我正在用 swift 编写一个 macOS 命令行工具,它执行 shell 命令:
let process = Process()
process.launchPath = "/bin/sleep"
process.arguments = ["100"]
process.launch()
process.waitUntilExit()
但是,如果中断 (CTRL-C
) 或终止信号发送到我的程序,这些 shell 命令不会终止,而是继续执行。
如果我的程序意外终止,有没有办法自动终止它们?
最佳答案
以下是我们在使用两个管道子进程时对中断 (CTRL-C
) 使用react所做的操作。
背后的想法:阻塞waitUntilExit()
调用替换为异步terminationHandler
。无限循环 dispatchMain()
用于服务调度事件。收到 Interrupt
信号后,我们在子进程上调用 interrupt()
。
封装子进程启动和中断逻辑的示例类:
class AppTester: Builder {
private var processes: [Process] = [] // Keeps references to launched processes.
func test(completion: @escaping (Int32) -> Void) {
let xcodebuildProcess = Process(executableName: "xcodebuild", arguments: ...)
let xcprettyProcess = Process(executableName: "xcpretty", arguments: ...)
// Organising pipe between processes. Like `xcodebuild ... | xcpretty` in shell
let pipe = Pipe()
xcodebuildProcess.standardOutput = pipe
xcprettyProcess.standardInput = pipe
// Assigning `terminationHandler` for needed subprocess.
processes.append(xcodebuildProcess)
xcodebuildProcess.terminationHandler = { process in
completion(process.terminationStatus)
}
xcodebuildProcess.launch()
xcprettyProcess.launch()
// Note. We should not use blocking `waitUntilExit()` call.
}
func interrupt() {
// Interrupting running processes (if any).
processes.filter { $0.isRunning }.forEach { $0.interrupt() }
}
}
用法(即main.swift
):
let tester = AppTester(...)
tester.test(....) {
if $0 == EXIT_SUCCESS {
// Do some other work.
} else {
exit($0)
}
}
// Making Interrupt signal listener.
let source = DispatchSource.makeSignalSource(signal: SIGINT)
source.setEventHandler {
tester.interrupt() // Will interrupt running processes (if any).
exit(SIGINT)
}
source.resume()
dispatchMain() // Starting dispatch loop. This function never returns.
shell 中的输出示例:
...
▸ Running script 'Run Script: Verify Sources'
▸ Processing Framework-Info.plist
▸ Running script 'Run Script: Verify Sources'
▸ Linking AppTestability
^C** BUILD INTERRUPTED **
关于swift - 在 Swift 中终止 macOS 命令行工具的子进程,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/52786443/