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CSC3150 Assignment 1

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CSC3150 Assignment 1
Homework Requirements
Please note all bold fonts!!!!!!!!!
Environment
WARNING!!! Before starting this assignment, make sure you have set up your VM properly. We would
test all students’ homework using the following environment. You can type the following command in
terminal on your VM to see whether your configuration matches the test environment. If not, you can
still continue, but please try to test your program with the following environment at least once.
Because you may be able to run your program on your environment, but not on TAs’ environment,
causing inconvenience or even grade deduction.
If you follow the tutorials guidance, your VM setting should be fine. However, we also highly
recommend you to verify your environment again.
Linux Distribution: Ubuntu 20.04 (others are ok)
Linux Kernel Version: 5.10.x (Test Environment) (use uname -r to get it)
GCC Version: 4.9 above (use gcc -v to get it)
Makefile: Please write makefile to compile and install your program in this course. So please learn
how to write makefile. We only use makefile to test your program when we grade (If not used, this
program will have a score of 0, and it is not acceptable to use your own computer to run).
Code Style: Please use clang-format to format your code before submitting. (-10 points if not)
Submission
Due on: 23:59, 10 Oct 2022 (no late submission for any reason)
Please note that, teaching assistants may ask you to explain the meaning of your program, to ensure
that the codes are indeed written by yourself. Please also note that we would check whether your
program is similar to your peers’ code using plagiarism detectors.
Violation against the format requirements will lead to grade deduction.
Here is the format guide. The project structure is illustrated as below. You can also use tree command to
check whether your structure is fine. Structure mismatch would lead to grade deduction.
main@ubuntu:~/Desktop/Assignment_1_<student_id>$ tree
.
├── report.pdf
└── source
├── bonus
│ ├── Makefile
│ ├── pstree.c
│ └── <other_files>
├── program1
│ ├── abort.c
Please compress all files in the file structure root folder into a single zip file and name it using your
student id as the code showing below, for example, Assignment_1_118010001.zip. The report should
be submitted in the format of pdf, together with your source code. Format mismatch would cause grade
deduction(5 points deducted). Here is the sample step to compress your code.
Task 1 (30 points)
In this task, you should write a program ( program1.c ) that implement the functions below:
In user mode, fork a child process to execute the test program. (10 points)
When child process finish execution, the parent process will receive the SIGCHLD signal by wait()
function. (5 points)
There are 15 test programs provided. 1 is for normal termination, and the rest are exception cases.
Please use these test programs as your executing programs.
The termination information of child process should be print out. If normal termination, print normal
termination and exit status. If not, print out how did the child process terminates and what signal was
raised in child process. (15 points)
The main flow chart for Task 1 is:
│ ├── alarm.c
│ ├── bus.c
│ ├── floating.c
│ ├── hangup.c
│ ├── illegal_instr.c
│ ├── interrupt.c
│ ├── kill.c
│ ├── Makefile
│ ├── normal.c
│ ├── pipe.c
│ ├── program1.c
│ ├── quit.c
│ ├── segment_fault.c
│ ├── stop.c
│ ├── terminate.c
│ └── trap.c
└── program2
├── Makefile
├── program2.c
└── test.c
4 directories, <your_file_num> files
main@ubuntu:~/Desktop$ zip -q -r Assignment_1_<student_id>.zip
Assignment_1_<student_id>
main@ubuntu:~/Desktop$ ls
Assignment_1_<student_id> Assignment_1_<student_id>.zip
Demo outputs:
Demo output for normal termination:
main@ubuntu:~/Desktop/Assignment_1_example/source/program1$ ./program1 ./normal
Process start to fork
I’m the Parent Process, my pid = 4903
I’m the Child Process, my pid = 4904
Child process start to execute test program:
————CHILD PROCESS START————
This is the normal program
————CHILD PROCESS END————
Parent process receives SIGCHLD signal
Normal termination with EXIT STATUS = 0
Demo output for signaled abort:
Demo output for stopped:
Task 2 (60 points)
In this task, a template (“program2.c”) is provided. Within the template, please implement the functions
below:
When program2.ko being initialized, create a kernel thread and run my_fork function. (10 points)
Within my_fork, fork a process to execute the test program. (10 points)
The parent process will wait until child process terminates. (10 points)
Print out the process id for both parent and child process. (5 points)
Within this test program, it will raise signal. The signal could be caught and related message should be
printed out in kernel log. (10 points)
Follow the hints below to implement your function. If the function is non-static, you should firstly
export this symbol so that it could be used in your own kernel module. After that, you should compile
the kernel source code and install it. (Kernel compile: 15 points)
Hints:
Use “kernel_thread” or “kernel_clone” to fork a new process.
