summaryrefslogtreecommitdiff
path: root/test/rinda/test_rinda.rb
blob: 2bda9cc363afa38502ae8dfc466fef8199dc02d9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
require 'test/unit'

require 'drb/drb'
require 'drb/eq'
require 'rinda/ring'
require 'rinda/tuplespace'

require 'singleton'

module Rinda

class MockClock
  include Singleton

  class MyTS < Rinda::TupleSpace
    def keeper_thread
      nil
    end
  end

  def initialize
    @now = 2
    @reso = 1
    @ts = MyTS.new
    @ts.write([2, :now])
    @inf = 2**31 - 1
  end

  def now
    @now.to_f
  end

  def at(n)
    n
  end

  def _forward(n=nil)
    now ,= @ts.take([nil, :now])
    @now = now + n
    n = @reso if n.nil?
    @ts.write([@now, :now])
  end

  def forward(n)
    while n > 0
      _forward(@reso)
      n -= @reso
      Thread.pass
    end
  end

  def rewind
    @ts.take([nil, :now])
    @ts.write([@inf, :now])
    @ts.take([nil, :now])
    @now = 2
    @ts.write([2, :now])
  end

  def sleep(n=nil)
    now ,= @ts.read([nil, :now])
    @ts.read([(now + n)..@inf, :now])
    0
  end
end

module Time
  def sleep(n)
    @m.sleep(n)
  end
  module_function :sleep

  def at(n)
    n
  end
  module_function :at

  def now
    defined?(@m) && @m ? @m.now : 2
  end
  module_function :now

  def rewind
    @m.rewind
  end
  module_function :rewind

  def forward(n)
    @m.forward(n)
  end
  module_function :forward

  @m = MockClock.instance
end

class TupleSpace
  def sleep(n)
    Kernel.sleep(n * 0.01)
  end
end

module TupleSpaceTestModule
  def sleep(n)
    if Thread.current == Thread.main
      Time.forward(n)
    else
      Time.sleep(n)
    end
  end

  def thread_join(th)
    while th.alive?
      Kernel.sleep(0.1)
      sleep(1)
    end
    th.value
  end

  def test_00_tuple
    tuple = Rinda::TupleEntry.new([1,2,3])
    assert(!tuple.canceled?)
    assert(!tuple.expired?)
    assert(tuple.alive?)
  end

  def test_00_template
    tmpl = Rinda::Template.new([1,2,3])
    assert_equal(3, tmpl.size)
    assert_equal(3, tmpl[2])
    assert(tmpl.match([1,2,3]))
    assert(!tmpl.match([1,nil,3]))

    tmpl = Rinda::Template.new([/^rinda/i, nil, :hello])
    assert_equal(3, tmpl.size)
    assert(tmpl.match(['Rinda', 2, :hello]))
    assert(!tmpl.match(['Rinda', 2, Symbol]))
    assert(!tmpl.match([1, 2, :hello]))
    assert(tmpl.match([/^rinda/i, 2, :hello]))

    tmpl = Rinda::Template.new([Symbol])
    assert_equal(1, tmpl.size)
    assert(tmpl.match([:hello]))
    assert(tmpl.match([Symbol]))
    assert(!tmpl.match(['Symbol']))

    tmpl = Rinda::Template.new({"message"=>String, "name"=>String})
    assert_equal(2, tmpl.size)
    assert(tmpl.match({"message"=>"Hello", "name"=>"Foo"}))
    assert(!tmpl.match({"message"=>"Hello", "name"=>"Foo", "1"=>2}))
    assert(!tmpl.match({"message"=>"Hi", "name"=>"Foo", "age"=>1}))
    assert(!tmpl.match({"message"=>"Hello", "no_name"=>"Foo"}))

    assert_raise(Rinda::InvalidHashTupleKey) do
      Rinda::Template.new({:message=>String, "name"=>String})
    end
    tmpl = Rinda::Template.new({"name"=>String})
    assert_equal(1, tmpl.size)
    assert(tmpl.match({"name"=>"Foo"}))
    assert(!tmpl.match({"message"=>"Hello", "name"=>"Foo"}))
    assert(!tmpl.match({"message"=>:symbol, "name"=>"Foo", "1"=>2}))
    assert(!tmpl.match({"message"=>"Hi", "name"=>"Foo", "age"=>1}))
    assert(!tmpl.match({"message"=>"Hello", "no_name"=>"Foo"}))

