# File lib/unix/sys/cpu.rb, line 92
    def self.architecture
      if respond_to?(:sysinfo, true)
        buf = 0.chr * 257

        if sysinfo(SI_ARCHITECTURE, buf, buf.size) < 0
          raise Error, "sysinfo function failed"
        end

        buf.strip
      elsif respond_to?(:sysctlbyname, true)
        optr = FFI::MemoryPointer.new(:char, 256)
        size = FFI::MemoryPointer.new(:size_t)

        size.write_int(optr.size)

        if RbConfig::CONFIG['host_os'] =~ /darwin/i
          name = 'hw.machine'
        else
          name = 'hw.machine_arch'
        end

        if sysctlbyname(name, optr, size, nil, 0) < 0
          raise Error, "sysctlbyname function failed"
        end

        optr.read_string
      else
        buf  = 0.chr * 64
        mib  = FFI::MemoryPointer.new(:int, 2)
        size = FFI::MemoryPointer.new(:long, 1)

        mib.write_array_of_int([CTL_HW, HW_MACHINE_ARCH])
        size.write_int(buf.size)

        if sysctl(mib, 2, buf, size, nil, 0) < 0
          raise Error, "sysctl function failed"
        end

        buf.strip
      end
    end