SKQueue is a Swift libary used to monitor changes to the filesystem. It wraps the part of the kernel event notification interface of libc, kqueue. This means SKQueue has a very small footprint and is highly scalable, just like kqueue.


  • Swift tools version 4

To build in older environments just replace Package.swift with this file.


Swift Package Manager

To use SKQueue, add the code below to your dependencies in Package.swift. Then run swift package fetch to fetch SKQueue.

.package(url: "", from: "1.2.0"),


To monitor the filesystem with SKQueue, you first need a SKQueueDelegate instance that can accept notifications. Paths to watch can then be added with addPath, as per the example below.


import SKQueue

class SomeClass: SKQueueDelegate {
  func receivedNotification(_ notification: SKQueueNotification, path: String, queue: SKQueue) {
    print("\(notification.toStrings().map { $0.rawValue }) @ \(path)")

let delegate = SomeClass()
let queue = SKQueue(delegate: delegate)!

Action Sample output
Add or remove file in /Users/steve/Documents ["Write"] @ /Users/steve/Documents
Add or remove directory in /Users/steve/Documents ["Write", "SizeIncrease"] @ /Users/steve/Documents
Write to file /Users/steve/Documents/dog.jpg ["Rename", "SizeIncrease"] @ /Users/steve/Documents/dog.jpg


  1. Fork it!
  2. Create your feature branch: git checkout -b my-new-feature
  3. Commit your changes: git commit -am 'Add some feature'
  4. Push to the branch: git push origin my-new-feature
  5. Submit a pull request :D


Monitor changes to files and directories using kernel event notifications (kqueue) in Swift

Skqueue Info

⭐ Stars 84
🔗 Source Code
🕒 Last Update 5 months ago
🕒 Created 7 years ago
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😎 Author daniel-pedersen