class_create()

从linux内核2.6的某个版本之后，devfs不复存在，udev成为devfs的替代。相比devfs，udev有很多优势， 在此就不罗嗦了，提醒一点，udev是应用层的东东，不要试图在内核的配置选项里找到它;加入对udev的 支持很简单，以作者所写的一个字符设备驱动为例，在驱动初始化的代码里调用class_create为该设备 创建一个class，再为每个设备调用 class_device_create创建对应的设备。大致用法如下： struct class *myclass = class_create(THIS_MODULE, “my_device_driver”); class_device_create(myclass, NULL, MKDEV(major_num, 0), NULL, “my_device”); 这样的module被加载时，udev daemon就会自动在/dev下创建my_device设备文件。 class_create() ------------------------------------------------- linux-2.6.22/include/linux/device.h struct class *class_create(struct module *owner, const char *name)     class_create - create a struct class structure     @owner: pointer to the module that is to "own" this struct class     @name: pointer to a string for the name of this class. 在/sys/class/下创建类目录 class_device_create() ------------------------------------------------- linux-2.6.22/include/linux/device.h struct class_device *class_device_create(struct class        *cls,                                          struct class_device *parent,                                          dev_t               devt,                                          struct device       *device,                                          const char          *fmt, ...)     class_device_create - creates a class device and registers it with sysfs     @cls: pointer to the struct class that this device should be registered to.     @parent: pointer to the parent struct class_device of this new device, if any.     @devt: the dev_t for the char device to be added.     @device: a pointer to a struct device that is assiociated with this class device.     @fmt: string for the class device's name  转于：http://hi.baidu.com/zengzhaonong/blog/item/4c937c2714a32c07918f9d9d.html