zhangyuan/gist:6546730

Created September 13, 2013 04:16

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判断进程是否在运行

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gistfile1.md

module Process
  # Returns +true+ the process identied by +pid+ is running.
  def running?(pid)
    Process.getpgid(pid) != -1
  rescue Errno::EPERM
    true
  rescue Errno::ESRCH
    false
  end
  module_function :running?
end

参考自 Thin 的源码 https://github.com/macournoyer/thin/blob/v1.5.1/lib/thin/daemonizing.rb#L4

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