如何使用 Ruby 检查正在运行的进程？

发布于 2024-10-10 17:44:14 字数 354 浏览 4 评论 0原文

我使用调度程序（Rufus 调度程序）每分钟启动一个名为“ar_sendmail”的进程（来自 ARmailer）。

当已经有这样的进程正在运行时，不应启动该进程，以免耗尽内存。

如何检查该进程是否已在运行？下面的unless后面接什么？

scheduler = Rufus::Scheduler.start_new

  scheduler.every '1m' do

    unless #[what goes here?]
      fork { exec "ar_sendmail -o" }
      Process.wait
    end

  end

end

原文

I use a scheduler (Rufus scheduler) to launch a process called "ar_sendmail" (from ARmailer), every minute.

The process should NOT be launched when there is already such a process running in order not to eat up memory.

How do I check to see if this process is already running? What goes after the unless below?

scheduler = Rufus::Scheduler.start_new

  scheduler.every '1m' do

    unless #[what goes here?]
      fork { exec "ar_sendmail -o" }
      Process.wait
    end

  end

end

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强者自强 2024-10-17 17:44:14

unless `ps aux | grep ar_sendmai[l]` != ""

unless `ps aux | grep ar_sendmai[l]` != ""

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萌吟 2024-10-17 17:44:14

unless `pgrep -f ar_sendmail`.split("\n") != [Process.pid.to_s]

unless `pgrep -f ar_sendmail`.split("\n") != [Process.pid.to_s]

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别挽留 2024-10-17 17:44:14

我认为这看起来更简洁，并且使用内置的 Ruby 模块。发送 0 杀死信号（即不杀死）：

  # Check if a process is running
  def running?(pid)
    Process.kill(0, pid)
    true
  rescue Errno::ESRCH
    false
  rescue Errno::EPERM
    true
  end

稍作修改自快速开发提示您可能不想拯救 EPERM，意思是“它正在运行，但不允许您杀死它”。

This looks neater I think, and uses built-in Ruby module. Send a 0 kill signal (i.e. don't kill):

  # Check if a process is running
  def running?(pid)
    Process.kill(0, pid)
    true
  rescue Errno::ESRCH
    false
  rescue Errno::EPERM
    true
  end

Slightly amended from Quick dev tips You might not want to rescue EPERM, meaning "it's running, but you're not allowed to kill it".

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