    tmpl = Rinda::Template.new({"message"=>String, "name"=>String})
    assert_equal(2, tmpl.size)
    assert(tmpl.match({"message"=>"Hello", "name"=>"Foo"}))
    assert(!tmpl.match({"message"=>"Hello", "name"=>"Foo", "1"=>2}))
    assert(!tmpl.match({"message"=>"Hi", "name"=>"Foo", "age"=>1}))
    assert(!tmpl.match({"message"=>"Hello", "no_name"=>"Foo"}))

    tmpl = Rinda::Template.new({"message"=>String})
    assert_equal(1, tmpl.size)
    assert(tmpl.match({"message"=>"Hello"}))
    assert(!tmpl.match({"message"=>"Hello", "name"=>"Foo"}))
    assert(!tmpl.match({"message"=>"Hello", "name"=>"Foo", "1"=>2}))
    assert(!tmpl.match({"message"=>"Hi", "name"=>"Foo", "age"=>1}))
    assert(!tmpl.match({"message"=>"Hello", "no_name"=>"Foo"}))

    tmpl = Rinda::Template.new({"message"=>String, "name"=>nil})
    assert_equal(2, tmpl.size)
    assert(tmpl.match({"message"=>"Hello", "name"=>"Foo"}))
    assert(!tmpl.match({"message"=>"Hello", "name"=>"Foo", "1"=>2}))
    assert(!tmpl.match({"message"=>"Hi", "name"=>"Foo", "age"=>1}))
    assert(!tmpl.match({"message"=>"Hello", "no_name"=>"Foo"}))

    assert_raise(Rinda::InvalidHashTupleKey) do
      @ts.write({:message=>String, "name"=>String})
    end

    @ts.write([1, 2, 3])
    assert_equal([1, 2, 3], @ts.take([1, 2, 3]))

    @ts.write({'1'=>1, '2'=>2, '3'=>3})
    assert_equal({'1'=>1, '2'=>2, '3'=>3}, @ts.take({'1'=>1, '2'=>2, '3'=>3}))

    entry = @ts.write(['1'=>1, '2'=>2, '3'=>3])
    assert_raise(Rinda::RequestExpiredError) do
      assert_equal({'1'=>1, '2'=>2, '3'=>3}, @ts.read({'1'=>1}, 0))
    end
    entry.cancel
  end

  def test_00_DRbObject
    ro = DRbObject.new(nil, "druby://host:1234")
    tmpl = Rinda::DRbObjectTemplate.new
    assert(tmpl === ro)

    tmpl = Rinda::DRbObjectTemplate.new("druby://host:1234")
    assert(tmpl === ro)

    tmpl = Rinda::DRbObjectTemplate.new("druby://host:12345")
    assert(!(tmpl === ro))

    tmpl = Rinda::DRbObjectTemplate.new(/^druby:\/\/host:/)
    assert(tmpl === ro)

    ro = DRbObject.new_with(12345, 1234)
    assert(!(tmpl === ro))

    ro = DRbObject.new_with("druby://foo:12345", 1234)
    assert(!(tmpl === ro))

    tmpl = Rinda::DRbObjectTemplate.new(/^druby:\/\/(foo|bar):/)
    assert(tmpl === ro)

    ro = DRbObject.new_with("druby://bar:12345", 1234)
    assert(tmpl === ro)

    ro = DRbObject.new_with("druby://baz:12345", 1234)
    assert(!(tmpl === ro))
  end

  def test_inp_rdp
    assert_raise(Rinda::RequestExpiredError) do
      @ts.take([:empty], 0)
    end

    assert_raise(Rinda::RequestExpiredError) do
      @ts.read([:empty], 0)
    end
  end

  def test_ruby_talk_264062
    th = Thread.new { @ts.take([:empty], 1) }
    sleep(10)
    assert_raise(Rinda::RequestExpiredError) do
      thread_join(th)
    end

    th = Thread.new { @ts.read([:empty], 1) }
    sleep(10)
    assert_raise(Rinda::RequestExpiredError) do
      thread_join(th)
    end
  end

  def test_symbol_tuple
    @ts.write([:symbol, :symbol])
    @ts.write(['string', :string])
    assert_equal([[:symbol, :symbol]], @ts.read_all([:symbol, nil]))
    assert_equal([[:symbol, :symbol]], @ts.read_all([Symbol, nil]))
    assert_equal([], @ts.read_all([:nil, nil]))
  end

  def test_core_01
    5.times do
      @ts.write([:req, 2])
    end

    assert_equal([[:req, 2], [:req, 2], [:req, 2], [:req, 2], [:req, 2]],
		 @ts.read_all([nil, nil]))

    taker = Thread.new(5) do |count|
      s = 0
      count.times do
        tuple = @ts.take([:req, Integer])
        assert_equal(2, tuple[1])
        s += tuple[1]
      end
      @ts.write([:ans, s])
      s
    end

    assert_equal(10, thread_join(taker))
    assert_equal([:ans, 10], @ts.take([:ans, 10]))
    assert_equal([], @ts.read_all([nil, nil]))
  end

  def test_core_02
    taker = Thread.new(5) do |count|
      s = 0
      count.times do
        tuple = @ts.take([:req, Integer])
        assert_equal(2, tuple[1])
        s += tuple[1]
      end
      @ts.write([:ans, s])
      s
    end

