2023-07-07 10:30:32 +05:30
|
|
|
As we conclude, here is a list of questions for you to test your knowledge
|
|
|
|
|
regarding this chapter's material. You will find answers to selected
|
|
|
|
|
questions here:
|
|
|
|
|
https://github.com/PacktPublishing/Linux-Kernel-Programming/tree/master/solutions_to_assgn
|
|
|
|
|
|
|
|
|
|
Chapter 4 : Questions and/or Assignments
|
|
|
|
|
|
|
|
|
|
1. Does the Linux kernel follow the monolithic or microkernel architecture?
|
|
|
|
|
|
|
|
|
|
2. Name a few of the subsystems within the kernel.
|
|
|
|
|
|
|
|
|
|
3. Would you architect a device driver as a separate kernel module or build it
|
|
|
|
|
into the kernel itself, and why?
|
|
|
|
|
|
|
|
|
|
4. Can a kernel module be used to create a new CPU scheduler on Linux?
|
|
|
|
|
|
|
|
|
|
5. (a) Spot the error in the following line of code:
|
2023-12-18 07:38:51 +05:30
|
|
|
printk(KERN_CRIT, "Goodbye, world, climate change's a bummer...\n");
|
|
|
|
|
(Hint: it's not 'climate change'; that's real and we need to fix it!).
|
2023-07-07 10:30:32 +05:30
|
|
|
(b) What's the fix?
|
|
|
|
|
|
|
|
|
|
6. How does the kernel build system know the location of the kernel headers?
|
|
|
|
|
|
|
|
|
|
7. (a) Spot the errors in the following lines of code:
|
|
|
|
|
static int __init wow_an_lkm_init(void *msg)
|
|
|
|
|
{
|
|
|
|
|
pr_inform("Am intializing...[%d]\n");
|
|
|
|
|
}
|
|
|
|
|
(b) What're the fixes?
|
|
|
|
|
|
|
|
|
|
8. Why don't insmod or rmmod work unless we run with root privileges?
|
|
|
|
|
|
|
|
|
|
9. Is there an alternate way to use the insmod or rmmod kernel modules (that
|
|
|
|
|
is, without root)?
|
|
|
|
|
|
|
|
|
|
10. Running in the Linux graphical environment, we don't see the output
|
|
|
|
|
of printk but can see the output of printf; how come? Where has the
|
|
|
|
|
printk output gone?
|
|
|
|
|
|
|
|
|
|
11. How can we guarantee seeing printk output on the console device?
|
|
|
|
|
|
