Linux2.6 Internal Model module Loading Problems

Linux-Linux general technology-Linux programming and kernel information-how to load internal model modules. 1. A simple driver

// Hello. c

# Ifndef _ KERNEL __
# Define _ KERNEL __
# Endif
# Ifndef MODULE
# Define MODULE
# Endif

# Include
# Include
# Include
Int hello (void)
{
Printk ("This is a module, hello PeiJun! \ N ");
Return 0;

}

Void bye (void)
{
Printk ("Bye-bye! \ N ");
}

Module_init (hello );
Module_exit (bye );


2. Write Makefile

Obj-m: = hello. o
KERNELDIR =/lib/modules/$ (shell uname-r)/build
PWD: = $ (shell pwd)
Default:
$ (MAKE)-C $ (KERNELDIR) M = $ (PWD) modules
Clean:
Rm-f hello. ko hello. mod hello. mod. o hello. o


3. Run make to generate hello. ko hello. mod hello. mod. o hello. o.


4. Execute insmod hello. o.

.....

Insmod: erro inserting 'hello. o':-1 Invalid module format

2.4 will not generate these files, and only 2.6 will generate hello. ko file, *. the ko suffix is used to distinguish kernel modules from general target files. This module is also loaded at the gnome terminal port of x window in 2.4. printk can print normally, but it won't work when it reaches 2.6. not in text mode, mainly because of the priority of printk. the kernel priority can be defined in linux/kernel. h and kernel/printk. c.


5. Execute insmod hello. ko.

Show This is a module, hello PeiJun!


6. View lsmod

Module Size Used

Hello 1536 0


7. Run rmmod hello.

Display: Bye-bye!