From: Ollivier Robert <keltia@...>
Date: 2009-01-17T02:00:42+09:00
Subject: [FFI] how to bind to a function with variable number of args

I'm looking at ruby-ffi 0.2.0 with MRI 1.8.7 (haven't tried with
rubinius yet) and I can get to attach to setproctitle(3) defined like
this:

     void
     setproctitle(const char *fmt, ...);

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

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

LibC.setproctitle("Ruby: executing %s", $0)
----
gives
-----
FFI::NotFoundError: Function 'setproctitle' not found in [[current
process]]
  from
/opt/local/lib/ruby/gems/1.8/gems/ffi-0.2.0/lib/ffi/library.rb:65:in
`attach_function'
-----
Any idea?
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