Review Linux driver basics Hello World

Linux driver manual loading insmod manual uninstall rmmod

Test Environment fedora10

 

Linux Device Driver Version 3:

 

/*************************************** ******/

Hello. c

 

# Include <Linux/init. h>
# Include <Linux/module. h>

Module_license ("dual BSD/GPL ");
Static int hello_init (void)
{
Printk (kern_alert "Hello, world/N ");
Return 0;
}
Static void hello_exit (void)
{
Printk (kern_alert "Goodbye, cruel world/N ");
}
Module_init (hello_init );
Module_exit (hello_exit );

 

 

#/************************************** *******/

Makefile:

 

OBJ-M: = Hello. o

Kerneldir? =/Lib/modules/$ (shell uname-R)/build
PWD: = $ (shell PWD)

ALL:
$ (Make)-C $ (kerneldir) M = $ (PWD)

 

Save the file and compile it using the make command.

# Make

# Insmod hello. Ko

# Rmmod hello. Ko

 

In my test environment, the following information is not displayed in/var/log/messages. So far, the compilation is successful.

 

Mar 27 17:01:30 localhost kernel: Hello, world
Mar 27 17:01:36 localhost kernel: Goodbye, cruel world