summary refs log tree commit diff
path: root/posix/tst-waitid.c
blob: ad3df5a329aa688352a6880e6329b95bbe7e1044 (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
/* Tests for waitid.
   Copyright (C) 2004-2013 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   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
   <http://www.gnu.org/licenses/>.  */

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
#include <signal.h>

#define TIMEOUT 15

static void
test_child (void)
{
  /* Wait a second to be sure the parent set his variables before we
     produce a SIGCHLD.  */
  sleep (1);

  /* First thing, we stop ourselves.  */
  raise (SIGSTOP);

  /* Hey, we got continued!  */
  while (1)
    pause ();
}

#ifndef WEXITED
# define WEXITED	0
# define WCONTINUED	0
# define WSTOPPED	WUNTRACED
#endif

static sig_atomic_t expecting_sigchld, spurious_sigchld;
#ifdef SA_SIGINFO
static siginfo_t sigchld_info;

static void
sigchld (int signo, siginfo_t *info, void *ctx)
{
  if (signo != SIGCHLD)
    {
      printf ("SIGCHLD handler got signal %d instead!\n", signo);
      _exit (EXIT_FAILURE);
    }

  if (! expecting_sigchld)
    {
      spurious_sigchld = 1;
      printf ("spurious SIGCHLD: signo %d code %d status %d pid %d\n",
	      info->si_signo, info->si_code, info->si_status, info->si_pid);
    }
  else
    {
      sigchld_info = *info;
      expecting_sigchld = 0;
    }
}

static void
check_sigchld (const char *phase, int *ok, int code, int status, pid_t pid)
{
  if (expecting_sigchld)
    {
      printf ("missing SIGCHLD on %s\n", phase);
      *ok = EXIT_FAILURE;
      expecting_sigchld = 0;
      return;
    }

  if (sigchld_info.si_signo != SIGCHLD)
    {
      printf ("SIGCHLD for %s signal %d\n", phase, sigchld_info.si_signo);
      *ok = EXIT_FAILURE;
    }
  if (sigchld_info.si_code != code)
    {
      printf ("SIGCHLD for %s code %d\n", phase, sigchld_info.si_code);
      *ok = EXIT_FAILURE;
    }
  if (sigchld_info.si_status != status)
    {
      printf ("SIGCHLD for %s status %d\n", phase, sigchld_info.si_status);
      *ok = EXIT_FAILURE;
    }
  if (sigchld_info.si_pid != pid)
    {
      printf ("SIGCHLD for %s pid %d\n", phase, sigchld_info.si_pid);
      *ok = EXIT_FAILURE;
    }
}
# define CHECK_SIGCHLD(phase, code_check, status_check) \
  check_sigchld ((phase), &status, (code_check), (status_check), pid)
#else
# define CHECK_SIGCHLD(phase, code, status) ((void) 0)
#endif

static int
do_test (int argc, char *argv[])
{
#ifdef SA_SIGINFO
  struct sigaction sa;
  sa.sa_flags = SA_SIGINFO|SA_RESTART;
  sa.sa_sigaction = &sigchld;
  if (sigemptyset (&sa.sa_mask) < 0 || sigaction (SIGCHLD, &sa, NULL) < 0)
    {
      printf ("setting SIGCHLD handler: %m\n");
      return EXIT_FAILURE;
    }
#endif

  expecting_sigchld = 1;

  pid_t pid = fork ();
  if (pid < 0)
    {
      printf ("fork: %m\n");
      return EXIT_FAILURE;
    }
  else if (pid == 0)
    {
      test_child ();
      _exit (127);
    }

  int status = EXIT_SUCCESS;
#define RETURN(ok) \
    do { if (status == EXIT_SUCCESS) status = (ok); goto out; } while (0)

  /* Give the child a chance to stop.  */
  sleep (3);

  CHECK_SIGCHLD ("stopped", CLD_STOPPED, SIGSTOP);

