Circular Queue Character Device Driver

Minimal Linux character device implementing a FIFO circular queue (no locking)

A simple Linux kernel character device that implements a fixed-size circular queue with no locking.

This module allows user-space programs to write bytes into a kernel buffer and read them back in FIFO order.

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Features

• Character device driver
• Circular buffer of 256 bytes
• FIFO read/write behavior
• No locking (single-producer/single-consumer or non-concurrent use only)
• Minimal and easy to understand

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Build

Make sure you have kernel headers installed.

make

Load the Module

sudo insmod circular_queue.ko
dmesg | tail

Create a Device Node

sudo mknod /dev/circular_queue c <MAJOR_NUMBER> 0
sudo chmod 666 /dev/circular_queue

Usage Write to device

echo "hello world" > /dev/circular_queue

Read from device

cat /dev/circular_queue

OUTPUT: hello world