Tempfile.create_anonymous

# File tmp/rubies/ruby-3.4.1/lib/tempfile.rb, line 606
        def create_anonymous(basename="", tmpdir=nil, mode: 0, **options, &block)
  tmpfile = nil
  tmpdir = Dir.tmpdir() if tmpdir.nil?
  if defined?(File::TMPFILE) # O_TMPFILE since Linux 3.11
    begin
      tmpfile = File.open(tmpdir, File::RDWR | File::TMPFILE, 0600)
    rescue Errno::EISDIR, Errno::ENOENT, Errno::EOPNOTSUPP
      # kernel or the filesystem does not support O_TMPFILE
      # fallback to create-and-unlink
    end
  end
  if tmpfile.nil?
    mode |= File::SHARE_DELETE | File::BINARY # Windows needs them to unlink the opened file.
    tmpfile = create_with_filename(basename, tmpdir, mode: mode, **options)
    File.unlink(tmpfile.path)
    tmppath = tmpfile.path
  end
  path = File.join(tmpdir, '')
  unless tmppath == path
    # clear path.
    tmpfile.autoclose = false
    tmpfile = File.new(tmpfile.fileno, mode: File::RDWR, path: path)
    PathAttr.set_path(tmpfile, path) if defined?(PathAttr)
  end
  if block
    begin
      yield tmpfile
    ensure
      tmpfile.close
    end
  else
    tmpfile
  end
end