Kernel Development Learning Pipeline

Lecture 15: Wednesday, 24 July 2024

Announcements

1. E2 due next week

2. P2 due in two weeks

Review

1. In L14 we covered:

   1. Extended file_operations with write(2), ioctl(2), and llseek(2)

   2. Introduced the jiffies counter and HZ constant

   3. Discussed the device class system and struct device

   4. Overview of MIDI and our simplification

   5. Worked through the design and implementation of kkey

   6. Listened to the sound of the kernel

Lecture overview

1. Class files in sysfs

2. Mutexes in the kernel

3. Atomic types in the kernel

4. Triggering a race

5. Preventing the race

Slides

Character Devices 3