summary refs log tree commit diff
path: root/rt/tst-mqueue5.c
blob: 76e83a13b6a5233058ab782750c744a82ca71437 (plain) (blame)
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
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
/* Test mq_notify.
   Copyright (C) 2004-2019 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Jakub Jelinek <jakub@redhat.com>, 2004.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#include <errno.h>
#include <fcntl.h>
#include <mqueue.h>
#include <limits.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>
#include "tst-mqueue.h"

#if _POSIX_THREADS && defined SIGRTMIN && defined SA_SIGINFO
# include <pthread.h>

volatile int rtmin_cnt;
volatile pid_t rtmin_pid;
volatile uid_t rtmin_uid;
volatile int rtmin_code;
volatile union sigval rtmin_sigval;

static void
rtmin_handler (int sig, siginfo_t *info, void *ctx)
{
  if (sig != SIGRTMIN)
    abort ();
  ++rtmin_cnt;
  rtmin_pid = info->si_pid;
  rtmin_uid = info->si_uid;
  rtmin_code = info->si_code;
  rtmin_sigval = info->si_value;
}

#define mqsend(q) (mqsend) (q, __LINE__)
static int
(mqsend) (mqd_t q, int line)
{
  char c;
  if (mq_send (q, &c, 1, 1) != 0)
    {
      printf ("mq_send on line %d failed with: %m\n", line);
      return 1;
    }
  return 0;
}

#define mqrecv(q) (mqrecv) (q, __LINE__)
static int
(mqrecv) (mqd_t q, int line)
{
  char c;
  ssize_t rets = TEMP_FAILURE_RETRY (mq_receive (q, &c, 1, NULL));
  if (rets != 1)
    {
      if (rets == -1)
	printf ("mq_receive on line %d failed with: %m\n", line);
      else
	printf ("mq_receive on line %d returned %zd != 1\n",
		line, rets);
      return 1;
    }
  return 0;
}

struct thr_data
{
  const char *name;
  pthread_barrier_t *b3;
  mqd_t q;
};

static void *
thr (void *arg)
{
  pthread_barrier_t *b3 = ((struct thr_data *)arg)->b3;
  mqd_t q = ((struct thr_data *)arg)->q;
  const char *name = ((struct thr_data *)arg)->name;
  int result = 0;

  result |= mqrecv (q);

  (void) pthread_barrier_wait (b3);

  /* Child verifies SIGRTMIN has not been sent.  */

  (void) pthread_barrier_wait (b3);

  /* Parent calls mqsend (q), which should trigger notification.  */

  (void) pthread_barrier_wait (b3);

  if (rtmin_cnt != 2)
    {
      puts ("SIGRTMIN signal in thread did not arrive");
      result = 1;
    }
  else if (rtmin_pid != getppid ()
	   || rtmin_uid != getuid ()
	   || rtmin_code != SI_MESGQ
	   || rtmin_sigval.sival_int != 0xdeadbeef)
    {
      printf ("unexpected siginfo_t fields: pid %u (%u), uid %u (%u), code %d (%d), si_int %d (%d)\n",
	      rtmin_pid, getppid (), rtmin_uid, getuid (),
	      rtmin_code, SI_MESGQ, rtmin_sigval.sival_int, 0xdeadbeef);
      result = 1;
    }

  struct sigevent ev;
  memset (&ev, 0x82, sizeof (ev));
  ev.sigev_notify = SIGEV_NONE;
  if (mq_notify (q, &ev) != 0)
    {
      printf ("mq_notify in thread (q, { SIGEV_NONE }) failed with: %m\n");
      result = 1;
    }

  if (mq_notify (q, NULL) != 0)
    {
      printf ("mq_notify in thread (q, NULL) failed with: %m\n");
      result = 1;
    }

  result |= mqrecv (q);

  (void) pthread_barrier_wait (b3);

  /* Child calls mq_notify (q, { SIGEV_SIGNAL }).  */

  (void) pthread_barrier_wait (b3);

  if (mq_notify (q, NULL) != 0)
    {
      printf ("second mq_notify in thread (q, NULL) failed with: %m\n");
      result = 1;
    }

  (void) pthread_barrier_wait (b3);

  /* Parent calls mqsend (q), which should not trigger notification.  */

  (void) pthread_barrier_wait (b3);

  /* Child verifies SIGRTMIN has not been received.  */
  /* Child calls mq_notify (q, { SIGEV_SIGNAL }).  */

