Linux Device Drivers, Chapter 6

Reading

ioctl Section (pg 135 - 147)

Study Questions

1. Why is the ioctl interface used for?

2. Is ioctl used to read or write data? How much data?

3. Why is ioctl sometimes disliked by kernel developers?

4. How are ioctl command numbers constructed?

5. (T/F) If you don’t follow convention in creating your ioctl numbers, the kernel will reject your ioctl command.

6. (T/F) The user-provided pointers need to be validated before being used by the kernel.

7. (T/F) You can design drivers to control devices without using the ioctl mechanism.