rt/tst-mqueue5.c

   1 /* Test mq_notify.
   2    Copyright (C) 2004-2021 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Jakub Jelinek <jakub@redhat.com>, 2004.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <errno.h>
  21 #include <fcntl.h>
  22 #include <mqueue.h>
  23 #include <limits.h>
  24 #include <signal.h>
  25 #include <stdint.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <sys/mman.h>
  30 #include <sys/time.h>
  31 #include <sys/wait.h>
  32 #include <time.h>
  33 #include <unistd.h>
  34 #include "tst-mqueue.h"
  35
  36 #if _POSIX_THREADS && defined SIGRTMIN && defined SA_SIGINFO
  37 # include <pthread.h>
  38
  39 volatile int rtmin_cnt;
  40 volatile pid_t rtmin_pid;
  41 volatile uid_t rtmin_uid;
  42 volatile int rtmin_code;
  43 volatile union sigval rtmin_sigval;
  44
  45 static void
  46 rtmin_handler (int sig, siginfo_t *info, void *ctx)
  47 {
  48   if (sig != SIGRTMIN)
  49     abort ();
  50   ++rtmin_cnt;
  51   rtmin_pid = info->si_pid;
  52   rtmin_uid = info->si_uid;
  53   rtmin_code = info->si_code;
  54   rtmin_sigval = info->si_value;
  55 }
  56
  57 #define mqsend(q) (mqsend) (q, __LINE__)
  58 static int
  59 (mqsend) (mqd_t q, int line)
  60 {
  61   char c;
  62   if (mq_send (q, &c, 1, 1) != 0)
  63     {
  64       printf ("mq_send on line %d failed with: %m\n", line);
  65       return 1;
  66     }
  67   return 0;
  68 }
  69
  70 #define mqrecv(q) (mqrecv) (q, __LINE__)
  71 static int
  72 (mqrecv) (mqd_t q, int line)
  73 {
  74   char c;
  75   ssize_t rets = TEMP_FAILURE_RETRY (mq_receive (q, &c, 1, NULL));
  76   if (rets != 1)
  77     {
  78       if (rets == -1)
  79         printf ("mq_receive on line %d failed with: %m\n", line);
  80       else
  81         printf ("mq_receive on line %d returned %zd != 1\n",
  82                 line, rets);
  83       return 1;
  84     }
  85   return 0;
  86 }
  87
  88 struct thr_data
  89 {
  90   const char *name;
  91   pthread_barrier_t *b3;
  92   mqd_t q;
  93 };
  94
  95 static void *
  96 thr (void *arg)
  97 {
  98   pthread_barrier_t *b3 = ((struct thr_data *)arg)->b3;
  99   mqd_t q = ((struct thr_data *)arg)->q;
 100   const char *name = ((struct thr_data *)arg)->name;
 101   int result = 0;
 102
 103   result |= mqrecv (q);
 104
 105   (void) pthread_barrier_wait (b3);
 106
 107   /* Child verifies SIGRTMIN has not been sent.  */
 108
 109   (void) pthread_barrier_wait (b3);
 110
 111   /* Parent calls mqsend (q), which should trigger notification.  */
 112
 113   (void) pthread_barrier_wait (b3);
 114
 115   if (rtmin_cnt != 2)
 116     {
 117       puts ("SIGRTMIN signal in thread did not arrive");
 118       result = 1;
 119     }
 120   else if (rtmin_pid != getppid ()
 121            || rtmin_uid != getuid ()
 122            || rtmin_code != SI_MESGQ
 123            || rtmin_sigval.sival_int != 0xdeadbeef)
 124     {
 125       printf ("unexpected siginfo_t fields: pid %u (%u), uid %u (%u), code %d (%d), si_int %d (%d)\n",
 126               rtmin_pid, getppid (), rtmin_uid, getuid (),
 127               rtmin_code, SI_MESGQ, rtmin_sigval.sival_int, 0xdeadbeef);
 128       result = 1;
 129     }
 130
 131   struct sigevent ev;
 132   memset (&ev, 0x82, sizeof (ev));
 133   ev.sigev_notify = SIGEV_NONE;
 134   if (mq_notify (q, &ev) != 0)
 135     {
 136       printf ("mq_notify in thread (q, { SIGEV_NONE }) failed with: %m\n");
 137       result = 1;
 138     }
 139
 140   if (mq_notify (q, NULL) != 0)
 141     {
 142       printf ("mq_notify in thread (q, NULL) failed with: %m\n");
 143       result = 1;
 144     }
 145
 146   result |= mqrecv (q);