    5.times do
      @ts.write([:req, 2])
    end

    assert_equal(10, thread_join(taker))
    assert_equal([:ans, 10], @ts.take([:ans, 10]))
    assert_equal([], @ts.read_all([nil, nil]))
  end

  def test_core_03_notify
    notify1 = @ts.notify(nil, [:req, Integer])
    notify2 = @ts.notify(nil, {"message"=>String, "name"=>String})

    5.times do
      @ts.write([:req, 2])
    end

    5.times do
      tuple = @ts.take([:req, Integer])
      assert_equal(2, tuple[1])
    end

    5.times do
      assert_equal(['write', [:req, 2]], notify1.pop)
    end
    5.times do
      assert_equal(['take', [:req, 2]], notify1.pop)
    end

    @ts.write({"message"=>"first", "name"=>"3"})
    @ts.write({"message"=>"second", "name"=>"1"})
    @ts.write({"message"=>"third", "name"=>"0"})
    @ts.take({"message"=>"third", "name"=>"0"})
    @ts.take({"message"=>"first", "name"=>"3"})

    assert_equal(["write", {"message"=>"first", "name"=>"3"}], notify2.pop)
    assert_equal(["write", {"message"=>"second", "name"=>"1"}], notify2.pop)
    assert_equal(["write", {"message"=>"third", "name"=>"0"}], notify2.pop)
    assert_equal(["take", {"message"=>"third", "name"=>"0"}], notify2.pop)
    assert_equal(["take", {"message"=>"first", "name"=>"3"}], notify2.pop)
  end

  def test_cancel_01
    entry = @ts.write([:removeme, 1])
    assert_equal([[:removeme, 1]], @ts.read_all([nil, nil]))
    entry.cancel
    assert_equal([], @ts.read_all([nil, nil]))

    template = nil
    taker = Thread.new do
      @ts.take([:take, nil], 10) do |t|
        template = t
	Thread.new do
	  template.cancel
	end
      end
    end

    sleep(2)

    assert_raise(Rinda::RequestCanceledError) do
      assert_nil(thread_join(taker))
    end

    assert(template.canceled?)

    @ts.write([:take, 1])

    assert_equal([[:take, 1]], @ts.read_all([nil, nil]))
  end

  def test_cancel_02
    entry = @ts.write([:removeme, 1])
    assert_equal([[:removeme, 1]], @ts.read_all([nil, nil]))
    entry.cancel
    assert_equal([], @ts.read_all([nil, nil]))

    template = nil
    reader = Thread.new do
      @ts.read([:take, nil], 10) do |t|
        template = t
	Thread.new do
	  template.cancel
	end
      end
    end

    sleep(2)

    assert_raise(Rinda::RequestCanceledError) do
      assert_nil(thread_join(reader))
    end

    assert(template.canceled?)

    @ts.write([:take, 1])

    assert_equal([[:take, 1]], @ts.read_all([nil, nil]))
  end

  class SimpleRenewer
    def initialize(sec, n = 1)
      @sec = sec
      @n = n
    end

    def renew
      return -1 if @n <= 0
      @n -= 1
      return @sec
    end
  end

  def test_00_renewer
    tuple = Rinda::TupleEntry.new([1,2,3], true)
    assert(!tuple.canceled?)
    assert(tuple.expired?)
    assert(!tuple.alive?)

    tuple = Rinda::TupleEntry.new([1,2,3], 1)
    assert(!tuple.canceled?)
    assert(!tuple.expired?)
    assert(tuple.alive?)
    sleep(2)
    assert(tuple.expired?)
    assert(!tuple.alive?)

