https://github.com/emaadmanzoor/cse506

CockroachOS: A resilient OS from scratch
https://github.com/emaadmanzoor/cse506

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CockroachOS: A resilient OS from scratch

• Host: GitHub
• URL: https://github.com/emaadmanzoor/cse506
• Owner: emaadmanzoor
• License: other
• Created: 2015-09-05T20:22:20.000Z (over 9 years ago)
• Default Branch: w2
• Last Pushed: 2015-12-05T20:31:40.000Z (about 9 years ago)
• Last Synced: 2024-04-16T01:44:31.120Z (8 months ago)
• Language: C
• Homepage:
• Size: 340 KB
• Stars: 0
• Watchers: 3
• Forks: 1
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
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CockroachOS 

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*Preemptive OS, 70 points*

Team:

   * Rachee Singh ([email protected])

   * Emaad Ahmed Manzoor ([email protected])

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Features

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## Kernel

   * Round-robin preemptive scheduling

   * COW fork

   * Auto-growing stack

   * Graceful SEGV handling

## Userspace

   * Available binaries: `kill`, `sleep`, `ls`, `ps`, `echo`, `cat`, `infinite`, `tests`

   * C standard library

   * Execute background processes with `&`

   * View running processes with `ps`

   * Kill a foreground running process with `^C`

   * Kill a background running process with `kill -9 `

   * Sleep for `n` seconds with `sleep `

   * Run an infinite loop with `infinite` (useful to test `ps`, `kill` and `^C`)

   * View files in the current directory with `ls`, change directory with `cd` (you can `ls`, but cannot `cd` to `/`!)

   * Print a file to the screen with `cat `

   * Clear the screen with `clear`

   * The terminal auto-scrolls!

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Acknowledgements

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   * The mechanism of setting up the first process's stack was adopted from [xv6](https://pdos.csail.mit.edu/6.828/2014/xv6/book-rev8.pdf) (commentary on a 32-bit open-source OS).

   * User space `malloc` is based on the implementation in K&R's C Programming Language.

   * The interrupt handling mechanism (offloading to a generic handler) is based on the ideas from https://littleosbook.github.io/.

   * Referred standard resources have been cited inline with the code.