CODEWITHSUNDEEP
ubuntu-10.04kernel-moduleioctl
Dalchand
Dalchand

Reputation: 223

Using ioctl communication between Kernel mode and user mode

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

Upvotes: 17

Views: 16524

Answers (2)

kumar
kumar

Reputation: 41

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

Upvotes: 4

Eugene
Eugene

Reputation: 6097

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.

Upvotes: 23

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