Swift：命令行工具退出回调 [英] Swift: command line tool exit callback

问题描述

我需要知道用户何时停止了命令行程序，以从命令行程序（在终端上运行）释放一些活动的蓝牙连接，并且写得很快。

I need to know when a command line program is stopped by the user to release some active bluetooth connections from a command-line program (running on the terminal), written in swift.

说用户调用程序，然后按ctrl + Z退出。
我怎么知道？

Say the user calls the program then exits by pressing ctrl+Z. How would I know ?

推荐答案

您可以使用Swift安装信号处理程序。例如：

You can install a signal handler with Swift. For example:

import Foundation

let startTime = Date()
var signalReceived: sig_atomic_t = 0

signal(SIGINT) { signal in signalReceived = 1 }

var i = 0
while true {
    if signalReceived == 1 { break }
    usleep(500_000)
    if signalReceived == 1 { break }
    i += 1
    print(i)
}

let endTime = Date()
print("Program has run for \(endTime.timeIntervalSince(startTime)) seconds")

从此要点修改。

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