https://github.com/nelsbrock/dev-fibonacci

A Linux driver for a device which outputs the Fibonacci series.
https://github.com/nelsbrock/dev-fibonacci

Last synced: 5 days ago
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A Linux driver for a device which outputs the Fibonacci series.

• Host: GitHub
• URL: https://github.com/nelsbrock/dev-fibonacci
• Owner: nelsbrock
• License: mit
• Created: 2024-05-10T19:35:33.000Z (6 months ago)
• Default Branch: main
• Last Pushed: 2024-05-10T20:32:05.000Z (6 months ago)
• Last Synced: 2024-05-10T21:43:57.565Z (6 months ago)
• Language: C
• Size: 2.93 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# /dev/fibonacci

Just playing around with Linux Kernel Module programming.

## What is this?

A Linux driver for a device which outputs the Fibonacci series.

## Usage

*Disclaimer:* You should probably run this kernel module in a virtual machine,

as it is literally running in kernel-space, and I don't consider my Linux kernel

module programming experience high enough to confidently claim that this won't

wreak complete havoc on your machine. It works on my machine, though.

### Building

Clone this repository, `cd` to it, then run `make`.

### Loading

After building the module, run `insmod fibonacci.ko` with root privileges to

load it.

### Using the device

After loading the module, you can read the Fibonacci series from

`/dev/fibonacci` (you'll probably need root privileges to access the device):

```sh

head -n 12 /dev/fibonacci

```

Output:

```

0

1

1

2

3

5

8

13

21

34

55

89

```

### Unloading

Run `rmmod fibonacci` with root privileges to unload the module.

## Notes

- The `fibonacci` device can only be read from the beginning. Reading from an

  offest results in errno `EINVAL` being returned ("Invalid argument").

- Fibonacci numbers are internally represented as `long long unsigned` and

  output is terminated when an overflow occurs.