Use “do_execve” to execute the test program.
main@ubuntu:~/Desktop/Assignment_1_example/source/program1$ ./program1 ./abort
Process start to fork
I’m the Parent Process, my pid = 4908
I’m the Child Process, my pid = 4909
Child process start to execute test program:
————CHILD PROCESS START————
This is the SIGABRT program
Parent process receives SIGCHLD signal
child process get SIGABRT signal
main@ubuntu:~/Desktop/Assignment_1_example/source/program1$ ./program1 ./stop
Process start to fork
I’m the Parent Process, my pid = 4931
I’m the Child Process, my pid = 4932
Child process start to execute test program:
————CHILD PROCESS START————
This is the SIGSTOP program
Parent process receives SIGCHLD signal
child process get SIGSTOP signal
Use “getname_kernel” to get filename.
Use “do_wait” to wait for child process’ termination status.
The main flow chart for Task 2 is:
Demo output(Please output your name and student id when module init):
[ 3769.385776] [program2] : module_init {name} {student id}
[ 3769.385777] [program2] : module_init create kthread start
[ 3769.385777] [program2] : module_init kthread start
[ 3769.389787] [program2] : The child process has pid = 2914
[ 3769.389793] [program2] : This is the parent process, pid = 2912
[ 3769.391602] [program2] : child process
[ 3769.391604] [program2] : get SIGTERM signal
[ 3769.391605] [program2] : child process terminated
[ 3769.391605] [program2] : The return signal is 15
[ 3773.346070] [program2] : module_exit./my
Note: the variable path in my_exec() in program2.c should be /tmp/test before submitting your
homework, otherwise your grade would be influenced seriously.
Bonus Task (10 pionts)
There is a linux command, called pstree , which could print out the process tree of linux, as below:
In this task, we need to create a file to implement this function and the file name is pstree.c . There are
many options of pstree . You can use man pstree to discover it. Before implementing this program, I
suggest that use this command by yourself to see how it works.
The grading criteria:
The program can output a process tree as above. (5 points)
You will receive one point for each option implemented. So if you want to get 10 points in bonus, you
need to implement another 5 options of pstree .
You cannot call the pstree command directly in your program.
Hints: This reference(https://en.wikipedia.org/wiki/Procfs) might help you to finish the bonus task.
Report (10 points)
Write a report for your assignment, which should include main information as below:
Your name and student id.
How did you design your program? (4 points)
How to set up your development environment, including how to compile kernel? (2 points)
Screenshot of your program output. (2 points)
What did you learn from the tasks? (2 points)
Please note that the report will only be graded if your total score for Task 1 and Task 2 exceeds 54
points.
❯ pstree
systemd─┬─NetworkManager───2*[{NetworkManager}]
├─abrt-watch-log
├─abrtd
├─agetty
├─atd
├─auditd───{auditd}
├─blackbox_export─┬─run_blackbox_ex───tee
│ └─75*[{blackbox_export}]
Completion Marks
Bonus 10 Points
Report 10 Points
Completed with good quality 80 ~ 90
Completed accurately 80 +
Fully Submitted (compile successfully) 60 +
Partial submitted 0 ~ 60
No submission 0
Late submission Not Allowed
Grading rules
Here is a sample grading scheme. Different from the points specified above, this is the general guide when
TA’s grading.
References
https://www.gnu.org/software/libc/manual/html_node/Process-Identification.html
https://elixir.bootlin.com/linux/v5.10/source (This one can help you to search symbols in the kernel.)
https://seisman.github.io/how-to-write-makefile/ (Chinese)
https://makefiletutorial.com/

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