  /* Now try a wait that should not succeed.  */
  siginfo_t info;
  info.si_signo = 0;		/* A successful call sets it to SIGCHLD.  */
  int fail = waitid (P_PID, pid, &info, WEXITED|WCONTINUED|WNOHANG);
  switch (fail)
    {
    default:
      printf ("waitid returned bogus value %d\n", fail);
      RETURN (EXIT_FAILURE);
    case -1:
      printf ("waitid WNOHANG on stopped: %m\n");
      RETURN (errno == ENOTSUP ? EXIT_SUCCESS : EXIT_FAILURE);
    case 0:
      if (info.si_signo == 0)
	break;
      if (info.si_signo == SIGCHLD)
	printf ("waitid WNOHANG on stopped status %d\n", info.si_status);
      else
	printf ("waitid WNOHANG on stopped signal %d\n", info.si_signo);
      RETURN (EXIT_FAILURE);
    }

  /* Next the wait that should succeed right away.  */
  info.si_signo = 0;		/* A successful call sets it to SIGCHLD.  */
  info.si_pid = -1;
  info.si_status = -1;
  fail = waitid (P_PID, pid, &info, WSTOPPED|WNOHANG);
  switch (fail)
    {
    default:
      printf ("waitid WSTOPPED|WNOHANG returned bogus value %d\n", fail);
      RETURN (EXIT_FAILURE);
    case -1:
      printf ("waitid WSTOPPED|WNOHANG on stopped: %m\n");
      RETURN (errno == ENOTSUP ? EXIT_SUCCESS : EXIT_FAILURE);
    case 0:
      if (info.si_signo != SIGCHLD)
	{
	  printf ("waitid WSTOPPED|WNOHANG on stopped signal %d\n",
		  info.si_signo);
	  RETURN (EXIT_FAILURE);
	}
      if (info.si_code != CLD_STOPPED)
	{
	  printf ("waitid WSTOPPED|WNOHANG on stopped code %d\n",
		  info.si_code);
	  RETURN (EXIT_FAILURE);
	}
      if (info.si_status != SIGSTOP)
	{
	  printf ("waitid WSTOPPED|WNOHANG on stopped status %d\n",
		  info.si_status);
	  RETURN (EXIT_FAILURE);
	}
      if (info.si_pid != pid)
	{
	  printf ("waitid WSTOPPED|WNOHANG on stopped pid %d != %d\n",
		  info.si_pid, pid);
	  RETURN (EXIT_FAILURE);
	}
    }

  expecting_sigchld = WCONTINUED != 0;

  if (kill (pid, SIGCONT) != 0)
    {
      printf ("kill (%d, SIGCONT): %m\n", pid);
      RETURN (EXIT_FAILURE);
    }

  /* Wait for the child to have continued.  */
  sleep (2);

#if WCONTINUED != 0
  if (expecting_sigchld)
    {
      printf ("no SIGCHLD seen for SIGCONT (optional)\n");
      expecting_sigchld = 0;
    }
  else
    CHECK_SIGCHLD ("continued", CLD_CONTINUED, SIGCONT);

  info.si_signo = 0;		/* A successful call sets it to SIGCHLD.  */
  info.si_pid = -1;
  info.si_status = -1;
  fail = waitid (P_PID, pid, &info, WCONTINUED|WNOWAIT);
  switch (fail)
    {
    default:
      printf ("waitid WCONTINUED|WNOWAIT returned bogus value %d\n", fail);
      RETURN (EXIT_FAILURE);
    case -1:
      printf ("waitid WCONTINUED|WNOWAIT on continued: %m\n");
      RETURN (errno == ENOTSUP ? EXIT_SUCCESS : EXIT_FAILURE);
    case 0:
      if (info.si_signo != SIGCHLD)
	{
	  printf ("waitid WCONTINUED|WNOWAIT on continued signal %d\n",
		  info.si_signo);
	  RETURN (EXIT_FAILURE);
	}
      if (info.si_code != CLD_CONTINUED)
	{
	  printf ("waitid WCONTINUED|WNOWAIT on continued code %d\n",
		  info.si_code);
	  RETURN (EXIT_FAILURE);
	}
      if (info.si_status != SIGCONT)
	{
	  printf ("waitid WCONTINUED|WNOWAIT on continued status %d\n",
		  info.si_status);
	  RETURN (EXIT_FAILURE);
	}
      if (info.si_pid != pid)
	{
	  printf ("waitid WCONTINUED|WNOWAIT on continued pid %d != %d\n",
		  info.si_pid, pid);
	  RETURN (EXIT_FAILURE);
	}
    }