 147
 148   (void) pthread_barrier_wait (b3);
 149
 150   /* Child calls mq_notify (q, { SIGEV_SIGNAL }).  */
 151
 152   (void) pthread_barrier_wait (b3);
 153
 154   if (mq_notify (q, NULL) != 0)
 155     {
 156       printf ("second mq_notify in thread (q, NULL) failed with: %m\n");
 157       result = 1;
 158     }
 159
 160   (void) pthread_barrier_wait (b3);
 161
 162   /* Parent calls mqsend (q), which should not trigger notification.  */
 163
 164   (void) pthread_barrier_wait (b3);
 165
 166   /* Child verifies SIGRTMIN has not been received.  */
 167   /* Child calls mq_notify (q, { SIGEV_SIGNAL }).  */
 168
 169   (void) pthread_barrier_wait (b3);
 170
 171   mqd_t q4 = mq_open (name, O_RDONLY);
 172   if (q4 == (mqd_t) -1)
 173     {
 174       printf ("mq_open in thread failed with: %m\n");
 175       result = 1;
 176     }
 177
 178   if (mq_notify (q4, NULL) != 0)
 179     {
 180       printf ("mq_notify in thread (q4, NULL) failed with: %m\n");
 181       result = 1;
 182     }
 183
 184   if (mq_close (q4) != 0)
 185     {
 186       printf ("mq_close in thread failed with: %m\n");
 187       result = 1;
 188     }
 189
 190   (void) pthread_barrier_wait (b3);
 191
 192   /* Parent calls mqsend (q), which should not trigger notification.  */
 193
 194   (void) pthread_barrier_wait (b3);
 195
 196   /* Child verifies SIGRTMIN has not been received.  */
 197   /* Child calls mq_notify (q, { SIGEV_SIGNAL }).  */
 198
 199   (void) pthread_barrier_wait (b3);
 200
 201   mqd_t q5 = mq_open (name, O_WRONLY);
 202   if (q5 == (mqd_t) -1)
 203     {
 204       printf ("mq_open O_WRONLY in thread failed with: %m\n");
 205       result = 1;
 206     }
 207
 208   if (mq_notify (q5, NULL) != 0)
 209     {
 210       printf ("mq_notify in thread (q5, NULL) failed with: %m\n");
 211       result = 1;
 212     }
 213
 214   if (mq_close (q5) != 0)
 215     {
 216       printf ("mq_close in thread failed with: %m\n");
 217       result = 1;
 218     }
 219
 220   (void) pthread_barrier_wait (b3);
 221
 222   /* Parent calls mqsend (q), which should not trigger notification.  */
 223
 224   (void) pthread_barrier_wait (b3);
 225
 226   /* Child verifies SIGRTMIN has not been received.  */
 227
 228   return (void *) (long) result;
 229 }
 230
 231 static void
 232 do_child (const char *name, pthread_barrier_t *b2, pthread_barrier_t *b3,
 233           mqd_t q)
 234 {
 235   int result = 0;
 236
 237   struct sigevent ev;
 238   memset (&ev, 0x55, sizeof (ev));
 239   ev.sigev_notify = SIGEV_SIGNAL;
 240   ev.sigev_signo = SIGRTMIN;
 241   ev.sigev_value.sival_ptr = &ev;
 242   if (mq_notify (q, &ev) == 0)
 243     {
 244       puts ("first mq_notify in child (q, { SIGEV_SIGNAL }) unexpectedly succeeded");
 245       result = 1;
 246     }
 247   else if (errno != EBUSY)
 248     {
 249       printf ("first mq_notify in child (q, { SIGEV_SIGNAL }) failed with: %m\n");
 250       result = 1;
 251     }
 252
 253   (void) pthread_barrier_wait (b2);
 254
 255   /* Parent calls mqsend (q), which makes notification available.  */
 256
 257   (void) pthread_barrier_wait (b2);
 258
 259   rtmin_cnt = 0;
 260
 261   if (mq_notify (q, &ev) != 0)
 262     {
 263       printf ("second mq_notify in child (q, { SIGEV_SIGNAL }) failed with: %m\n");
 264       result = 1;
 265     }
 266
 267   if (rtmin_cnt != 0)
 268     {
 269       puts ("SIGRTMIN signal in child caught too early");
 270       result = 1;
 271     }
 272
 273   (void) pthread_barrier_wait (b2);
 274
 275   /* Parent unsuccessfully attempts to mq_notify.  */
 276   /* Parent calls mqsend (q), which makes notification available