  (void) pthread_barrier_wait (b3);

  mqd_t q4 = mq_open (name, O_RDONLY);
  if (q4 == (mqd_t) -1)
    {
      printf ("mq_open in thread failed with: %m\n");
      result = 1;
    }

  if (mq_notify (q4, NULL) != 0)
    {
      printf ("mq_notify in thread (q4, NULL) failed with: %m\n");
      result = 1;
    }

  if (mq_close (q4) != 0)
    {
      printf ("mq_close in thread failed with: %m\n");
      result = 1;
    }

  (void) pthread_barrier_wait (b3);

  /* Parent calls mqsend (q), which should not trigger notification.  */

  (void) pthread_barrier_wait (b3);

  /* Child verifies SIGRTMIN has not been received.  */
  /* Child calls mq_notify (q, { SIGEV_SIGNAL }).  */

  (void) pthread_barrier_wait (b3);

  mqd_t q5 = mq_open (name, O_WRONLY);
  if (q5 == (mqd_t) -1)
    {
      printf ("mq_open O_WRONLY in thread failed with: %m\n");
      result = 1;
    }

  if (mq_notify (q5, NULL) != 0)
    {
      printf ("mq_notify in thread (q5, NULL) failed with: %m\n");
      result = 1;
    }

  if (mq_close (q5) != 0)
    {
      printf ("mq_close in thread failed with: %m\n");
      result = 1;
    }

  (void) pthread_barrier_wait (b3);

  /* Parent calls mqsend (q), which should not trigger notification.  */

  (void) pthread_barrier_wait (b3);

  /* Child verifies SIGRTMIN has not been received.  */

  return (void *) (long) result;
}

static void
do_child (const char *name, pthread_barrier_t *b2, pthread_barrier_t *b3,
	  mqd_t q)
{
  int result = 0;

  struct sigevent ev;
  memset (&ev, 0x55, sizeof (ev));
  ev.sigev_notify = SIGEV_SIGNAL;
  ev.sigev_signo = SIGRTMIN;
  ev.sigev_value.sival_ptr = &ev;
  if (mq_notify (q, &ev) == 0)
    {
      puts ("first mq_notify in child (q, { SIGEV_SIGNAL }) unexpectedly succeeded");
      result = 1;
    }
  else if (errno != EBUSY)
    {
      printf ("first mq_notify in child (q, { SIGEV_SIGNAL }) failed with: %m\n");
      result = 1;
    }

  (void) pthread_barrier_wait (b2);

  /* Parent calls mqsend (q), which makes notification available.  */

  (void) pthread_barrier_wait (b2);

  rtmin_cnt = 0;

  if (mq_notify (q, &ev) != 0)
    {
      printf ("second mq_notify in child (q, { SIGEV_SIGNAL }) failed with: %m\n");
      result = 1;
    }

  if (rtmin_cnt != 0)
    {
      puts ("SIGRTMIN signal in child caught too early");
      result = 1;
    }

  (void) pthread_barrier_wait (b2);

  /* Parent unsuccessfully attempts to mq_notify.  */
  /* Parent calls mqsend (q), which makes notification available
     and triggers a signal in the child.  */
  /* Parent successfully calls mq_notify SIGEV_SIGNAL.  */

  (void) pthread_barrier_wait (b2);

  if (rtmin_cnt != 1)
    {
      puts ("SIGRTMIN signal in child did not arrive");
      result = 1;
    }
  else if (rtmin_pid != getppid ()
	   || rtmin_uid != getuid ()
	   || rtmin_code != SI_MESGQ
	   || rtmin_sigval.sival_ptr != &ev)
    {
      printf ("unexpected siginfo_t fields: pid %u (%u), uid %u (%u), code %d (%d), si_ptr %p (%p)\n",
	      rtmin_pid, getppid (), rtmin_uid, getuid (),
	      rtmin_code, SI_MESGQ, rtmin_sigval.sival_ptr, &ev);
      result = 1;
    }

  result |= mqsend (q);

  (void) pthread_barrier_wait (b2);

  /* Parent verifies caught SIGRTMIN.  */

  mqd_t q2 = mq_open (name, O_RDWR);
  if (q2 == (mqd_t) -1)
    {
      printf ("mq_open in child failed with: %m\n");
      result = 1;
    }

  (void) pthread_barrier_wait (b2);

