如何从Ruby检查具有特定pid的进程是否正在运行? [英] How can I check from Ruby whether a process with a certain pid is running?

问题描述

如果有不只一种方法，请列出它们.我只知道其中一种，但是我想知道是否有一种更干净的Ruby方式.

If there is more than one way, please list them. I only know of one, but I'm wondering if there is a cleaner, in-Ruby way.

推荐答案

如果这是您希望拥有"的进程(例如，您正在使用它来验证您控制的进程的pid)，则只需发送sig 0.

If it's a process you expect to "own" (e.g. you're using this to validate a pid for a process you control), you can just send sig 0 to it.

>> Process.kill 0, 370
=> 1
>> Process.kill 0, 2
Errno::ESRCH: No such process
    from (irb):5:in `kill'
    from (irb):5
>> 

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