# Copyright (c) 2020 Contrast Security, Inc. See https://www.contrastsecurity.com/enduser-terms-0317a for more details.
# frozen_string_literal: true

module Contrast
  module Utils
    # Simple utility used to make OS calls and determine state. For that state
    # which will not change at runtime, such as the operating system, the
    # Utility memozies to avoid multiple lookups.
    module OS
      class << self
        def running?
          process = `ps aux | grep contrast-servic[e]`
          process != ''
        end

        # check if service was killed and is a zombie process
        # returns an array of zombie process PIDs as strings; empty array if there are none
        def zombie_pids
          zombie_pid_list = `ps aux | grep contrast-servic[e] | grep Z | awk '{print $2}'` # retrieve pid of service processes
          zombie_pid_list.split("\n")
        end
      end
    end
  end
end