  /* Parent mq_open's another mqd_t for the same queue (q3).  */

  memset (&ev, 0x11, sizeof (ev));
  ev.sigev_notify = SIGEV_SIGNAL;
  ev.sigev_signo = SIGRTMIN;
  ev.sigev_value.sival_ptr = &ev;
  if (mq_notify (q2, &ev) != 0)
    {
      printf ("mq_notify in child (q2, { SIGEV_SIGNAL }) failed with: %m\n");
      result = 1;
    }

  (void) pthread_barrier_wait (b2);

  /* Parent unsuccessfully attempts to mq_notify { SIGEV_NONE } on q.  */

  (void) pthread_barrier_wait (b2);

  if (mq_close (q2) != 0)
    {
      printf ("mq_close failed: %m\n");
      result = 1;
    }

  (void) pthread_barrier_wait (b2);

  /* Parent successfully calls mq_notify { SIGEV_NONE } on q3.  */

  (void) pthread_barrier_wait (b2);

  memset (&ev, 0xbb, sizeof (ev));
  ev.sigev_notify = SIGEV_SIGNAL;
  ev.sigev_signo = SIGRTMIN;
  ev.sigev_value.sival_ptr = &b2;
  if (mq_notify (q, &ev) == 0)
    {
      puts ("third mq_notify in child (q, { SIGEV_SIGNAL }) unexpectedly succeeded");
      result = 1;
    }
  else if (errno != EBUSY)
    {
      printf ("third mq_notify in child (q, { SIGEV_SIGNAL }) failed with: %m\n");
      result = 1;
    }

  (void) pthread_barrier_wait (b2);

  /* Parent calls mq_close on q3, which makes the queue available again for
     notification.  */

  (void) pthread_barrier_wait (b2);

  memset (&ev, 0x13, sizeof (ev));
  ev.sigev_notify = SIGEV_NONE;
  if (mq_notify (q, &ev) != 0)
    {
      printf ("mq_notify in child (q, { SIGEV_NONE }) failed with: %m\n");
      result = 1;
    }

  if (mq_notify (q, NULL) != 0)
    {
      printf ("mq_notify in child (q, NULL) failed with: %m\n");
      result = 1;
    }

  (void) pthread_barrier_wait (b2);

  struct thr_data thr_data = { .name = name, .b3 = b3, .q = q };
  pthread_t th;
  int ret = pthread_create (&th, NULL, thr, &thr_data);
  if (ret)
    {
      errno = ret;
      printf ("pthread_created failed with: %m\n");
      result = 1;
    }

  /* Wait till thr calls mq_receive on the empty queue q and blocks on it.  */
  sleep (1);

  memset (&ev, 0x5f, sizeof (ev));
  ev.sigev_notify = SIGEV_SIGNAL;
  ev.sigev_signo = SIGRTMIN;
  ev.sigev_value.sival_int = 0xdeadbeef;
  if (mq_notify (q, &ev) != 0)
    {
      printf ("fourth mq_notify in child (q, { SIGEV_SIGNAL }) failed with: %m\n");
      result = 1;
    }

  /* Ensure the thr thread gets the signal, not us.  */
  sigset_t set;
  sigemptyset (&set);
  sigaddset (&set, SIGRTMIN);
  if (pthread_sigmask (SIG_BLOCK, &set, NULL))
    {
      printf ("Failed to block SIGRTMIN in child: %m\n");
      result = 1;
    }

  (void) pthread_barrier_wait (b2);

  /* Parent calls mqsend (q), which should wake up mqrecv (q)
     in the thread but no notification should be sent.  */

  (void) pthread_barrier_wait (b3);

  if (rtmin_cnt != 1)
    {
      puts ("SIGRTMIN signal caught while thr was blocked on mq_receive");
      result = 1;
    }

  (void) pthread_barrier_wait (b3);

  /* Parent calls mqsend (q), which should trigger notification.  */

  (void) pthread_barrier_wait (b3);

  /* Thread verifies SIGRTMIN has been received.  */
  /* Thread calls mq_notify (q, { SIGEV_NONE }) to verify notification is now
     available for registration.  */
  /* Thread calls mq_notify (q, NULL).  */

