File: ppid_spec.rb

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require File.expand_path('../../../spec_helper', __FILE__)

describe "Process.ppid" do
  with_feature :fork do
    it "returns the process id of the parent of this process" do

      read, write = IO.pipe

      child_pid = Process.fork {
        read.close
        write << "#{Process.ppid}\n"
        write.close
        exit!
      }

      write.close
      pid = read.gets
      read.close
      Process.wait(child_pid)
      pid.to_i.should == Process.pid
    end
  end
end