从 Scala 终止挂起的进程

发布于 2024-11-02 09:20:45 字数 390 浏览 0 评论 0原文

我的代码必须调用一些有时会挂起的外部程序。（无限循环，永远不会返回）

要启动我使用的外部进程：

import tools.nsc.io.Process
val res = Process("ls")
res.foreach(println)
res.waitFor // waits until a Process is finished but if it's hanging waitFor will not return or
res.destroy // kills a process

但我没有找到一种方法来检查进程是否仍在运行。或者一个 waitFor(time) ，这样我只等待一段时间。

我相信他们应该是一个简单的解决方案，但我找不到它......

原文

My code has to call some external programs which sometimes hangs. (endless loop, will never return)

To start the external Process i use:

import tools.nsc.io.Process
val res = Process("ls")
res.foreach(println)
res.waitFor // waits until a Process is finished but if it's hanging waitFor will not return or
res.destroy // kills a process

But i didn't find a way to check if the process is still running. Or a waitFor(time) so that i only wait for some time.

I believe their should be a simple solution but i'm not able to find it...

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树深时见影 2024-11-09 09:20:45

据我所知，Process中的方法exitValue定义如下：

def exitValue(): Option[Int] =
    catching(classOf[IllegalThreadStateException]) opt process.exitValue()

因此您可以检查exitValue()是否返回None< /code> 或 Some 值。 None 表示进程仍在运行。它遵循文档Java Process.exitValue()

As far as I can see method exitValue in Process is defined as folows:

def exitValue(): Option[Int] =
    catching(classOf[IllegalThreadStateException]) opt process.exitValue()

So you can check whether exitValue() returns None or Some value. None means that process is still running. It follows from documentation to Java Process.exitValue()

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