  (void) pthread_barrier_wait (b3);

  memset (&ev, 0x6a, sizeof (ev));
  ev.sigev_notify = SIGEV_SIGNAL;
  ev.sigev_signo = SIGRTMIN;
  ev.sigev_value.sival_ptr = do_child;
  if (mq_notify (q, &ev) != 0)
    {
      printf ("fifth mq_notify in child (q, { SIGEV_SIGNAL }) failed with: %m\n");
      result = 1;
    }

  (void) pthread_barrier_wait (b3);

  /* Thread calls mq_notify (q, NULL), which should unregister the above
     notification.  */

  (void) pthread_barrier_wait (b3);

  /* Parent calls mqsend (q), which should not trigger notification.  */

  (void) pthread_barrier_wait (b3);

  if (rtmin_cnt != 2)
    {
      puts ("SIGRTMIN signal caught while notification has been disabled");
      result = 1;
    }

  memset (&ev, 0x7b, sizeof (ev));
  ev.sigev_notify = SIGEV_SIGNAL;
  ev.sigev_signo = SIGRTMIN;
  ev.sigev_value.sival_ptr = thr;
  if (mq_notify (q, &ev) != 0)
    {
      printf ("sixth mq_notify in child (q, { SIGEV_SIGNAL }) failed with: %m\n");
      result = 1;
    }

  (void) pthread_barrier_wait (b3);

  /* Thread opens a new O_RDONLY mqd_t (q4).  */
  /* Thread calls mq_notify (q4, NULL), which should unregister the above
     notification.  */
  /* Thread calls mq_close (q4).  */

  (void) pthread_barrier_wait (b3);

  /* Parent calls mqsend (q), which should not trigger notification.  */

  (void) pthread_barrier_wait (b3);

  if (rtmin_cnt != 2)
    {
      puts ("SIGRTMIN signal caught while notification has been disabled");
      result = 1;
    }

  memset (&ev, 0xe1, sizeof (ev));
  ev.sigev_notify = SIGEV_SIGNAL;
  ev.sigev_signo = SIGRTMIN;
  ev.sigev_value.sival_int = 127;
  if (mq_notify (q, &ev) != 0)
    {
      printf ("seventh mq_notify in child (q, { SIGEV_SIGNAL }) failed with: %m\n");
      result = 1;
    }

  (void) pthread_barrier_wait (b3);

  /* Thread opens a new O_WRONLY mqd_t (q5).  */
  /* Thread calls mq_notify (q5, NULL), which should unregister the above
     notification.  */
  /* Thread calls mq_close (q5).  */

  (void) pthread_barrier_wait (b3);

  /* Parent calls mqsend (q), which should not trigger notification.  */

  (void) pthread_barrier_wait (b3);

  if (rtmin_cnt != 2)
    {
      puts ("SIGRTMIN signal caught while notification has been disabled");
      result = 1;
    }

  /* Reenable test signals before cleaning up the thread.  */
  if (pthread_sigmask (SIG_UNBLOCK, &set, NULL))
    {
      printf ("Failed to unblock SIGRTMIN in child: %m\n");
      result = 1;
    }

  void *thr_ret;
  ret = pthread_join (th, &thr_ret);
  if (ret)
    {
      errno = ret;
      printf ("pthread_join failed: %m\n");
      result = 1;
    }
  else if (thr_ret)
    result = 1;

  if (mq_close (q) != 0)
    {
      printf ("mq_close failed: %m\n");
      result = 1;
    }

  exit (result);
}

#define TEST_FUNCTION do_test ()
static int
do_test (void)
{
  int result = 0;

  char tmpfname[] = "/tmp/tst-mqueue5-barrier.XXXXXX";
  int fd = mkstemp (tmpfname);
  if (fd == -1)
    {
      printf ("cannot open temporary file: %m\n");
      return 1;
    }

  /* Make sure it is always removed.  */
  unlink (tmpfname);

  /* Create one page of data.  */
  size_t ps = sysconf (_SC_PAGESIZE);
  char data[ps];
  memset (data, '\0', ps);