 277      and triggers a signal in the child.  */
 278   /* Parent successfully calls mq_notify SIGEV_SIGNAL.  */
 279
 280   (void) pthread_barrier_wait (b2);
 281
 282   if (rtmin_cnt != 1)
 283     {
 284       puts ("SIGRTMIN signal in child did not arrive");
 285       result = 1;
 286     }
 287   else if (rtmin_pid != getppid ()
 288            || rtmin_uid != getuid ()
 289            || rtmin_code != SI_MESGQ
 290            || rtmin_sigval.sival_ptr != &ev)
 291     {
 292       printf ("unexpected siginfo_t fields: pid %u (%u), uid %u (%u), code %d (%d), si_ptr %p (%p)\n",
 293               rtmin_pid, getppid (), rtmin_uid, getuid (),
 294               rtmin_code, SI_MESGQ, rtmin_sigval.sival_ptr, &ev);
 295       result = 1;
 296     }
 297
 298   result |= mqsend (q);
 299
 300   (void) pthread_barrier_wait (b2);
 301
 302   /* Parent verifies caught SIGRTMIN.  */
 303
 304   mqd_t q2 = mq_open (name, O_RDWR);
 305   if (q2 == (mqd_t) -1)
 306     {
 307       printf ("mq_open in child failed with: %m\n");
 308       result = 1;
 309     }
 310
 311   (void) pthread_barrier_wait (b2);
 312
 313   /* Parent mq_open's another mqd_t for the same queue (q3).  */
 314
 315   memset (&ev, 0x11, sizeof (ev));
 316   ev.sigev_notify = SIGEV_SIGNAL;
 317   ev.sigev_signo = SIGRTMIN;
 318   ev.sigev_value.sival_ptr = &ev;
 319   if (mq_notify (q2, &ev) != 0)
 320     {
 321       printf ("mq_notify in child (q2, { SIGEV_SIGNAL }) failed with: %m\n");
 322       result = 1;
 323     }
 324
 325   (void) pthread_barrier_wait (b2);
 326
 327   /* Parent unsuccessfully attempts to mq_notify { SIGEV_NONE } on q.  */
 328
 329   (void) pthread_barrier_wait (b2);
 330
 331   if (mq_close (q2) != 0)
 332     {
 333       printf ("mq_close failed: %m\n");
 334       result = 1;
 335     }
 336
 337   (void) pthread_barrier_wait (b2);
 338
 339   /* Parent successfully calls mq_notify { SIGEV_NONE } on q3.  */
 340
 341   (void) pthread_barrier_wait (b2);
 342
 343   memset (&ev, 0xbb, sizeof (ev));
 344   ev.sigev_notify = SIGEV_SIGNAL;
 345   ev.sigev_signo = SIGRTMIN;
 346   ev.sigev_value.sival_ptr = &b2;
 347   if (mq_notify (q, &ev) == 0)
 348     {
 349       puts ("third mq_notify in child (q, { SIGEV_SIGNAL }) unexpectedly succeeded");
 350       result = 1;
 351     }
 352   else if (errno != EBUSY)
 353     {
 354       printf ("third mq_notify in child (q, { SIGEV_SIGNAL }) failed with: %m\n");
 355       result = 1;
 356     }
 357
 358   (void) pthread_barrier_wait (b2);
 359
 360   /* Parent calls mq_close on q3, which makes the queue available again for
 361      notification.  */
 362
 363   (void) pthread_barrier_wait (b2);
 364
 365   memset (&ev, 0x13, sizeof (ev));
 366   ev.sigev_notify = SIGEV_NONE;
 367   if (mq_notify (q, &ev) != 0)
 368     {
 369       printf ("mq_notify in child (q, { SIGEV_NONE }) failed with: %m\n");
 370       result = 1;
 371     }
 372
 373   if (mq_notify (q, NULL) != 0)
 374     {
 375       printf ("mq_notify in child (q, NULL) failed with: %m\n");
 376       result = 1;
 377     }
 378
 379   (void) pthread_barrier_wait (b2);
 380
 381   struct thr_data thr_data = { .name = name, .b3 = b3, .q = q };
 382   pthread_t th;
 383   int ret = pthread_create (&th, NULL, thr, &thr_data);
 384   if (ret)
 385     {
 386       errno = ret;
 387       printf ("pthread_created failed with: %m\n");
 388       result = 1;
 389     }
 390
 391   /* Wait till thr calls mq_receive on the empty queue q and blocks on it.  */
 392   sleep (1);
 393
 394   memset (&ev, 0x5f, sizeof (ev));
 395   ev.sigev_notify = SIGEV_SIGNAL;
