디바이스 드라이버 - insmod

-skeleton.c

#include <linux/module.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/fs.h>

int result;

static int sk_open(struct inode *inode, struct file *filp)

{

printk("device has been opened\n");

return 0;

}

static int sk_release(struct inode *inode, struct file *filp)

{

printk("device han been released\n");

return 0;

}

//c99 standard

struct file_operations sk_fops =

{

.owner = THIS_MODULE,

.open = sk_open,

.release = sk_release,

};

//#insmod skeleton.ko <- init_module()  

//          Linux 3.x <- 2.x

static int skeleton_init(void)

{

printk("skeleton init success\n");

result = register_chrdev(0,"skeleton",&sk_fops);

//include kernel.h

printk("major number : %d\n",result);

return 0;

}

//#rmmod skeleton <- cleanup_module()

static void skeleton_exit(void)

{

unregister_chrdev(result,"skeleton");

printk("skeleton exit success\n");

}

//include init.h

module_init(skeleton_init);

module_exit(skeleton_exit);

//include module.h

//open source(no free source)

MODULE_LICENSE("GPL");

-Makefile

KDIR = /lib/modules/$(shell uname -r)/build

PWD = $(shell pwd)

TARGET = skeleton

obj-m = $(TARGET).o

all :

$(MAKE) -C $(KDIR) M=$(PWD) modules

cp $(TARGET).ko ../

clean :

$(MAKE) -C $(KDIR) M=$(PWD) clean