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Listing 4. The file_operations Structure

struct file_operations {
    int (*lseek) (struct inode *, struct file *,
	 off_t, int);
    int (*read) (struct inode *, struct file *,
	 char *, int);
    int (*write) (struct inode *, struct file *,
	 const char *, int);
    int (*readdir) (struct inode *, struct file *,
	 void *, filldir_t);
    int (*select) (struct inode *, struct file *,
	 int, select_table *);
    int (*ioctl) (struct inode *, struct file *,
	 unsigned int, unsigned long);
    int (*mmap) (struct inode *, struct file *,
	 struct vm_area_struct *);
    int (*open) (struct inode *, struct file *);
    void (*release) (struct inode *,
	 struct file *);
    int (*fsync) (struct inode *, struct file *);
    int (*fasync) (struct inode *, struct file *,
	 int);
    int (*check_media_change) (kdev_t dev);
    int (*revalidate) (kdev_t dev);
};