  /* Write the data to the file.  */
  if (write (fd, data, ps) != (ssize_t) ps)
    {
      puts ("short write");
      return 1;
    }

  void *mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
  if (mem == MAP_FAILED)
    {
      printf ("mmap failed: %m\n");
      return 1;
    }

  pthread_barrier_t *b2;
  b2 = (pthread_barrier_t *) (((uintptr_t) mem + __alignof (pthread_barrier_t))
			      & ~(__alignof (pthread_barrier_t) - 1));

  pthread_barrier_t *b3;
  b3 = b2 + 1;

  pthread_barrierattr_t a;
  if (pthread_barrierattr_init (&a) != 0)
    {
      puts ("barrierattr_init failed");
      return 1;
    }

  if (pthread_barrierattr_setpshared (&a, PTHREAD_PROCESS_SHARED) != 0)
    {
      puts ("barrierattr_setpshared failed, could not test");
      return 0;
    }

  if (pthread_barrier_init (b2, &a, 2) != 0)
    {
      puts ("barrier_init failed");
      return 1;
    }

  if (pthread_barrier_init (b3, &a, 3) != 0)
    {
      puts ("barrier_init failed");
      return 1;
    }

  if (pthread_barrierattr_destroy (&a) != 0)
    {
      puts ("barrierattr_destroy failed");
      return 1;
    }

  char name[sizeof "/tst-mqueue5-" + sizeof (pid_t) * 3];
  snprintf (name, sizeof (name), "/tst-mqueue5-%u", getpid ());

  struct mq_attr attr = { .mq_maxmsg = 1, .mq_msgsize = 1 };
  mqd_t q = mq_open (name, O_CREAT | O_EXCL | O_RDWR, 0600, &attr);

  if (q == (mqd_t) -1)
    {
      printf ("mq_open failed with: %m\n");
      return result;
    }
  else
    add_temp_mq (name);

  struct sigevent ev;
  memset (&ev, 0xaa, sizeof (ev));
  ev.sigev_notify = SIGEV_NONE;
  if (mq_notify (q, &ev) != 0)
    {
      printf ("mq_notify (q, { SIGEV_NONE }) failed with: %m\n");
      result = 1;
    }

  if (mq_notify (q, &ev) == 0)
    {
      puts ("second mq_notify (q, { SIGEV_NONE }) unexpectedly succeeded");
      result = 1;
    }
  else if (errno != EBUSY)
    {
      printf ("second mq_notify (q, { SIGEV_NONE }) failed with: %m\n");
      result = 1;
    }

  result |= mqsend (q);

  if (mq_notify (q, &ev) != 0)
    {
      printf ("third mq_notify (q, { SIGEV_NONE }) failed with: %m\n");
      result = 1;
    }

  result |= mqrecv (q);

  if (mq_notify (q, NULL) != 0)
    {
      printf ("mq_notify (q, NULL) failed with: %m\n");
      result = 1;
    }

  if (mq_notify (q, NULL) != 0)
    {
      /* Implementation-defined behaviour, so don't fail,
	 just inform.  */
      printf ("second mq_notify (q, NULL) failed with: %m\n");
    }

  struct sigaction sa = { .sa_sigaction = rtmin_handler,
			  .sa_flags = SA_SIGINFO };
  sigemptyset (&sa.sa_mask);
  sigaction (SIGRTMIN, &sa, NULL);

  memset (&ev, 0x55, sizeof (ev));
  ev.sigev_notify = SIGEV_SIGNAL;
  ev.sigev_signo = SIGRTMIN;
  ev.sigev_value.sival_int = 26;
  if (mq_notify (q, &ev) != 0)
    {
      printf ("mq_notify (q, { SIGEV_SIGNAL }) failed with: %m\n");
      result = 1;
    }

  ev.sigev_value.sival_ptr = &ev;
  if (mq_notify (q, &ev) == 0)
    {
      puts ("second mq_notify (q, { SIGEV_SIGNAL }) unexpectedly succeeded");
      result = 1;
    }
  else if (errno != EBUSY)
    {
      printf ("second mq_notify (q, { SIGEV_SIGNAL }) failed with: %m\n");
      result = 1;
    }

  if (rtmin_cnt != 0)
    {
      puts ("SIGRTMIN signal caught too early");
      result = 1;
    }

  result |= mqsend (q);

  if (rtmin_cnt != 1)
    {
      puts ("SIGRTMIN signal did not arrive");
      result = 1;
    }
  else if (rtmin_pid != getpid ()
	   || rtmin_uid != getuid ()
	   || rtmin_code != SI_MESGQ
	   || rtmin_sigval.sival_int != 26)
    {
      printf ("unexpected siginfo_t fields: pid %u (%u), uid %u (%u), code %d (%d), si_int %d (26)\n",
	      rtmin_pid, getpid (), rtmin_uid, getuid (),
	      rtmin_code, SI_MESGQ, rtmin_sigval.sival_int);
      result = 1;
    }

