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...
2)如果是64位的用户程序运行在64位的kernel上,调用的是unlocked_ioctl,如果是32位的用户程序运行在32位的kernel上,调用的也是unlocked_ioctl。 3. struct file_operations结构体 structfile_operations{structmodule*owner;loff_t(*llseek)(structfile*,loff_t,int);ssize_t(*read)(structfile*,char__user*,size...
struct file_operations是一个字符设备把驱动的操作和设备号联系在一起的纽带,是一系列指针的集合,每个被打开的文件都对应于一系列的操作,这就是file_operations,用来执行一系列的系统调用。 linux-2.6.22/include/linux/fs.h struct file_operations { struct module *owner; //防止模块还在被使用的时候被卸载 lof...
其中file->f_op = fop,将socket_file_ops传递给文件操作表 staticconststructfile_operationssocket_file_ops= { .owner = THIS_MODULE, .llseek = no_llseek, .read_iter = sock_read_iter, .write_iter = sock_write_iter, .poll = sock_poll, .unlocked_ioctl = sock_ioctl, #ifdef CONFIG_COMPAT ...
static unsigned int sock_poll(struct file *file, poll_table * wait) { struct socket *sock; /* * We can't return errors to poll, so it's either yes or no. */ sock = SOCKET_I(file->f_dentry->d_inode); /* 例子 tcp_poll */ ...
struct proc_dir_entry *pde = PDE(file_inode(file)); __poll_t rv = DEFAULT_POLLMASK; if (use_pde(pde)) { typeof_member(struct file_operations, poll) poll; typeof_member(struct proc_ops, proc_poll) poll; poll = pde->proc_fops->poll; poll = pde->proc_ops->proc_poll; if (...
const struct file_operations*f_op;spinlock_t f_lock;atomic_long_t f_count;unsigned int f_flags;fmode_t f_mode;loff_t f_pos;struct fown_struct f_owner;const struct cred*f_cred;struct file_ra_state f_ra;u64f_version;#ifdef CONFIG_SECURITY void*f_security;#endif void*private_data;#...
const struct inode_operations *i_op; const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ struct super_block *i_sb; struct file_lock *i_flock; struct address_space *i_mapping; struct address_space i_data; ...
structfile结构体定义在中,完整如下:引用structfile{union{structlist_headfu_list;structrcu_headfu_rcuhead;}f_u;structpathf_path;#definef_dentryf_path.dentry#definef_vfsmntf_path.mntconststructfile_operations*f_op;spinlock_tf_lock;atomic_long_tf_count;unsignedintf_flags;fmode_tf_mode;loff_tf_...
而file_operations 结构的每一个成员的名称都对应着一个系统调用。用户程序利用系统调用,比如在对一个设备文件进行诸如read操作时,这时对应于该设备文件的... 分享回复赞 兰赛普吧 eedless 浅谈结构体及Linux下内存分配原则结构体在程序中的应用是很广泛的,要处理的问题越复杂,数据量越多月杂,就越需要用到结构体...