aboutsummaryrefslogtreecommitdiff
path: root/support/support_test_main.c
blob: e3f0bf15f254d6051447f293b370eadbc89ab675 (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
/* Main worker function for the test driver.
   Copyright (C) 1998-2020 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
   <https://www.gnu.org/licenses/>.  */

#include <support/test-driver.h>
#include <support/check.h>
#include <support/temp_file-internal.h>
#include <support/support.h>

#include <assert.h>
#include <errno.h>
#include <getopt.h>
#include <malloc.h>
#include <signal.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
#include <sys/resource.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#include <xstdio.h>

static const struct option default_options[] =
{
  TEST_DEFAULT_OPTIONS
  { NULL, 0, NULL, 0 }
};

/* Show people how to run the program.  */
static void
usage (const struct option *options)
{
  size_t i;

  printf ("Usage: %s [options]\n"
          "\n"
          "Environment Variables:\n"
          "  TIMEOUTFACTOR          An integer used to scale the timeout\n"
          "  TMPDIR                 Where to place temporary files\n"
          "  TEST_COREDUMPS         Do not disable coredumps if set\n"
          "\n",
          program_invocation_short_name);
  printf ("Options:\n");
  for (i = 0; options[i].name; ++i)
    {
      int indent;

      indent = printf ("  --%s", options[i].name);
      if (options[i].has_arg == required_argument)
        indent += printf (" <arg>");
      printf ("%*s", 25 - indent, "");
      switch (options[i].val)
        {
        case 'v':
          printf ("Increase the output verbosity");
          break;
        case OPT_DIRECT:
          printf ("Run the test directly (instead of forking & monitoring)");
          break;
        case OPT_TESTDIR:
          printf ("Override the TMPDIR env var");
          break;
        }
      printf ("\n");
    }
}

/* The PID of the test process.  */
static pid_t test_pid;

/* The cleanup handler passed to test_main.  */
static void (*cleanup_function) (void);

static void
print_timestamp (const char *what, struct timespec tv)
{
  struct tm tm;
  /* Casts of tv.tv_nsec below are necessary because the type of
     tv_nsec is not literally long int on all supported platforms.  */
  if (gmtime_r (&tv.tv_sec, &tm) == NULL)
    printf ("%s: %lld.%09ld\n",
            what, (long long int) tv.tv_sec, (long int) tv.tv_nsec);
  else
    printf ("%s: %04d-%02d-%02dT%02d:%02d:%02d.%09ld\n",
            what, 1900 + tm.tm_year, tm.tm_mon + 1, tm.tm_mday,
            tm.tm_hour, tm.tm_min, tm.tm_sec, (long int) tv.tv_nsec);
}

/* Timeout handler.  We kill the child and exit with an error.  */
static void
__attribute__ ((noreturn))
signal_handler (int sig)
{
  int killed;
  int status;

  /* Do this first to avoid further interference from the
     subprocess.  */
  struct timespec now;
  clock_gettime (CLOCK_REALTIME, &now);
  struct stat64 st;
  bool st_available = fstat64 (STDOUT_FILENO, &st) == 0 && st.st_mtime != 0;

  assert (test_pid > 1);
  /* Kill the whole process group.  */
  kill (-test_pid, SIGKILL);
  /* In case setpgid failed in the child, kill it individually too.  */
  kill (test_pid, SIGKILL);

  /* Wait for it to terminate.  */
  int i;
  for (i = 0; i < 5; ++i)
    {
      killed = waitpid (test_pid, &status, WNOHANG|WUNTRACED);
      if (killed != 0)
        break;

      /* Delay, give the system time to process the kill.  If the
         nanosleep() call return prematurely, all the better.  We
         won't restart it since this probably means the child process
         finally died.  */
      struct timespec ts;
      ts.tv_sec = 0;
      ts.tv_nsec = 100000000;
      nanosleep (&ts, NULL);
    }
  if (killed != 0 && killed != test_pid)
    {
      printf ("Failed to kill test process: %m\n");
      exit (1);
    }

  if (cleanup_function != NULL)
    cleanup_function ();

  if (sig == SIGINT)
    {
      signal (sig, SIG_DFL);
      raise (sig);
    }

  if (killed == 0 || (WIFSIGNALED (status) && WTERMSIG (status) == SIGKILL))
    puts ("Timed out: killed the child process");
  else if (WIFSTOPPED (status))
    printf ("Timed out: the child process was %s\n",
            strsignal (WSTOPSIG (status)));
  else if (WIFSIGNALED (status))
    printf ("Timed out: the child process got signal %s\n",
            strsignal (WTERMSIG (status)));
  else
    printf ("Timed out: killed the child process but it exited %d\n",
            WEXITSTATUS (status));

  print_timestamp ("Termination time", now);
  if (st_available)
    print_timestamp ("Last write to standard output", st.st_mtim);

  /* Exit with an error.  */
  exit (1);
}

/* This must be volatile as it will be modified by the debugger.  */
static volatile int wait_for_debugger = 0;

