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Swift System provides idiomatic interfaces to system calls and low-level currency types.
.package(url: "https://github.com/apple/swift-system.git", from: "0.0.1")

Swift System

Swift System provides idiomatic interfaces to system calls and low-level currency types. Our vision is for System to act as the single home for low-level system interfaces for all supported Swift platforms.

Multi-platform not Cross-platform

System is a multi-platform library, not a cross-platform one. It provides a separate set of APIs and behaviors on every supported platform, closely reflecting the underlying OS interfaces. A single import will pull in the native platform interfaces specific for the targeted OS.

Our immediate goal is to simplify building cross-platform libraries and applications such as SwiftNIO and SwiftPM. System does not eliminate the need for #if os() conditionals to implement cross-platform abstractions, but it does make it safer and more expressive to fill out the platform-specific parts.


import SystemPackage

let message: String = "Hello, world!" + "\n"
let path: FilePath = "/tmp/log"
let fd = try FileDescriptor.open(
  path, .writeOnly, options: [.append, .create], permissions: .ownerReadWrite)
try fd.closeAfter {
  _ = try fd.writeAll(message.utf8)

Adding SystemPackage as a Dependency

To use the SystemPackage library in a SwiftPM project, add the following line to the dependencies in your Package.swift file:

.package(url: "https://github.com/apple/swift-system", from: "0.0.1"),

Because SystemPackage is under active development, source-stability is only guaranteed within minor versions (e.g. between 0.0.3 and 0.0.4). If you don't want potentially source-breaking package updates, use this dependency specification instead:

.package(url: "https://github.com/apple/swift-system", .upToNextMinor(from: "0.0.1")),

Finally, include "SystemPackage" as a dependency for your executable target:

let package = Package(
    // name, platforms, products, etc.
    dependencies: [
        .package(url: "https://github.com/apple/swift-system", from: "0.0.1"),
        // other dependencies
    targets: [
        .target(name: "MyTarget", dependencies: [
            .product(name: "SystemPackage", package: "swift-system"),
        // other targets


Before contributing, please read CONTRIBUTING.md.


See LICENSE for license information.


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iOS Software Engineer @ Perry Street Software
Perry Street Software is Jack’d and SCRUFF. We are two of the world’s largest gay, bi, trans and queer social dating apps on iOS and Android. Our brands reach more than 20 million members worldwide so members can connect, meet and express themselves on a platform that prioritizes privacy and security. We invest heavily into SwiftUI and using Swift Packages to modularize the codebase.

Release Notes

System 0.0.1
33 weeks ago

Initial release

Swiftpack is being maintained by Petr Pavlik | @ptrpavlik | @swiftpackco | API