struct file_operation{
int (*lseek)(struct inode *inode, struct file *filp, off_t off, int pos);
int (*read)(struct inode *inode, struct file *filp, char *buf, int count);
int (*write)(struct inode *inode, struct file *filp, const char *buf, int count);
int (*readdir)(struct inode *inode, struct file *filp, struct dirent *dirent, int count);
int (*select)(struct inode *inode, struct file *filp, int sel_type, select_table *wait);
int (*ioctl)(struct inode *inode, struct file *filp, unsigned int cmd, unsigned int arg);
int (*mmap)(void);
int (*open)(struct inode *inode, struct file *filp);
int (*release)(struct inode *inode, struct file *filp);
int (*fasync)(struct inode *inode, struct file *filp);
};
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