Using uname with FFI - Based on https://gist.github.com/895585

uname.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'ffi'

module Uname
  extend FFI::Library
  
  ffi_lib FFI::CURRENT_PROCESS

  class UTSName < FFI::Struct
    layout :sysname   , [:char, 65],
           :nodename  , [:char, 65],
           :release   , [:char, 65],
           :version   , [:char, 65],
           :machine   , [:char, 65],
           :domainname, [:char, 65] 

    def to_hash
      strings = values.map { |v| v.to_s }
      Hash[members.zip strings]
    end 
  end 

  attach_function :uname, [:pointer], :int

  def self.get
    uts = UTSName.new
    if uname(uts) != 0
      { :sysname => '', :nodename => '', :release    => '',
        :version => '', :machine  => '', :domainname => ''
      }
    else
      uts.to_hash
    end
  end

puts Uname.get.inspect