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Kernel Module: System Information Fetching

Description

This project involves implementing a Linux kernel module, named kfetch_mod, which serves as a character device driver. The module creates a device named /dev/kfetch, and a user-space program named kfetch can retrieve system information by reading from this device.

Features

  • Kernel Module: kfetch_mod is responsible for fetching system information and providing it to user-space.
  • Device Interface: A character device /dev/kfetch is created for accessing system information.
  • Customizable Information: Users can specify information they want to retrieve using a bitmask.
  • Device Operations: The module supports operations like open, release, read, and write.

System Information

The kernel module fetches the following system information:

  • Kernel: The kernel release version.
  • CPU: The CPU model name.
  • CPUs: The number of CPU cores.
  • Memory: Free and total memory.
  • Processes: The number of processes.
  • Uptime: System uptime.

Usage

Compile and Load Module:

  • Use make command to compile the kernel module.
  • Use make load to insert the kernel module.
  • Use make unload to remove the kernel module.

User-space Program (kfetch):

  • Compile the program using cc kfetch.c -o kfetch.
  • Run the program as root: sudo ./kfetch [options].

Options:

  • -a: Show all information.
  • -c: Show CPU model name.
  • -m: Show memory information.
  • -n: Show the number of CPU cores.
  • -p: Show the number of processes.
  • -r: Show the kernel release information.
  • -u: Show system uptime.

Example:

  • sudo ./kfetch -c -m: Display CPU model name and memory information.