How to Add a system call to xv6 kernel
In this project, we add a system call to XV6 kernel that prints a list of running processes (like ps command in linux). Then we write a program that makes five children and waits until all children are finished.
sudo apt-get install qemu-kvm
sudo apt-get install git git clone https://github.com/mit-pdos/xv6-public.git
cd xv6-public
make qemu-nox
Exit qemu and go to your shell:
C-a x
1-Add the system call number (22) to syscall.h file
2-Add function prototype to user.h file
3- Add function prototype to defs.h file
4-Write function body in proc.c
5-Write a function that calls your function in sysproc.c
6-write SYSCALL in usys.S
7-Add a pointer and a prototype to syscall.c
8-Write a C code that calls your function in ps.c
9- Write a C code (dpro.c) to use ps system call
10-change makefile to this:
11-Run the commands:
Make clean
Make qemu nox
Ps