    @renewer = SimpleRenewer.new(1,2)
    tuple = Rinda::TupleEntry.new([1,2,3], @renewer)
    assert(!tuple.canceled?)
    assert(!tuple.expired?)
    assert(tuple.alive?)
    sleep(1)
    assert(!tuple.canceled?)
    assert(!tuple.expired?)
    assert(tuple.alive?)
    sleep(2)
    assert(tuple.expired?)
    assert(!tuple.alive?)
  end
end

class TupleSpaceTest < Test::Unit::TestCase
  include TupleSpaceTestModule

  def setup
    ThreadGroup.new.add(Thread.current)
    @ts = Rinda::TupleSpace.new(1)
  end
  def teardown
    # implementation-dependent
    @ts.instance_eval{@keeper.kill if @keeper}
  end
end

class TupleSpaceProxyTest < Test::Unit::TestCase
  include TupleSpaceTestModule

  def setup
    ThreadGroup.new.add(Thread.current)
    @ts_base = Rinda::TupleSpace.new(1)
    @ts = Rinda::TupleSpaceProxy.new(@ts_base)
  end
  def teardown
    # implementation-dependent
    @ts_base.instance_eval{@keeper.kill if @keeper}
  end

  def test_remote_array_and_hash
    # Don't remove ary/hsh local variables.
    # These are necessary to protect objects from GC.
    ary = [1, 2, 3]
    @ts.write(DRbObject.new(ary))
    assert_equal([1, 2, 3], @ts.take([1, 2, 3], 0))
    hsh = {'head' => 1, 'tail' => 2}
    @ts.write(DRbObject.new(hsh))
    assert_equal({'head' => 1, 'tail' => 2},
                 @ts.take({'head' => 1, 'tail' => 2}, 0))
  end

  def test_take_bug_8215
    require_relative '../ruby/envutil'
    service = DRb.start_service(nil, @ts_base)

    uri = service.uri

    args = [EnvUtil.rubybin, *%W[-rdrb/drb -rdrb/eq -rrinda/ring -rrinda/tuplespace -e]]

    take = spawn(*args, <<-'end;', uri)
      uri = ARGV[0]
      DRb.start_service
      ro = DRbObject.new_with_uri(uri)
      ts = Rinda::TupleSpaceProxy.new(ro)
      th = Thread.new do
        ts.take([:test_take, nil])
      end
      Kernel.sleep(0.1)
      th.raise(Interrupt) # causes loss of the taken tuple
      ts.write([:barrier, :continue])
      Kernel.sleep
    end;

    @ts_base.take([:barrier, :continue])

    write = spawn(*args, <<-'end;', uri)
      uri = ARGV[0]
      DRb.start_service
      ro = DRbObject.new_with_uri(uri)
      ts = Rinda::TupleSpaceProxy.new(ro)
      ts.write([:test_take, 42])
    end;

    status = Process.wait(write)

    assert_equal([[:test_take, 42]], @ts_base.read_all([:test_take, nil]),
                 '[bug:8215] tuple lost')
  ensure
    signal = /mswin|mingw/ =~ RUBY_PLATFORM ? "KILL" : "TERM"
    Process.kill(signal, write) if write && status.nil?
    Process.kill(signal, take)  if take
    Process.wait(write) if write && status.nil?
    Process.wait(take)  if take
  end

  @server = DRb.primary_server || DRb.start_service
end

module RingIPv6
  def prepare_ipv6(r)
    begin
      Socket.getifaddrs.each do |ifaddr|
        next unless ifaddr.addr
        next unless ifaddr.addr.ipv6_linklocal?
        next if ifaddr.name[0, 2] == "lo"
        r.multicast_interface = ifaddr.ifindex
        return ifaddr
      end
    rescue NotImplementedError
      # ifindex() function may not be implemented on Windows.
      return if
        Socket.ip_address_list.any? { |addrinfo| addrinfo.ipv6? }
    end
    skip 'IPv6 not available'
  end
end

class TestRingServer < Test::Unit::TestCase

  def setup
    @port = Rinda::Ring_PORT

    @ts = Rinda::TupleSpace.new
    @rs = Rinda::RingServer.new(@ts, [], @port)
  end
  def teardown
    # implementation-dependent
    @ts.instance_eval{@keeper.kill if @keeper}
    @rs.shutdown
  end

  def test_make_socket_unicast
    v4 = @rs.make_socket('127.0.0.1')

    assert_equal('127.0.0.1', v4.local_address.ip_address)
    assert_equal(@port,       v4.local_address.ip_port)
  end

  def test_make_socket_ipv4_multicast
    v4mc = @rs.make_socket('239.0.0.1')

    if Socket.const_defined?(:SO_REUSEPORT) then
      assert(v4mc.getsockopt(:SOCKET, :SO_REUSEPORT).bool)
    else
      assert(v4mc.getsockopt(:SOCKET, :SO_REUSEADDR).bool)
    end

    assert_equal('0.0.0.0', v4mc.local_address.ip_address)
    assert_equal(@port,     v4mc.local_address.ip_port)
  end