 396   ev.sigev_signo = SIGRTMIN;
 397   ev.sigev_value.sival_int = 0xdeadbeef;
 398   if (mq_notify (q, &ev) != 0)
 399     {
 400       printf ("fourth mq_notify in child (q, { SIGEV_SIGNAL }) failed with: %m\n");
 401       result = 1;
 402     }
 403
 404   /* Ensure the thr thread gets the signal, not us.  */
 405   sigset_t set;
 406   sigemptyset (&set);
 407   sigaddset (&set, SIGRTMIN);
 408   if (pthread_sigmask (SIG_BLOCK, &set, NULL))
 409     {
 410       printf ("Failed to block SIGRTMIN in child: %m\n");
 411       result = 1;
 412     }
 413
 414   (void) pthread_barrier_wait (b2);
 415
 416   /* Parent calls mqsend (q), which should wake up mqrecv (q)
 417      in the thread but no notification should be sent.  */
 418
 419   (void) pthread_barrier_wait (b3);
 420
 421   if (rtmin_cnt != 1)
 422     {
 423       puts ("SIGRTMIN signal caught while thr was blocked on mq_receive");
 424       result = 1;
 425     }
 426
 427   (void) pthread_barrier_wait (b3);
 428
 429   /* Parent calls mqsend (q), which should trigger notification.  */
 430
 431   (void) pthread_barrier_wait (b3);
 432
 433   /* Thread verifies SIGRTMIN has been received.  */
 434   /* Thread calls mq_notify (q, { SIGEV_NONE }) to verify notification is now
 435      available for registration.  */
 436   /* Thread calls mq_notify (q, NULL).  */
 437
 438   (void) pthread_barrier_wait (b3);
 439
 440   memset (&ev, 0x6a, sizeof (ev));
 441   ev.sigev_notify = SIGEV_SIGNAL;
 442   ev.sigev_signo = SIGRTMIN;
 443   ev.sigev_value.sival_ptr = do_child;
 444   if (mq_notify (q, &ev) != 0)
 445     {
 446       printf ("fifth mq_notify in child (q, { SIGEV_SIGNAL }) failed with: %m\n");
 447       result = 1;
 448     }
 449
 450   (void) pthread_barrier_wait (b3);
 451
 452   /* Thread calls mq_notify (q, NULL), which should unregister the above
 453      notification.  */
 454
 455   (void) pthread_barrier_wait (b3);
 456
 457   /* Parent calls mqsend (q), which should not trigger notification.  */
 458
 459   (void) pthread_barrier_wait (b3);
 460
 461   if (rtmin_cnt != 2)
 462     {
 463       puts ("SIGRTMIN signal caught while notification has been disabled");
 464       result = 1;
 465     }
 466
 467   memset (&ev, 0x7b, sizeof (ev));
 468   ev.sigev_notify = SIGEV_SIGNAL;
 469   ev.sigev_signo = SIGRTMIN;
 470   ev.sigev_value.sival_ptr = thr;
 471   if (mq_notify (q, &ev) != 0)
 472     {
 473       printf ("sixth mq_notify in child (q, { SIGEV_SIGNAL }) failed with: %m\n");
 474       result = 1;
 475     }
 476
 477   (void) pthread_barrier_wait (b3);
 478
 479   /* Thread opens a new O_RDONLY mqd_t (q4).  */
 480   /* Thread calls mq_notify (q4, NULL), which should unregister the above
 481      notification.  */
 482   /* Thread calls mq_close (q4).  */
 483
 484   (void) pthread_barrier_wait (b3);
 485
 486   /* Parent calls mqsend (q), which should not trigger notification.  */
 487
 488   (void) pthread_barrier_wait (b3);
 489
 490   if (rtmin_cnt != 2)
 491     {
 492       puts ("SIGRTMIN signal caught while notification has been disabled");
 493       result = 1;
 494     }
 495
 496   memset (&ev, 0xe1, sizeof (ev));
 497   ev.sigev_notify = SIGEV_SIGNAL;
 498   ev.sigev_signo = SIGRTMIN;
 499   ev.sigev_value.sival_int = 127;
 500   if (mq_notify (q, &ev) != 0)
 501     {
 502       printf ("seventh mq_notify in child (q, { SIGEV_SIGNAL }) failed with: %m\n");
 503       result = 1;
 504     }
 505
 506   (void) pthread_barrier_wait (b3);
 507
 508   /* Thread opens a new O_WRONLY mqd_t (q5).  */
 509   /* Thread calls mq_notify (q5, NULL), which should unregister the above
