Using ioctl communication between Kernel mode and user mode

Question

I want to communicate with my kernel module using ioctl. I have written two c program one for kernel module and other for user mode. I am getting this error while compiling kernel module:

error: unknown field ‘ioctl’ specified in initializer

at this line :

struct file_operations Fops = {
 .read = device_read,
 .write = device_write,
 .ioctl = device_ioctl,  ------> at this point error is occuring.
 .open = device_open,
 .release = device_release,
};

any idea why this is happening.

thanks

score 23 · Accepted Answer · edited Apr 13 '17 at 12:36

23

In newer kernels, the preferred way is to use .unlocked_ioctl or .compat_ioctl fields. The plain .ioctl was removed from struct file_operations. This discussion may clarify what happened and how to deal with that.

edited Apr 13 '17 at 12:36

Community

1
1

answered May 04 '11 at 04:25

Eugene

5,977
2
29
46

score 4 · Answer 2 · edited Apr 29 '14 at 08:50

4

In newer kernels, use .unlocked_ioctl in the place of .ioctl. It works fine.

edited Apr 29 '14 at 08:50

nondefaultname

55
8

answered Oct 16 '12 at 19:08

kumar

41
1

Using ioctl communication between Kernel mode and user mode

2 Answers2