  def test_make_socket_ipv6_multicast
    skip 'IPv6 not available' unless
      Socket.ip_address_list.any? { |addrinfo| addrinfo.ipv6? }

    begin
      v6mc = @rs.make_socket('ff02::1')
    rescue Errno::EADDRNOTAVAIL
      return # IPv6 address for multicast not available
    end

    if Socket.const_defined?(:SO_REUSEPORT) then
      assert v6mc.getsockopt(:SOCKET, :SO_REUSEPORT).bool
    else
      assert v6mc.getsockopt(:SOCKET, :SO_REUSEADDR).bool
    end

    assert_equal('::1', v6mc.local_address.ip_address)
    assert_equal(@port, v6mc.local_address.ip_port)
  end

  def test_ring_server_ipv4_multicast
    @rs = Rinda::RingServer.new(@ts, [['239.0.0.1', '0.0.0.0']], @port)
    v4mc = @rs.instance_variable_get('@sockets').first

    if Socket.const_defined?(:SO_REUSEPORT) then
      assert(v4mc.getsockopt(:SOCKET, :SO_REUSEPORT).bool)
    else
      assert(v4mc.getsockopt(:SOCKET, :SO_REUSEADDR).bool)
    end

    assert_equal('0.0.0.0', v4mc.local_address.ip_address)
    assert_equal(@port,     v4mc.local_address.ip_port)
  end

  def test_ring_server_ipv6_multicast
    skip 'IPv6 not available' unless
      Socket.ip_address_list.any? { |addrinfo| addrinfo.ipv6? }

    begin
      @rs = Rinda::RingServer.new(@ts, [['ff02::1', '::1', 0]], @port)
    rescue Errno::EADDRNOTAVAIL
      return # IPv6 address for multicast not available
    end

    v6mc = @rs.instance_variable_get('@sockets').first

    if Socket.const_defined?(:SO_REUSEPORT) then
      assert v6mc.getsockopt(:SOCKET, :SO_REUSEPORT).bool
    else
      assert v6mc.getsockopt(:SOCKET, :SO_REUSEADDR).bool
    end

    assert_equal('::1', v6mc.local_address.ip_address)
    assert_equal(@port, v6mc.local_address.ip_port)
  end

  def test_shutdown
    @rs.shutdown

    assert_nil(@rs.do_reply, 'otherwise should hang forever')
  end

end

class TestRingFinger < Test::Unit::TestCase
  include RingIPv6

  def setup
    @rf = Rinda::RingFinger.new
  end

  def test_make_socket_unicast
    v4 = @rf.make_socket('127.0.0.1')

    assert(v4.getsockopt(:SOL_SOCKET, :SO_BROADCAST).bool)
  end

  def test_make_socket_ipv4_multicast
    v4mc = @rf.make_socket('239.0.0.1')

    assert_equal(1, v4mc.getsockopt(:IPPROTO_IP, :IP_MULTICAST_LOOP).ipv4_multicast_loop)
    assert_equal(1, v4mc.getsockopt(:IPPROTO_IP, :IP_MULTICAST_TTL).ipv4_multicast_ttl)
  end

  def test_make_socket_ipv6_multicast
    ifaddr = prepare_ipv6(@rf)
    begin
      v6mc = @rf.make_socket("ff02::1")
    rescue Errno::EINVAL
      # somehow Debian 6.0.7 needs ifname
      v6mc = @rf.make_socket("ff02::1%#{ifaddr.name}")
    end

    assert_equal(1, v6mc.getsockopt(:IPPROTO_IPV6, :IPV6_MULTICAST_LOOP).int)
    assert_equal(1, v6mc.getsockopt(:IPPROTO_IPV6, :IPV6_MULTICAST_HOPS).int)
  end

  def test_make_socket_ipv4_multicast_hops
    @rf.multicast_hops = 2
    v4mc = @rf.make_socket('239.0.0.1')
    assert_equal(2, v4mc.getsockopt(:IPPROTO_IP, :IP_MULTICAST_TTL).ipv4_multicast_ttl)
  end

  def test_make_socket_ipv6_multicast_hops
    ifaddr = prepare_ipv6(@rf)
    @rf.multicast_hops = 2
    begin
      v6mc = @rf.make_socket("ff02::1")
    rescue Errno::EINVAL
      # somehow Debian 6.0.7 needs ifname
      v6mc = @rf.make_socket("ff02::1%#{ifaddr.name}")
    end
    assert_equal(2, v6mc.getsockopt(:IPPROTO_IPV6, :IPV6_MULTICAST_HOPS).int)
  end

end

end