在 Swift 命令行应用程序中捕获信号 [英] Trapping signals in a Swift command line application

问题描述

如何在 Swift 中正确捕获 SIGINT 和 SIGTERM 等不同信号?例如，当人们通过按 Control-C 停止我的脚本时，我想在终止它之前做一些清理.

How to capture different signals such as SIGINT and SIGTERM in Swift correctly? For example, when people stop my script by pressing Control-C, I want to do some cleanup before terminating it.

推荐答案

调度源可用于监视 UNIX 信号.

Dispatch Sources can be used to monitor UNIX signals.

这是一个简单的例子，一个 Swift 3 中 C 代码的翻译监控信号"部分来自并发编程指南.

Here is a simple example, a Swift 3 translation of the C code in the "Monitoring Signals" section from the Concurrency Programming Guide.

import Dispatch // or Foundation

signal(SIGINT, SIG_IGN) // // Make sure the signal does not terminate the application.

let sigintSrc = DispatchSource.makeSignalSource(signal: SIGINT, queue: .main)
sigintSrc.setEventHandler {
    print("Got SIGINT")
    // ...
    exit(0)
}
sigintSrc.resume()

请注意，这需要一个活动的 GCD 事件循环，例如与

Note that this requires an active GCD event loop, e.g. with

dispatchMain()

在命令行程序中.

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