racheesingh / cse506 Goto Github PK

Preemptive OS, 70 points

Team:

• Rachee Singh ([email protected])
• Emaad Ahmed Manzoor ([email protected])

• Round-robin preemptive scheduling
• COW fork
• Auto-growing stack
• Graceful SEGV handling

• 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 <pid>
• Sleep for n seconds with sleep <n>
• 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 <filepath>
• Clear the screen with clear
• The terminal auto-scrolls!

• The mechanism of setting up the first process's stack was adopted from xv6 (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.