How can I use the IOCTL number in the user space?

Question

As we know,I can get  an unique ioctl number in kernel space using the macros defined as following:

#define MYDRIVER_IOC_MAGIC  'g'
#define MYDRIVER_IOC_OP2  _IO(MYDRIVER_IOC_MAGIC,0)

but,how can I use the  MYDRIVER_IOC_OP2 in user space as the commands pass to ioctl()?

Answer 1

get it !

Answer 2

你一个人就是一台戏阿

Answer 3

楼上的说的是啊，发帖前先想想吧！

Answer 4

不就是个宏定义么。。。

Answer 5

Sorry,I have to admit that I am not a smart man.but I will do my best to study the things
what I like.
thanks all.