 510      notification.  */
 511   /* Thread calls mq_close (q5).  */
 512
 513   (void) pthread_barrier_wait (b3);
 514
 515   /* Parent calls mqsend (q), which should not trigger notification.  */
 516
 517   (void) pthread_barrier_wait (b3);
 518
 519   if (rtmin_cnt != 2)
 520     {
 521       puts ("SIGRTMIN signal caught while notification has been disabled");
 522       result = 1;
 523     }
 524
 525   /* Reenable test signals before cleaning up the thread.  */
 526   if (pthread_sigmask (SIG_UNBLOCK, &set, NULL))
 527     {
 528       printf ("Failed to unblock SIGRTMIN in child: %m\n");
 529       result = 1;
 530     }
 531
 532   void *thr_ret;
 533   ret = pthread_join (th, &thr_ret);
 534   if (ret)
 535     {
 536       errno = ret;
 537       printf ("pthread_join failed: %m\n");
 538       result = 1;
 539     }
 540   else if (thr_ret)
 541     result = 1;
 542
 543   if (mq_close (q) != 0)
 544     {
 545       printf ("mq_close failed: %m\n");
 546       result = 1;
 547     }
 548
 549   exit (result);
 550 }
 551
 552 #define TEST_FUNCTION do_test ()
 553 static int
 554 do_test (void)
 555 {
 556   int result = 0;
 557
 558   char tmpfname[] = "/tmp/tst-mqueue5-barrier.XXXXXX";
 559   int fd = mkstemp (tmpfname);
 560   if (fd == -1)
 561     {
 562       printf ("cannot open temporary file: %m\n");
 563       return 1;
 564     }
 565
 566   /* Make sure it is always removed.  */
 567   unlink (tmpfname);
 568
 569   /* Create one page of data.  */
 570   size_t ps = sysconf (_SC_PAGESIZE);
 571   char data[ps];
 572   memset (data, '\0', ps);
 573
 574   /* Write the data to the file.  */
 575   if (write (fd, data, ps) != (ssize_t) ps)
 576     {
 577       puts ("short write");
 578       return 1;
 579     }
 580
 581   void *mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
 582   if (mem == MAP_FAILED)
 583     {
 584       printf ("mmap failed: %m\n");
 585       return 1;
 586     }
 587
 588   pthread_barrier_t *b2;
 589   b2 = (pthread_barrier_t *) (((uintptr_t) mem + __alignof (pthread_barrier_t))
 590                               & ~(__alignof (pthread_barrier_t) - 1));
 591
 592   pthread_barrier_t *b3;
 593   b3 = b2 + 1;
 594
 595   pthread_barrierattr_t a;
 596   if (pthread_barrierattr_init (&a) != 0)
 597     {
 598       puts ("barrierattr_init failed");
 599       return 1;
 600     }
 601
 602   if (pthread_barrierattr_setpshared (&a, PTHREAD_PROCESS_SHARED) != 0)
 603     {
 604       puts ("barrierattr_setpshared failed, could not test");
 605       return 0;
 606     }
 607
 608   if (pthread_barrier_init (b2, &a, 2) != 0)
 609     {
 610       puts ("barrier_init failed");
 611       return 1;
 612     }
 613
 614   if (pthread_barrier_init (b3, &a, 3) != 0)
 615     {
 616       puts ("barrier_init failed");
 617       return 1;
 618     }
 619
 620   if (pthread_barrierattr_destroy (&a) != 0)
 621     {
 622       puts ("barrierattr_destroy failed");
 623       return 1;
 624     }
 625
 626   char name[sizeof "/tst-mqueue5-" + sizeof (pid_t) * 3];
 627   snprintf (name, sizeof (name), "/tst-mqueue5-%u", getpid ());
 628
 629   struct mq_attr attr = { .mq_maxmsg = 1, .mq_msgsize = 1 };
 630   mqd_t q = mq_open (name, O_CREAT | O_EXCL | O_RDWR, 0600, &attr);
 631
 632   if (q == (mqd_t) -1)
 633     {
 634       printf ("mq_open failed with: %m\n");
 635       return result;
 636     }
 637   else
 638     add_temp_mq (name);
 639
 640   struct sigevent ev;
 641   memset (&ev, 0xaa, sizeof (ev));
 642   ev.sigev_notify = SIGEV_NONE;
 643   if (mq_notify (q, &ev) != 0)
 644     {
