在__dentry_open,通过关键语句,f->f_op = fops_get(inode->i_fop); 得到了具有一个指向struct file_operations结构的指针的struct file结构指针, 之后通过语句 if (!open && f->f_op) open = f->f_op->open; if (open) { error = open(inode, f); if (error) goto cleanup_all; } 调用我们...
该函数主要用于让用户省去操作cdev的操作,只需要提供**struct file_operations **变量就可以通过以下函数注册字符设备 staticinlineintregister_chrdev(unsignedintmajor,constchar*name, conststruct file_operations *fops) { return__register_chrdev(major,0,256, name, fops); } 其中函数__register_chrdev定义如下...
const struct file_operations *fops; struct list_head list; struct device *parent; struct device *this_device; const char *nodename; mode_t mode; }; scull 设备驱动只实现最重要的设备方法. 它的 file_operations 结构是如下初始化的: struct file_operations scull_fops = { .owner = THIS_MODULE,...
.owner是什么意思static struct file_operations dev_fops = {.owner = THIS_MODULE,.ioctl = sbc2440_leds_ioctl,};我知道owner,ioctl都是file_operations的成员,不明白前面要加个“.”的作用不是要问这个单词什么意思 相关知识点: 试题来源: 解析 没有特定的这种说法,要看上下文.feature可以解释为“专题”,...
const struct v4l2_file_operations *fops; /* sysfs */ struct device dev; /* v4l device */ struct cdev *cdev; /* character device */ /* Set either parent or v4l2_dev if your driver uses v4l2_device */ struct device *parent; /* device parent */ ...
1staticconststructfile_operations misc_fops ={2.owner =THIS_MODULE,3.open =misc_open,4}; 可以看到这里只有一个打开函数,用户打开miscdevice设备是通过主设备号对应的打开函数,在这个函数中找到次设备号对应的相应的具体设备的open函数。它的实现如下: ...
static struct file_operations dev_fops = { .owner = THIS_MODULE, .ioctl = sbc2440_leds_ioctl,};我知道owner,ioctl都是file_operations的成员,不明白前面要加个“.”的作用不是要问这个单词什么意思 扫码下载作业帮搜索答疑一搜即得 答案解析 查看更多优质解析 解答一 举报 没有特定的这种说法,要看上下文...
139 int globalmem_release(struct inode *inode,struct file *filp) 140 { 141 return 0; 142 } 143 static const struct file_operations globalmem_fops = 144 { 145 .owner = THIS_MODULE, 146 .open = globalmem_open, 147 .llseek = globalmem_llseek, ...
const struct file_operations *proc_fops, void *data) const struct proc_ops *proc_ops, void *data) { struct proc_dir_entry *p;BUG_ON(proc_fops == NULL);p = proc_create_reg(name, mode, &parent, data); if (!p) return NULL; ...
file *file, loff_t offset, int whence ); ssize_t my_read(structfile *file, char *buf, size_t count...structfile_operations my_fops = { owner: THIS_MODULE, llseek: my_llseek, read: my_read,...SEEK_CUR 偏移量设置为当前位置加上offset字节。 SEEK_END 偏移量设置为文件大小加上偏移字节...