Linux 设备驱动

struct file_operations {
  struct module *owner;
  loff_t (*llseek) (struct file *, loff_t, int);
  ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
  ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
  int (*mmap) (struct file *, struct vm_area_struct *);
  unsigned long mmap_supported_flags;
  int (*open) (struct inode *, struct file *);
  int (*release) (struct inode *, struct file *);
  int (*flush) (struct file *, fl_owner_t id);
  int (*fsync) (struct file *, loff_t, loff_t, int datasync);
  int (*lock) (struct file *, int, struct file_lock *);
  ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
  long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
  long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
  int (*flock) (struct file *, int, struct file_lock *);
  ...

long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
long (*compat_ioctl) (struct file *, unsigned int, unsigned long);