 645       printf ("mq_notify (q, { SIGEV_NONE }) failed with: %m\n");
 646       result = 1;
 647     }
 648
 649   if (mq_notify (q, &ev) == 0)
 650     {
 651       puts ("second mq_notify (q, { SIGEV_NONE }) unexpectedly succeeded");
 652       result = 1;
 653     }
 654   else if (errno != EBUSY)
 655     {
 656       printf ("second mq_notify (q, { SIGEV_NONE }) failed with: %m\n");
 657       result = 1;
 658     }
 659
 660   result |= mqsend (q);
 661
 662   if (mq_notify (q, &ev) != 0)
 663     {
 664       printf ("third mq_notify (q, { SIGEV_NONE }) failed with: %m\n");
 665       result = 1;
 666     }
 667
 668   result |= mqrecv (q);
 669
 670   if (mq_notify (q, NULL) != 0)
 671     {
 672       printf ("mq_notify (q, NULL) failed with: %m\n");
 673       result = 1;
 674     }
 675
 676   if (mq_notify (q, NULL) != 0)
 677     {
 678       /* Implementation-defined behaviour, so don't fail,
 679          just inform.  */
 680       printf ("second mq_notify (q, NULL) failed with: %m\n");
 681     }
 682
 683   struct sigaction sa = { .sa_sigaction = rtmin_handler,
 684                           .sa_flags = SA_SIGINFO };
 685   sigemptyset (&sa.sa_mask);
 686   sigaction (SIGRTMIN, &sa, NULL);
 687
 688   memset (&ev, 0x55, sizeof (ev));
 689   ev.sigev_notify = SIGEV_SIGNAL;
 690   ev.sigev_signo = SIGRTMIN;
 691   ev.sigev_value.sival_int = 26;
 692   if (mq_notify (q, &ev) != 0)
 693     {
 694       printf ("mq_notify (q, { SIGEV_SIGNAL }) failed with: %m\n");
 695       result = 1;
 696     }
 697
 698   ev.sigev_value.sival_ptr = &ev;
 699   if (mq_notify (q, &ev) == 0)
 700     {
 701       puts ("second mq_notify (q, { SIGEV_SIGNAL }) unexpectedly succeeded");
 702       result = 1;
 703     }
 704   else if (errno != EBUSY)
 705     {
 706       printf ("second mq_notify (q, { SIGEV_SIGNAL }) failed with: %m\n");
 707       result = 1;
 708     }
 709
 710   if (rtmin_cnt != 0)
 711     {
 712       puts ("SIGRTMIN signal caught too early");
 713       result = 1;
 714     }
 715
 716   result |= mqsend (q);
 717
 718   if (rtmin_cnt != 1)
 719     {
 720       puts ("SIGRTMIN signal did not arrive");
 721       result = 1;
 722     }
 723   else if (rtmin_pid != getpid ()
 724            || rtmin_uid != getuid ()
 725            || rtmin_code != SI_MESGQ
 726            || rtmin_sigval.sival_int != 26)
 727     {
 728       printf ("unexpected siginfo_t fields: pid %u (%u), uid %u (%u), code %d (%d), si_int %d (26)\n",
 729               rtmin_pid, getpid (), rtmin_uid, getuid (),
 730               rtmin_code, SI_MESGQ, rtmin_sigval.sival_int);
 731       result = 1;
 732     }
 733
 734   ev.sigev_value.sival_int = 75;
 735   if (mq_notify (q, &ev) != 0)
 736     {
 737       printf ("third mq_notify (q, { SIGEV_SIGNAL }) failed with: %m\n");
 738       result = 1;
 739     }
 740
 741   result |= mqrecv (q);
 742
 743   if (mq_notify (q, NULL) != 0)
 744     {
 745       printf ("mq_notify (q, NULL) failed with: %m\n");
 746       result = 1;
 747     }
 748
 749   memset (&ev, 0x33, sizeof (ev));
 750   ev.sigev_notify = SIGEV_NONE;
 751   if (mq_notify (q, &ev) != 0)
 752     {
 753       printf ("fourth mq_notify (q, { SIGEV_NONE }) failed with: %m\n");
 754       result = 1;
 755     }
 756
 757   pid_t pid = fork ();
 758   if (pid == -1)
 759     {
 760       printf ("fork () failed: %m\n");
 761       mq_unlink (name);
 762       return 1;
 763     }
 764
 765   if (pid == 0)
 766     do_child (name, b2, b3, q);
 767
 768   /* Child unsuccessfully attempts to mq_notify.  */
 769
 770   (void) pthread_barrier_wait (b2);
 771
 772   result |= mqsend (q);
