This repository contains all of my assignment solutions for the Operating Systems course at IIT Kanpur for the odd semester of 2018-19. This course was done under Prof. Debadatta Mishra. The course webpage is hosted here (as of 2018-12-08).

The first 3 assignments consist of development on an OS made using the gem5 architectural simulator. This OS will be referred to as gemOS. Instructions for setting up gemOS is given in this pdf.

• Assignment 1: Virtual memory and paging for gemOS.
• Assignment 2: System call implementations for gemOS.
• Assignment 3: Signal handling, sleeping and process scheduling for gemOS.
• Assignment 4: A FUSE filesystem acting as an object-store i.e. only files allowed - no directories at all, except the root directory.

I could not build gem5 on my system (Arch Linux), so I created a Dockerfile for building and running gemOS.

• Building the gemOS image:

  docker build -t gem5 .
  

• Starting a gemOS container:

  docker run -dit --name gemos --rm=true -p 1234:3456 -v /mnt/Data/gem5:/root/gem5 -e M5_PATH=\"/root/gem5/gemos\" -e GEM5_LOC=\"/root/gem5\" gem5
  

  Here, /mnt/Data/gem5 is the path to where I've cloned the gem5 repository on my system. Replace it with the path to your cloned gem5 repository.

• Stopping the gemOS container:

  docker kill gemos
  

• Building gem5 on the gemOS container:

  docker exec -t /bin/bash gemos
  

  Then, once inside the gemOS container, go to /root/gem5 and follow the instructions in the howto pdf to build gem5.

• Opening the gemOS shell on the gemOS container:

  telnet localhost 1234