CPSC 457 Assignment 3

Auther: Chenzhe Qian

The file boot.sh is a script that initializes everything (i.e., copies files, compiles kernel, and starts UML)
The file fork.c contains the new system call.
The file user.c is a user-level C program that to call new-defined system call in UML.
The file unistd_64.h contains the modified info that invokes the new system call
The files sharedVmExample1.c and sharedVmExample1.c are two examples of processes sharing memory

IMPORTANT: The bonus part is NOT successful. It would run into infinite loop and crash the system.

The new system call scans the size of virtual memory used by a process

The following is usage for this assignment:
Set up UML:
./boot.sh

Mount remote directory:
mount none /home -t hostfs -o /[path of directory]

Copy unistd.h to /usr/include/asm-x86_64:
cp unistd.h /usr/include/asm-x86_64

Compile and run user level C program:
gcc -o user user.c
./user [UID]   --uid = -1 indicates to scan all users, -2 indicates to run bonus part

Compile and run two shared memory example:
gcc sharedVmExample1.c -o eg1   --eg1, create a process that sharing memory
./eg1 &
gcc sharedVmExample2.c -o eg2   --eg2, create a process that releasing the shared memory by eg1
./eg2 &


For test results, see 457_Assignment3_test.txt