本文介绍了Swift:命令行工具退出回调的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
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")
从修改。
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