A simple kernel module for linux

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#module #makefile #command #basic #shell #linux

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本文介绍了一个简单的Linux内核模块——Hello World模块的源代码及编译过程。该模块使用C语言编写，在加载时打印出运行信息及当前进程详情。

A simple kernel module for linux

/* hello.c
* Copyright (C) 1998 by Ori Pomerantz
*
* /"Hello, world/" - the kernel module version.
* fix history: wenxy 20070918, a.m. wen_kernel@163.com
*/

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
MODULE_LICENSE("GPL");

/* Initialize the module */
int init_module()
{
    printk("<1>Note: run .../n");
    printk("<1>Note: the process is %s [pid=%d]/n", current->comm, current->pid);


/* If we return a non zero value, it means that
   * init_module failed and the kernel module
   * can/'t be loaded */
return 0;
}

/* Cleanup - undid whatever init_module did */
void cleanup_module()
{
printk("<1>Note: exit/n");
}

# Makefile for a basic kernel module
# wenxy 20070919, a.m. wen_kernel@163.com
# Red hat linux 9.0, kernel version 2.4.20-8

# Makefile for a basic kernel module
# wenxy 20070919, a.m. wen_kernel@163.com

dir = /usr/src/linux-2.4/include
modules = hello.o
CC = gcc
MODCFLAGS = -Wall -DMODULE -D__KERNEL__ -DLINUX -I$(dir)

all : $(modules)

hello.o : hello.c
    $(CC) $(MODCFLAGS) -c hello.c
    chmod 711 $@


.PHONEY : clean run exit
run:
    insmod -f $(modules)

exit:
    rmmod hello

clean :
    -rm $(modules)


# end makefile

By the way,   use shell command "insmod -f hello.o" for load it to kernel, at last run shell command "rmmod hello" for unload it, and run shell command "lsmod" for show all kernel modules. That's all.