 773
 774   (void) pthread_barrier_wait (b2);
 775
 776   /* Child successfully calls mq_notify SIGEV_SIGNAL now.  */
 777
 778   result |= mqrecv (q);
 779
 780   (void) pthread_barrier_wait (b2);
 781
 782   memset (&ev, 0xbb, sizeof (ev));
 783   ev.sigev_notify = SIGEV_SIGNAL;
 784   ev.sigev_signo = SIGRTMIN;
 785   ev.sigev_value.sival_int = 15;
 786   if (mq_notify (q, &ev) == 0)
 787     {
 788       puts ("fourth mq_notify (q, { SIGEV_SIGNAL }) unexpectedly succeeded");
 789       result = 1;
 790     }
 791   else if (errno != EBUSY)
 792     {
 793       printf ("fourth mq_notify (q, { SIGEV_SIGNAL }) failed with: %m\n");
 794       result = 1;
 795     }
 796
 797   result |= mqsend (q);
 798
 799   if (mq_notify (q, &ev) != 0)
 800     {
 801       printf ("fifth mq_notify (q, { SIGEV_SIGNAL }) failed with: %m\n");
 802       result = 1;
 803     }
 804
 805   if (rtmin_cnt != 1)
 806     {
 807       puts ("SIGRTMIN signal caught too early");
 808       result = 1;
 809     }
 810
 811   result |= mqrecv (q);
 812
 813   (void) pthread_barrier_wait (b2);
 814
 815   /* Child verifies caught SIGRTMIN signal.  */
 816   /* Child calls mq_send (q) which triggers SIGRTMIN signal here.  */
 817
 818   (void) pthread_barrier_wait (b2);
 819
 820   /* Child mq_open's another mqd_t for the same queue (q2).  */
 821
 822   if (rtmin_cnt != 2)
 823     {
 824       puts ("SIGRTMIN signal did not arrive");
 825       result = 1;
 826     }
 827   else if (rtmin_pid != pid
 828            || rtmin_uid != getuid ()
 829            || rtmin_code != SI_MESGQ
 830            || rtmin_sigval.sival_int != 15)
 831     {
 832       printf ("unexpected siginfo_t fields: pid %u (%u), uid %u (%u), code %d (%d), si_int %d (15)\n",
 833               rtmin_pid, pid, rtmin_uid, getuid (),
 834               rtmin_code, SI_MESGQ, rtmin_sigval.sival_int);
 835       result = 1;
 836     }
 837
 838   result |= mqrecv (q);
 839
 840   (void) pthread_barrier_wait (b2);
 841
 842   /* Child successfully calls mq_notify { SIGEV_SIGNAL } on q2.  */
 843
 844   (void) pthread_barrier_wait (b2);
 845
 846   memset (&ev, 0xbb, sizeof (ev));
 847   ev.sigev_notify = SIGEV_NONE;
 848   if (mq_notify (q, &ev) == 0)
 849     {
 850       puts ("fifth mq_notify (q, { SIGEV_NONE }) unexpectedly succeeded");
 851       result = 1;
 852     }
 853   else if (errno != EBUSY)
 854     {
 855       printf ("fifth mq_notify (q, { SIGEV_NONE }) failed with: %m\n");
 856       result = 1;
 857     }
 858
 859   (void) pthread_barrier_wait (b2);
 860
 861   /* Child calls mq_close on q2, which makes the queue available again for
 862      notification.  */
 863
 864   mqd_t q3 = mq_open (name, O_RDWR);
 865   if (q3 == (mqd_t) -1)
 866     {
 867       printf ("mq_open q3 in parent failed with: %m\n");
 868       result = 1;
 869     }
 870
 871   (void) pthread_barrier_wait (b2);
 872
 873   memset (&ev, 0x12, sizeof (ev));
 874   ev.sigev_notify = SIGEV_NONE;
 875   if (mq_notify (q3, &ev) != 0)
 876     {
 877       printf ("mq_notify (q3, { SIGEV_NONE }) failed with: %m\n");
 878       result = 1;
 879     }
 880
 881   (void) pthread_barrier_wait (b2);
 882
 883   /* Child unsuccessfully attempts to mq_notify { SIGEV_SIGNAL } on q.  */
 884
 885   (void) pthread_barrier_wait (b2);
 886
 887   if (mq_close (q3) != 0)
 888     {
 889       printf ("mq_close failed: %m\n");
 890       result = 1;
 891     }
 892
 893   (void) pthread_barrier_wait (b2);
 894
 895   /* Child successfully calls mq_notify { SIGEV_NONE } on q.  */
 896   /* Child successfully calls mq_notify NULL on q.  */
 897
