Change the ruby process name in top

Question

I would like to change the name of the ruby process that gets displayed in the linux/unix top command. I have tried the

$0=\'miname\'

approach

Answer 1

I don't think Ruby has the facility builtin (setproctitle(3)). You should probably try to look at ruby-ffi and create the interface to setproctitle(3).

EDIT: I know you have your answer but I want to show you some code to use ffi:

require "ffi"
#
module LibC
  extend FFI::Library

  attach_function :setproctitle, [:string, :varargs], :void
end

LibC.setproctitle("Ruby: executing %s", :string, $0)

Does not work on OS X because setproctitle(3) does not exist, works on FreeBSD.