  ev.sigev_value.sival_int = 75;
  if (mq_notify (q, &ev) != 0)
    {
      printf ("third mq_notify (q, { SIGEV_SIGNAL }) failed with: %m\n");
      result = 1;
    }

  result |= mqrecv (q);

  if (mq_notify (q, NULL) != 0)
    {
      printf ("mq_notify (q, NULL) failed with: %m\n");
      result = 1;
    }

  memset (&ev, 0x33, sizeof (ev));
  ev.sigev_notify = SIGEV_NONE;
  if (mq_notify (q, &ev) != 0)
    {
      printf ("fourth mq_notify (q, { SIGEV_NONE }) failed with: %m\n");
      result = 1;
    }

  pid_t pid = fork ();
  if (pid == -1)
    {
      printf ("fork () failed: %m\n");
      mq_unlink (name);
      return 1;
    }

  if (pid == 0)
    do_child (name, b2, b3, q);

  /* Child unsuccessfully attempts to mq_notify.  */

  (void) pthread_barrier_wait (b2);

  result |= mqsend (q);

  (void) pthread_barrier_wait (b2);

  /* Child successfully calls mq_notify SIGEV_SIGNAL now.  */

  result |= mqrecv (q);

  (void) pthread_barrier_wait (b2);

  memset (&ev, 0xbb, sizeof (ev));
  ev.sigev_notify = SIGEV_SIGNAL;
  ev.sigev_signo = SIGRTMIN;
  ev.sigev_value.sival_int = 15;
  if (mq_notify (q, &ev) == 0)
    {
      puts ("fourth mq_notify (q, { SIGEV_SIGNAL }) unexpectedly succeeded");
      result = 1;
    }
  else if (errno != EBUSY)
    {
      printf ("fourth mq_notify (q, { SIGEV_SIGNAL }) failed with: %m\n");
      result = 1;
    }

  result |= mqsend (q);

  if (mq_notify (q, &ev) != 0)
    {
      printf ("fifth mq_notify (q, { SIGEV_SIGNAL }) failed with: %m\n");
      result = 1;
    }

  if (rtmin_cnt != 1)
    {
      puts ("SIGRTMIN signal caught too early");
      result = 1;
    }

  result |= mqrecv (q);

  (void) pthread_barrier_wait (b2);

  /* Child verifies caught SIGRTMIN signal.  */
  /* Child calls mq_send (q) which triggers SIGRTMIN signal here.  */

  (void) pthread_barrier_wait (b2);

  /* Child mq_open's another mqd_t for the same queue (q2).  */

  if (rtmin_cnt != 2)
    {
      puts ("SIGRTMIN signal did not arrive");
      result = 1;
    }
  else if (rtmin_pid != pid
	   || rtmin_uid != getuid ()
	   || rtmin_code != SI_MESGQ
	   || rtmin_sigval.sival_int != 15)
    {
      printf ("unexpected siginfo_t fields: pid %u (%u), uid %u (%u), code %d (%d), si_int %d (15)\n",
	      rtmin_pid, pid, rtmin_uid, getuid (),
	      rtmin_code, SI_MESGQ, rtmin_sigval.sival_int);
      result = 1;
    }

  result |= mqrecv (q);

  (void) pthread_barrier_wait (b2);

  /* Child successfully calls mq_notify { SIGEV_SIGNAL } on q2.  */

  (void) pthread_barrier_wait (b2);

  memset (&ev, 0xbb, sizeof (ev));
  ev.sigev_notify = SIGEV_NONE;
  if (mq_notify (q, &ev) == 0)
    {
      puts ("fifth mq_notify (q, { SIGEV_NONE }) unexpectedly succeeded");
      result = 1;
    }
  else if (errno != EBUSY)
    {
      printf ("fifth mq_notify (q, { SIGEV_NONE }) failed with: %m\n");
      result = 1;
    }

  (void) pthread_barrier_wait (b2);

  /* Child calls mq_close on q2, which makes the queue available again for
     notification.  */

  mqd_t q3 = mq_open (name, O_RDWR);
  if (q3 == (mqd_t) -1)
    {
      printf ("mq_open q3 in parent failed with: %m\n");
      result = 1;
    }

  (void) pthread_barrier_wait (b2);

  memset (&ev, 0x12, sizeof (ev));
  ev.sigev_notify = SIGEV_NONE;
  if (mq_notify (q3, &ev) != 0)
    {
      printf ("mq_notify (q3, { SIGEV_NONE }) failed with: %m\n");
      result = 1;
    }

