最終更新:2013-01-06 (日) 06:40:34 (4145d)
file_operations
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Linux 2.6.18での定義
/* * NOTE: * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl * can be called without the big kernel lock held in all filesystems. */ 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 (*aio_read) (struct kiocb *, char __user *, size_t, loff_t); ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); ssize_t (*aio_write) (struct kiocb *, const char __user *, size_t, loff_t); int (*readdir) (struct file *, void *, filldir_t); unsigned int (*poll) (struct file *, struct poll_table_struct *); int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long); long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); long (*compat_ioctl) (struct file *, unsigned int, unsigned long); int (*mmap) (struct file *, struct vm_area_struct *); int (*open) (struct inode *, struct file *); int (*flush) (struct file *, fl_owner_t id); int (*release) (struct inode *, struct file *); int (*fsync) (struct file *, struct dentry *, int datasync); int (*aio_fsync) (struct kiocb *, int datasync); int (*fasync) (int, struct file *, int); int (*lock) (struct file *, int, struct file_lock *); ssize_t (*readv) (struct file *, const struct iovec *, unsigned long, loff_t *); ssize_t (*writev) (struct file *, const struct iovec *, unsigned long, loff_t *); ssize_t (*sendfile) (struct file *, loff_t *, size_t, read_actor_t, void *); ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); int (*check_flags)(int); int (*dir_notify)(struct file *filp, unsigned long arg); int (*flock) (struct file *, int, struct file_lock *); ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); };
ハンドラ
主な奴
一覧
- llseek?
- read
- aio_read?
- write
- aio_write?
- readdir
- poll
- ioctl
- unlocked_ioctl
- compat_ioctl?
- mmap
- open
- flush?
- release
- fsync?
- aio_fsync?
- fasync?
- lock
- readv?
- writev?
- sendfile?
- sendpage?
- get_unmapped_area?
- check_flags?
- flock?
- splice_write?
- splice_read?
- setlease?
- fallocate
使い道
register_chrdev
- キャラクタデバイスの登録
static inline int register_chrdev(unsigned int major, const char *name,const struct file_operations *fops)
- アプリケーションが対応するシステムコールをコールした際の対応ハンドラを指定する
関連
参考
http://www.coins.tsukuba.ac.jp/~yas/coins/os2-2009/2010-02-16/index.html