struct file *do_filp_open(int dfd, struct filename *pathname, const struct open_flags *op) { /* 函数入口参数: * dfd = -100 * pathname.name = "/home/gaobsh/a.txt" * op 见 build_open_flags */ struct nameidata nd; int flags = op->lookup_flags; struct file *filp; set_nameidata...
AI代码解释 staticinline intksys_close(unsigned int fd){return__close_fd(current->files,fd);}int__close_fd(struct files_struct*files,unsigned fd){struct file*file;struct fdtable*fdt;spin_lock(&files->file_lock);// 获取文件描述符表fdt=files_fdtable(files);if(fd>=fdt->max_fds)goto ou...
1333 int (*flock) (struct file *, int, struct file_lock *); 1334 ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); 1335 ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned i nt); ...
static int m_log_open(struct inode *inode, struct file *filp) { struct m_log_device *m_log_dev; m_log_dev = container_of(filp->private_data, struct m_log_device, misc_dev); printk("open\n"); return 0; } filp->private_data 就是 miscdevice 的地址,struct m_log_device是驱动开发...
static int my_open(struct inode *inode, struct file *file) { return 0; } /** * 处理写操作的函数 * @param file 文件结构 * @param buf 来自用户空间的写入数据 * @param count 写入的数据长度 * @param ppos 文件偏移量 * @return 实际写入的字节数,错误时为负数 ...
系统中每个打开的文件在内核空间都有一个对应的file结构体。 struct file {struct path f_path; // 路径名称struct inode *f_inode; /*inode 指针*/const struct file_operations *f_op; // 文件操作集合unsigned int f_flags; // 标志位信息fmode_t f_mode; // 操作方式loff_t f_pos;struct fown_...
intxx_open(structinode inode ,structfile* filp) { structxx_dev *dev; dev = container_of(inode->i_cdev ,structxx_dev ,cdev); filp->private_data = dev ; return0; } 实现open与否,肯定是有不同的,具体不同体现在哪里呢? 可以看出,对驱动的xx_read、xx_write操作时,定位设备的方式产生了影响...
fdtable结构嵌入在files_struct中,并且由它的fdt指向。 struct fdtable { unsignedint max_fds; structfile __rcu **fd; /* current fd array*/ unsignedlong *close_on_exec; unsignedlong *open_fds; unsignedlong *full_fds_bits; structrcu_head rcu; ...
static int my_char_device_open(struct inode *inode, struct file *file) { // 初始化设备 printk(KERN_INFO "My char device opened\n"); try_module_get(THIS_MODULE); // 增加模块引用计数 return 0; } static struct file_operations fops = { .open = my_char_device_open, // 其他操作......
("<==SIPFW_ReadLine %d\n", count); return count; } // ssize_t SIPFW_WriteLine(struct file *f, char *buf, size_t len) // { // ssize_t count = -1; // mm_segment_t oldfs; // struct inode *inode; // DBGPRINT("==>SIPFW_WriteLine\n"); // if (!f || IS_ERR(f) ...