/* foo.h
 *
 * author : marco corvi <marco_corvi@geocities.com>
 * date   : mar 2001
 *
 * 
 */
#ifndef FOO_H
#define FOO_H


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/wait.h>     /* wait_queue */
#include <linux/types.h>    /* ssize_t */
#include <linux/fs.h>       /* struct file, struct inode */
/* #include <asm/spinlock.h>   spinlock_t */


#define FOO_READ  0
#define FOO_WRITE 1

#ifdef __KERNEL__

struct foo_struct {
  int n_readers;          /* number of readers */
  int n_writers;          /* number of writers */
  int rpos;               /* read position */
  int wpos;               /* write position */
  int used;               /* used buffer */
  int max;                /* max buffer */
  unsigned char * buffer;
  /* struct wait_queue * wait; */
  wait_queue_head_t * wait; 
  spinlock_t lock;
};

#endif // __KERNEL__

int foo_trim( struct foo_struct * foo ); 
ssize_t foo_read(struct file * f, char * buf, size_t len, loff_t * );
ssize_t foo_write(struct file * f, const char * buf, size_t len, loff_t * );
int foo_open(struct inode * in, struct file * f); 
int foo_close(struct inode * in, struct file * f); 
int foo_flush(struct file * f); 
int foo_init(); 
void foo_exit(); 

#endif // FOO_H