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.