Shell from scratch

Project
A simple, unix-based shell with the following command schema:
[STILL FIXING BUGS, NOT COMPLETE]

TO RUN: gcc shell.c file_handler.c parser.c pcb.c scheduler.c -o shell.exe

TYPE	OPERATION	ARGS	NOTES	IMPLEMENTED
file	list	NONE	List all files	YES
file	print	NONE	Print the current path	YES
file	enter	directory	Go into a directory	YES
file	makedir	name	Make a new directory	YES
file	makefile	name	Make a new file in curr directory	YES
system	status	NONE	Get current running processes	YES
system	queue_status	NONE	Get current queue processes	YES
system	start	uid, priority, core, time	Returns a hash to id the process	YES
system	kill	uid	Ends the given process	YES

The "system" module that the shell uses is a mock process manager built from scratch. It does not actually make any new system processes.

Scope of the Process Manager

• Get current processes
• Get specs, like how many processes can run, etc
• Start a new process
• Kill a given process

Architecture of the Process Manager

PCB (Process Control Block)

Represents a single process, contains information on it like id, priority, cpu requirements, etc Also updates state

Scheduler

Puts jobs in the execution queue

Context Switcher

Used to move a process into idle mode or running mode

Hierarchy Manager

Handles parent and children processes