Setting the ruby process name

process_ctrl.rb

class ProcessCtrl
  module LibC
    PR_SET_NAME = 15

    extend FFI::Library
    ffi_lib "c"
    attach_function :prctl, [:int, :pointer, :long, :long, :long], :int
  end

  class << self
    def set_process_name(name)
      # The process name is max 16 characters, so get the first 16, and if it is
      # less pad with spaces to avoid formatting wierdness
      process_name = "%-16.16s" % name

      LibC.prctl(LibC::PR_SET_NAME, process_name, 0, 0, 0)
    end
  end
end