  /* That should leave the CLD_CONTINUED state waiting to be seen again.  */
  info.si_signo = 0;		/* A successful call sets it to SIGCHLD.  */
  info.si_pid = -1;
  info.si_status = -1;
  fail = waitid (P_PID, pid, &info, WCONTINUED);
  switch (fail)
    {
    default:
      printf ("waitid WCONTINUED returned bogus value %d\n", fail);
      RETURN (EXIT_FAILURE);
    case -1:
      printf ("waitid WCONTINUED on continued: %m\n");
      RETURN (errno == ENOTSUP ? EXIT_SUCCESS : EXIT_FAILURE);
    case 0:
      if (info.si_signo != SIGCHLD)
	{
	  printf ("waitid WCONTINUED on continued signal %d\n", info.si_signo);
	  RETURN (EXIT_FAILURE);
	}
      if (info.si_code != CLD_CONTINUED)
	{
	  printf ("waitid WCONTINUED on continued code %d\n", info.si_code);
	  RETURN (EXIT_FAILURE);
	}
      if (info.si_status != SIGCONT)
	{
	  printf ("waitid WCONTINUED on continued status %d\n",
		  info.si_status);
	  RETURN (EXIT_FAILURE);
	}
      if (info.si_pid != pid)
	{
	  printf ("waitid WCONTINUED on continued pid %d != %d\n",
		  info.si_pid, pid);
	  RETURN (EXIT_FAILURE);
	}
    }

  /* Now try a wait that should not succeed.  */
  info.si_signo = 0;		/* A successful call sets it to SIGCHLD.  */
  fail = waitid (P_PID, pid, &info, WCONTINUED|WNOHANG);
  switch (fail)
    {
    default:
      printf ("waitid returned bogus value %d\n", fail);
      RETURN (EXIT_FAILURE);
    case -1:
      printf ("waitid WCONTINUED|WNOHANG on waited continued: %m\n");
      RETURN (errno == ENOTSUP ? EXIT_SUCCESS : EXIT_FAILURE);
    case 0:
      if (info.si_signo == 0)
	break;
      if (info.si_signo == SIGCHLD)
	printf ("waitid WCONTINUED|WNOHANG on waited continued status %d\n",
		info.si_status);
      else
	printf ("waitid WCONTINUED|WNOHANG on waited continued signal %d\n",
		info.si_signo);
      RETURN (EXIT_FAILURE);
    }

  /* Now stop him again and test waitpid with WCONTINUED.  */
  expecting_sigchld = 1;
  if (kill (pid, SIGSTOP) != 0)
    {
      printf ("kill (%d, SIGSTOP): %m\n", pid);
      RETURN (EXIT_FAILURE);
    }
  pid_t wpid = waitpid (pid, &fail, WUNTRACED);
  if (wpid < 0)
    {
      printf ("waitpid WUNTRACED on stopped: %m\n");
      RETURN (EXIT_FAILURE);
    }
  else if (wpid != pid)
    {
      printf ("waitpid WUNTRACED on stopped returned %d != %d (status %x)\n",
	      wpid, pid, fail);
      RETURN (EXIT_FAILURE);
    }
  else if (!WIFSTOPPED (fail) || WIFSIGNALED (fail) || WIFEXITED (fail)
	   || WIFCONTINUED (fail) || WSTOPSIG (fail) != SIGSTOP)
    {
      printf ("waitpid WUNTRACED on stopped: status %x\n", fail);
      RETURN (EXIT_FAILURE);
    }
  CHECK_SIGCHLD ("stopped", CLD_STOPPED, SIGSTOP);

  expecting_sigchld = 1;
  if (kill (pid, SIGCONT) != 0)
    {
      printf ("kill (%d, SIGCONT): %m\n", pid);
      RETURN (EXIT_FAILURE);
    }

  /* Wait for the child to have continued.  */
  sleep (2);

  if (expecting_sigchld)
    {
      printf ("no SIGCHLD seen for SIGCONT (optional)\n");
      expecting_sigchld = 0;
    }
  else
    CHECK_SIGCHLD ("continued", CLD_CONTINUED, SIGCONT);

  wpid = waitpid (pid, &fail, WCONTINUED);
  if (wpid < 0)
    {
      if (errno == EINVAL)
	printf ("waitpid does not support WCONTINUED\n");
      else
	{
	  printf ("waitpid WCONTINUED on continued: %m\n");
	  RETURN (EXIT_FAILURE);
	}
    }
  else if (wpid != pid)
    {
      printf ("\
waitpid WCONTINUED on continued returned %d != %d (status %x)\n",
	     wpid, pid, fail);
      RETURN (EXIT_FAILURE);
    }
  else if (WIFSTOPPED (fail) || WIFSIGNALED (fail) || WIFEXITED (fail)
	   || !WIFCONTINUED (fail))
    {
      printf ("waitpid WCONTINUED on continued: status %x\n", fail);
      RETURN (EXIT_FAILURE);
    }
#endif

  expecting_sigchld = 1;

