#ifndef __CIRCULAR_BUF_H__#define	__CIRCULAR_BUF_H__#include <linux/slab.h>struct circular_buffer{	unsigned int size;	unsigned int in;	unsigned int out;	char *buffer;};void init_circular_buf(struct circular_buffer *buf, int size);//yangxingvoid clear_circular_buf(struct circular_buffer *buf);//yangxing//void init_circular_buf(struct circular_buffer *buf);void free_circular_buf(struct circular_buffer *buf);int write_to_circular_buf(struct circular_buffer *buf, char __user *pdata, int count);int read_from_circular_buf(struct circular_buffer *buf, char __user *pdata, int count);int read_circular_buf_1(struct circular_buffer *buf, char *pdata);int write_circular_buf_1(struct circular_buffer *buf, char data);int can_circular_buf_write(struct circular_buffer *buf);int can_circular_buf_read(struct circular_buffer *buf);//yangxingint write_circular_buf(struct circular_buffer *buf, char *pdata, int count);int read_circular_buf(struct circular_buffer *buf, char *pdata, int count);#endif