kernel programming starter

[abdul_bari]

hi friends,

Iam new to Kernel Programming.

I just started by a basic example given in the book

My Kernel Version is 2.6.24.2 and OS is Federo Core 9

example program hello.c is
//////////////////////////////////////////////////////

#include <linux/module.h>
#include <linux/kernel.h>
int init_module(void)
{
printk("<1>Hello world 1.\n");
return 0;
}
void cleanup_module(void)
{
printk(KERN_ALERT "Goodbye world 1.\n");
}
--------------------------------------------------

makefile is

obj−m += hello.o

at command prompt i gave the command

make -C /usr/src/linux-`uname -r` SUBDIRS=$PWD modules


but the result is

make: Entering directory `/usr/src/linux−2.6.24.2
Building modules, stage 2.
MODPROBE 0 modules
make: Leaving directory `/usr/src/linux−2.6.24.2

its not creating the corresponding .ko files

plz help me where i have gone wrong

[digvijay.gahlot]

You forgot to add

module_init(init_module);
module_exit(cleanup_module);

at end of the c file.

[abdul_bari]

i tried what u have told

but still its giving the same output

[digvijay.gahlot]

Add
MODULE_LICENSE("GPL");
in your C file.

Make a Makefile in the same directory with the content

ifneq ($(KERNELRELEASE),)
obj-m := hello.o
else
KERNELDIR ?= <Your Kernel path>
PWD := $(shell pwd)
default:
$(MAKE) -C $(KERNELDIR) M=$(PWD) modules
endif

and use make command to compile.

[abdul_bari]

thanks vijay

i got that . But inspite of giving the priority level as 1 . The output is getting

written to /var/log/messages file instead of console.

[digvijay.gahlot]

If you are expecting the result on X terminal then you are wrong.
Press Ctrl + Alt + F1 login and run thre program you will get your result.
Cheers