uname() - ruby ffi

uname.rb

require 'ffi'

module Uname
  extend FFI::Library
  
  ffi_lib FFI::CURRENT_PROCESS
  
  class UtsName < FFI::Struct
    layout :sysname , [:char, 256],
           :nodename, [:char, 256],
           :release , [:char, 256],
           :version , [:char, 256],
           :machine , [:char, 256]
           
    def to_hash
      strings = values.map { |v| v.to_s }
      Hash[members.zip strings]
    end
  end
  
  attach_function :uname, [:pointer], :int
  
  def self.get
    un = UtsName.new
    if uname(un) != 0 
      raise "failed" # check errno
    end
    
    un.to_hash
  end
end

if __FILE__ == $0
  p Uname.get  
end