 898   (void) pthread_barrier_wait (b2);
 899
 900   /* Child creates new thread.  */
 901   /* Thread blocks on mqrecv (q).  */
 902   /* Child sleeps for 1sec so that thread has time to reach that point.  */
 903   /* Child successfully calls mq_notify { SIGEV_SIGNAL } on q.  */
 904
 905   (void) pthread_barrier_wait (b2);
 906
 907   result |= mqsend (q);
 908
 909   (void) pthread_barrier_wait (b3);
 910
 911   /* Child verifies SIGRTMIN has not been sent.  */
 912
 913   (void) pthread_barrier_wait (b3);
 914
 915   result |= mqsend (q);
 916
 917   (void) pthread_barrier_wait (b3);
 918
 919   /* Thread verifies SIGRTMIN has been caught.  */
 920   /* Thread calls mq_notify (q, { SIGEV_NONE }) to verify notification is now
 921      available for registration.  */
 922   /* Thread calls mq_notify (q, NULL).  */
 923
 924   (void) pthread_barrier_wait (b3);
 925
 926   /* Child calls mq_notify (q, { SIGEV_SIGNAL }).  */
 927
 928   (void) pthread_barrier_wait (b3);
 929
 930   /* Thread calls mq_notify (q, NULL). */
 931
 932   (void) pthread_barrier_wait (b3);
 933
 934   result |= mqsend (q);
 935   result |= mqrecv (q);
 936
 937   (void) pthread_barrier_wait (b3);
 938
 939   /* Child verifies SIGRTMIN has not been sent.  */
 940   /* Child calls mq_notify (q, { SIGEV_SIGNAL }).  */
 941
 942   (void) pthread_barrier_wait (b3);
 943
 944   /* Thread opens a new O_RDONLY mqd_t (q4).  */
 945   /* Thread calls mq_notify (q4, NULL). */
 946   /* Thread calls mq_close (q4).  */
 947
 948   (void) pthread_barrier_wait (b3);
 949
 950   result |= mqsend (q);
 951   result |= mqrecv (q);
 952
 953   (void) pthread_barrier_wait (b3);
 954
 955   /* Child verifies SIGRTMIN has not been sent.  */
 956   /* Child calls mq_notify (q, { SIGEV_SIGNAL }).  */
 957
 958   (void) pthread_barrier_wait (b3);
 959
 960   /* Thread opens a new O_WRONLY mqd_t (q5).  */
 961   /* Thread calls mq_notify (q5, NULL). */
 962   /* Thread calls mq_close (q5).  */
 963
 964   (void) pthread_barrier_wait (b3);
 965
 966   result |= mqsend (q);
 967   result |= mqrecv (q);
 968
 969   (void) pthread_barrier_wait (b3);
 970
 971   /* Child verifies SIGRTMIN has not been sent.  */
 972
 973   int status;
 974   if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
 975     {
 976       puts ("waitpid failed");
 977       kill (pid, SIGKILL);
 978       result = 1;
 979     }
 980   else if (!WIFEXITED (status) || WEXITSTATUS (status))
 981     {
 982       printf ("child failed with status %d\n", status);
 983       result = 1;
 984     }
 985
 986   if (mq_unlink (name) != 0)
 987     {
 988       printf ("mq_unlink failed: %m\n");
 989       result = 1;
 990     }
 991
 992   if (mq_close (q) != 0)
 993     {
 994       printf ("mq_close failed: %m\n");
 995       result = 1;
 996     }
 997
 998   if (mq_notify (q, NULL) == 0)
 999     {
1000       puts ("mq_notify on closed mqd_t unexpectedly succeeded");
1001       result = 1;
1002     }
1003   else if (errno != EBADF)
1004     {
1005       printf ("mq_notify on closed mqd_t did not fail with EBADF: %m\n");
1006       result = 1;
1007     }
1008
1009   memset (&ev, 0x55, sizeof (ev));
1010   ev.sigev_notify = SIGEV_NONE;
1011   if (mq_notify (q, &ev) == 0)
1012     {
1013       puts ("mq_notify on closed mqd_t unexpectedly succeeded");
1014       result = 1;
1015     }
1016   else if (errno != EBADF)
1017     {
1018       printf ("mq_notify on closed mqd_t did not fail with EBADF: %m\n");
1019       result = 1;
1020     }
1021
1022   return result;
1023 }
1024 #else
1025 # define TEST_FUNCTION 0
1026 #endif
1027
1028 #include "../test-skeleton.c"