scull.h

一个模拟的字符驱动程序

# vi scull.h

#ifndef _SCULL_H_

#define _SCULL_H_

#include <linux/ioctl.h> 

 

#define SCULL_MAJOR  0 

#define SCULL_NR_DEVS  4 

#define SCULL_DATA_SIZE  16

 

struct scull_dev {

 char data[SCULL_DATA_SIZE]; 

 unsigned long size; 

 struct semaphore sem; 

 struct cdev cdev; 

}; 

 

extern int scull_major; 

extern int scull_nr_devs;

 

int scull_trim(struct scull_dev *dev);

int  scull_open(struct inode *inode, struct file *filp);

int  scull_release(struct inode *inode, struct file *filp);

ssize_t scull_read(struct file *filp, char __user *buf, size_t count,loff_t *f_pos);

ssize_t scull_write(struct file *filp, const char __user *buf, size_t count,loff_t *f_pos);

loff_t scull_llseek(struct file *filp, loff_t off, int whence);

 

#endif