  (void) pthread_barrier_wait (b2);

  /* Child unsuccessfully attempts to mq_notify { SIGEV_SIGNAL } on q.  */

  (void) pthread_barrier_wait (b2);

  if (mq_close (q3) != 0)
    {
      printf ("mq_close failed: %m\n");
      result = 1;
    }

  (void) pthread_barrier_wait (b2);

  /* Child successfully calls mq_notify { SIGEV_NONE } on q.  */
  /* Child successfully calls mq_notify NULL on q.  */

  (void) pthread_barrier_wait (b2);

  /* Child creates new thread.  */
  /* Thread blocks on mqrecv (q).  */
  /* Child sleeps for 1sec so that thread has time to reach that point.  */
  /* Child successfully calls mq_notify { SIGEV_SIGNAL } on q.  */

  (void) pthread_barrier_wait (b2);

  result |= mqsend (q);

  (void) pthread_barrier_wait (b3);

  /* Child verifies SIGRTMIN has not been sent.  */

  (void) pthread_barrier_wait (b3);

  result |= mqsend (q);

  (void) pthread_barrier_wait (b3);

  /* Thread verifies SIGRTMIN has been caught.  */
  /* Thread calls mq_notify (q, { SIGEV_NONE }) to verify notification is now
     available for registration.  */
  /* Thread calls mq_notify (q, NULL).  */

  (void) pthread_barrier_wait (b3);

  /* Child calls mq_notify (q, { SIGEV_SIGNAL }).  */

  (void) pthread_barrier_wait (b3);

  /* Thread calls mq_notify (q, NULL). */

  (void) pthread_barrier_wait (b3);

  result |= mqsend (q);
  result |= mqrecv (q);

  (void) pthread_barrier_wait (b3);

  /* Child verifies SIGRTMIN has not been sent.  */
  /* Child calls mq_notify (q, { SIGEV_SIGNAL }).  */

  (void) pthread_barrier_wait (b3);

  /* Thread opens a new O_RDONLY mqd_t (q4).  */
  /* Thread calls mq_notify (q4, NULL). */
  /* Thread calls mq_close (q4).  */

  (void) pthread_barrier_wait (b3);

  result |= mqsend (q);
  result |= mqrecv (q);

  (void) pthread_barrier_wait (b3);

  /* Child verifies SIGRTMIN has not been sent.  */
  /* Child calls mq_notify (q, { SIGEV_SIGNAL }).  */

  (void) pthread_barrier_wait (b3);

  /* Thread opens a new O_WRONLY mqd_t (q5).  */
  /* Thread calls mq_notify (q5, NULL). */
  /* Thread calls mq_close (q5).  */

  (void) pthread_barrier_wait (b3);

  result |= mqsend (q);
  result |= mqrecv (q);

  (void) pthread_barrier_wait (b3);

  /* Child verifies SIGRTMIN has not been sent.  */

  int status;
  if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
    {
      puts ("waitpid failed");
      kill (pid, SIGKILL);
      result = 1;
    }
  else if (!WIFEXITED (status) || WEXITSTATUS (status))
    {
      printf ("child failed with status %d\n", status);
      result = 1;
    }

  if (mq_unlink (name) != 0)
    {
      printf ("mq_unlink failed: %m\n");
      result = 1;
    }

  if (mq_close (q) != 0)
    {
      printf ("mq_close failed: %m\n");
      result = 1;
    }

  if (mq_notify (q, NULL) == 0)
    {
      puts ("mq_notify on closed mqd_t unexpectedly succeeded");
      result = 1;
    }
  else if (errno != EBADF)
    {
      printf ("mq_notify on closed mqd_t did not fail with EBADF: %m\n");
      result = 1;
    }

  memset (&ev, 0x55, sizeof (ev));
  ev.sigev_notify = SIGEV_NONE;
  if (mq_notify (q, &ev) == 0)
    {
      puts ("mq_notify on closed mqd_t unexpectedly succeeded");
      result = 1;
    }
  else if (errno != EBADF)
    {
      printf ("mq_notify on closed mqd_t did not fail with EBADF: %m\n");
      result = 1;
    }

  return result;
}
#else
# define TEST_FUNCTION 0
#endif

#include "../test-skeleton.c"