--- Process.waitall ruby 1.7 feature

    ƤλҥץλΤԤޤ

    λҥץ pid Ƚλơ(Process::Status)
    Ǥ˻֤ޤҥץʤ֤ǤΥ᥽
    ɤƤӽФȶ֤ޤ

    $? ˤϺǸ˽λҥץνλơ
    ꤵޤ

    :
        3.times {|n|
          Process.fork() { exit n }
        }
        p ret = Process.waitall
        p ret[-1][1]  , ret[-1][1].type 
        p $?          , $?.type
        => [[5245, 256], [5244, 0], [5243, 512]]
           512
           Process::Status
           512
           Process::Status