  /* Die, child, die!  */
  if (kill (pid, SIGKILL) != 0)
    {
      printf ("kill (%d, SIGKILL): %m\n", pid);
      RETURN (EXIT_FAILURE);
    }

#ifdef WNOWAIT
  info.si_signo = 0;		/* A successful call sets it to SIGCHLD.  */
  info.si_pid = -1;
  info.si_status = -1;
  fail = waitid (P_PID, pid, &info, WEXITED|WNOWAIT);
  switch (fail)
    {
    default:
      printf ("waitid WNOWAIT returned bogus value %d\n", fail);
      RETURN (EXIT_FAILURE);
    case -1:
      printf ("waitid WNOWAIT on killed: %m\n");
      RETURN (errno == ENOTSUP ? EXIT_SUCCESS : EXIT_FAILURE);
    case 0:
      if (info.si_signo != SIGCHLD)
	{
	  printf ("waitid WNOWAIT on killed signal %d\n", info.si_signo);
	  RETURN (EXIT_FAILURE);
	}
      if (info.si_code != CLD_KILLED)
	{
	  printf ("waitid WNOWAIT on killed code %d\n", info.si_code);
	  RETURN (EXIT_FAILURE);
	}
      if (info.si_status != SIGKILL)
	{
	  printf ("waitid WNOWAIT on killed status %d\n", info.si_status);
	  RETURN (EXIT_FAILURE);
	}
      if (info.si_pid != pid)
	{
	  printf ("waitid WNOWAIT on killed pid %d != %d\n", info.si_pid, pid);
	  RETURN (EXIT_FAILURE);
	}
    }
#else
  /* Allow enough time to be sure the child died; we didn't synchronize.  */
  sleep (2);
#endif

  CHECK_SIGCHLD ("killed", CLD_KILLED, SIGKILL);

  info.si_signo = 0;		/* A successful call sets it to SIGCHLD.  */
  info.si_pid = -1;
  info.si_status = -1;
  fail = waitid (P_PID, pid, &info, WEXITED|WNOHANG);
  switch (fail)
    {
    default:
      printf ("waitid WNOHANG returned bogus value %d\n", fail);
      RETURN (EXIT_FAILURE);
    case -1:
      printf ("waitid WNOHANG on killed: %m\n");
      RETURN (EXIT_FAILURE);
    case 0:
      if (info.si_signo != SIGCHLD)
	{
	  printf ("waitid WNOHANG on killed signal %d\n", info.si_signo);
	  RETURN (EXIT_FAILURE);
	}
      if (info.si_code != CLD_KILLED)
	{
	  printf ("waitid WNOHANG on killed code %d\n", info.si_code);
	  RETURN (EXIT_FAILURE);
	}
      if (info.si_status != SIGKILL)
	{
	  printf ("waitid WNOHANG on killed status %d\n", info.si_status);
	  RETURN (EXIT_FAILURE);
	}
      if (info.si_pid != pid)
	{
	  printf ("waitid WNOHANG on killed pid %d != %d\n", info.si_pid, pid);
	  RETURN (EXIT_FAILURE);
	}
    }

  fail = waitid (P_PID, pid, &info, WEXITED);
  if (fail == -1)
    {
      if (errno != ECHILD)
	{
	  printf ("waitid WEXITED on killed: %m\n");
	  RETURN (EXIT_FAILURE);
	}
    }
  else
    {
      printf ("waitid WEXITED returned bogus value %d\n", fail);
      RETURN (EXIT_FAILURE);
    }

#undef RETURN
 out:
  if (spurious_sigchld)
    status = EXIT_FAILURE;
  signal (SIGCHLD, SIG_IGN);
  kill (pid, SIGKILL);		/* Make sure it's dead if we bailed early.  */
  return status;
}

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