modules

[linuxcomando]

Well after a while of reading,reading and some more reading i thought id share how-to creat a Loadable Kernel Module.

Lets begin with creating a simple C program.
%vi hello.c

#include <linux/module.h>

#if defined(CONFIG_SMP)
#define __SMP__
#endif

#if defined (CONFIG_MODVERSIONS)
#define MODVERSIONS
#include <linux/modversions.h>
#endif

#include <linux/kernel.h>

int int_module (void)
{

[linuxcomando]

connection got dropped....heres the rest.

printk (KERN_DEBUG "Hello,kernel!\n);

[linuxcomando]

connection got dropped....heres the rest.

printk (KERN_DEBUG "Hello,kernel!\n);

return 0;
}
void cleanup_module(void)
{

[linuxcomando]

Guys sometimes i hate friggin computers.....


Lets begin with creating a simple C program.
%vi hello.c

#include <linux/module.h>

#if defined(CONFIG_SMP)
#define __SMP__
#endif

#if defined (CONFIG_MODVERSIONS)
#define MODVERSIONS
#include <linux/modversions.h>
#endif

#include <linux/kernel.h>

int int_module (void)
{
printk(KERN_DEBUG "Hello, World! \n);
return 0;
}
void cleanup_module (void)
{
printk(KERN_DEBUG "Good-bye, World! \n";
}


Now do a gcc -D__KERNEL__ -I/lib/modules/$(uname -r)/build/include -DMODULE -Wall -c hello.c -o hello.o

Next do a insmod hello.o
dmesg | tail -n1 will show you your message
lsmod will show you all of the loaded modules
rmmod will take out any module you want

[souleman]

You know, you can always delete your old posts And there is always a cut and paste by writing it in vi first.

Anyway, never wrote my own kernal mod, but I have installed them a few times. This was a really good, basic tut....

[linuxcomando]

But i think having 2 half completed posts adds character to my posts
Funny enough my last one i did exactly that wrote it in vi and pasted it .
But im glad you liked my tut. It really is an intro into in to LKM.
Im getting a little better at writing them but they can be punks !

[pooh sun tzu]

er, it seems there were a few typos in the code, so I fixed them?



#include &lt;linux/module.h&gt;

#if defined(CONFIG_SMP)
#define __SMP__
#endif

#if defined (CONFIG_MODVERSIONS)
#define MODVERSIONS
#include &lt;linux/modversions.h&gt;
#endif

#include &lt;linux/kernel.h&gt;

int int_module (void)
{
printk(KERN_DEBUG "Hello, World! \n");
return 0;
}
void cleanup_module (void)
{
printk(KERN_DEBUG "Good-bye, World! \n");
}