PennOS

PennOS is a small Unix-like operating system built for the University of Pennsylvania CIS 5480 operating systems course. It includes a cooperative threading-based kernel, process scheduling, job control, a shell, and a custom FAT-style file system called PennFAT.

This public repository contains executable builds only. The source code is intentionally omitted to comply with course academic integrity policies.

Authors

• Darren Wang
• Ronnie Wang

Project Highlights

• Interactive PennOS shell with foreground and background jobs
• Process lifecycle support, including spawning, waiting, exiting, stopping, continuing, and signaling
• Priority-based scheduler with scheduler event logging
• PennFAT file system with file creation, deletion, permissions, copying, moving, and listing
• Standalone PennFAT shell for creating and managing disk images

Included Files

bin/
  pennfat   Standalone PennFAT file system shell
  pennos    PennOS shell and scheduler executable

Running

From the repository root:

./bin/pennfat
./bin/pennos <fatfs> [log_file]

pennos expects a formatted PennFAT disk image as its first argument. The optional second argument sets the log output path.

Example

./bin/pennfat
pennfat# mkfs disk.fs 1024 1
pennfat# exit

./bin/pennos disk.fs log/log

Notes

• These binaries were built for the CIS 5480 project environment.
• If the executables do not run, make sure they have execute permissions:

chmod +x bin/pennfat bin/pennos