/* Run test_function or test_function_argv.  */
static int
run_test_function (int argc, char **argv, const struct test_config *config)
{
  const char *wfd = getenv("WAIT_FOR_DEBUGGER");
  if (wfd != NULL)
    wait_for_debugger = atoi (wfd);
  if (wait_for_debugger)
    {
      pid_t mypid;
      FILE *gdb_script;
      char *gdb_script_name;
      int inside_container = 0;

      mypid = getpid();
      if (mypid < 3)
	{
	  const char *outside_pid = getenv("PID_OUTSIDE_CONTAINER");
	  if (outside_pid)
	    {
	      mypid = atoi (outside_pid);
	      inside_container = 1;
	    }
	}

      gdb_script_name = (char *) xmalloc (strlen (argv[0]) + strlen (".gdb") + 1);
      sprintf (gdb_script_name, "%s.gdb", argv[0]);
      gdb_script = xfopen (gdb_script_name, "w");

      fprintf (stderr, "Waiting for debugger, test process is pid %d\n", mypid);
      fprintf (stderr, "gdb -x %s\n", gdb_script_name);
      if (inside_container)
	fprintf (gdb_script, "set sysroot %s/testroot.root\n", support_objdir_root);
      fprintf (gdb_script, "file\n");
      fprintf (gdb_script, "file %s\n", argv[0]);
      fprintf (gdb_script, "symbol-file %s\n", argv[0]);
      fprintf (gdb_script, "exec-file %s\n", argv[0]);
      fprintf (gdb_script, "attach %ld\n", (long int) mypid);
      fprintf (gdb_script, "set wait_for_debugger = 0\n");
      fclose (gdb_script);
    }

  /* Wait for the debugger to set wait_for_debugger to zero.  */
  while (wait_for_debugger)
    usleep (1000);

  if (config->test_function != NULL)
    return config->test_function ();
  else if (config->test_function_argv != NULL)
    return config->test_function_argv (argc, argv);
  else
    {
      printf ("error: no test function defined\n");
      exit (1);
    }
}

static bool test_main_called;

const char *test_dir = NULL;
unsigned int test_verbose = 0;

/* If test failure reporting has been linked in, it may contribute
   additional test failures.  */
static int
adjust_exit_status (int status)
{
  if (support_report_failure != NULL)
    return support_report_failure (status);
  return status;
}

int
support_test_main (int argc, char **argv, const struct test_config *config)
{
  if (test_main_called)
    {
      printf ("error: test_main called for a second time\n");
      exit (1);
    }
  test_main_called = true;
  const struct option *options;
  if (config->options != NULL)
    options = config->options;
  else
    options = default_options;

  cleanup_function = config->cleanup_function;

  int direct = 0;       /* Directly call the test function?  */
  int status;
  int opt;
  unsigned int timeoutfactor = 1;
  pid_t termpid;

  /* If we're debugging the test, we need to disable timeouts and use
     the initial pid (esp if we're running inside a container).  */
  if (getenv("WAIT_FOR_DEBUGGER") != NULL)
    direct = 1;

  if (!config->no_mallopt)
    {
      /* Make uses of freed and uninitialized memory known.  Do not
         pull in a definition for mallopt if it has not been defined
         already.  */
      extern __typeof__ (mallopt) mallopt __attribute__ ((weak));
      if (mallopt != NULL)
        mallopt (M_PERTURB, 42);
    }

  while ((opt = getopt_long (argc, argv, config->optstring, options, NULL))
	 != -1)
    switch (opt)
      {
      case '?':
        usage (options);
        exit (1);
      case 'v':
        ++test_verbose;
        break;
      case OPT_DIRECT:
        direct = 1;
        break;
      case OPT_TESTDIR:
        test_dir = optarg;
        break;
      default:
        if (config->cmdline_function != NULL)
          config->cmdline_function (opt);
      }

  /* If set, read the test TIMEOUTFACTOR value from the environment.
     This value is used to scale the default test timeout values. */
  char *envstr_timeoutfactor = getenv ("TIMEOUTFACTOR");
  if (envstr_timeoutfactor != NULL)
    {
      char *envstr_conv = envstr_timeoutfactor;
      unsigned long int env_fact;

      env_fact = strtoul (envstr_timeoutfactor, &envstr_conv, 0);
      if (*envstr_conv == '\0' && envstr_conv != envstr_timeoutfactor)
        timeoutfactor = MAX (env_fact, 1);
    }

  /* Set TMPDIR to specified test directory.  */
  if (test_dir != NULL)
    {
      setenv ("TMPDIR", test_dir, 1);

      if (chdir (test_dir) < 0)
        {
          printf ("chdir: %m\n");
          exit (1);
        }
    }
  else
    {
      test_dir = getenv ("TMPDIR");
      if (test_dir == NULL || test_dir[0] == '\0')
        test_dir = "/tmp";
    }
  if (support_set_test_dir != NULL)
    support_set_test_dir (test_dir);

  int timeout = config->timeout;
  if (timeout == 0)
    timeout =  DEFAULT_TIMEOUT;

  /* Make sure we see all message, even those on stdout.  */
  if (!config->no_setvbuf)
    setvbuf (stdout, NULL, _IONBF, 0);

  /* Make sure temporary files are deleted.  */
  if (support_delete_temp_files != NULL)
      atexit (support_delete_temp_files);

  /* Correct for the possible parameters.  */
  argv[optind - 1] = argv[0];
  argv += optind - 1;
  argc -= optind - 1;

  /* Call the initializing function, if one is available.  */
  if (config->prepare_function != NULL)
    config->prepare_function (argc, argv);

  const char *envstr_direct = getenv ("TEST_DIRECT");
  if (envstr_direct != NULL)
    {
      FILE *f = fopen (envstr_direct, "w");
      if (f == NULL)
        {
          printf ("cannot open TEST_DIRECT output file '%s': %m\n",
                  envstr_direct);
          exit (1);
        }

      fprintf (f, "timeout=%u\ntimeoutfactor=%u\n",
               config->timeout, timeoutfactor);
      if (config->expected_status != 0)
        fprintf (f, "exit=%u\n", config->expected_status);
      if (config->expected_signal != 0)
        fprintf (f, "signal=%s\n", strsignal (config->expected_signal));

      if (support_print_temp_files != NULL)
        support_print_temp_files (f);

      fclose (f);
      direct = 1;
    }

  bool disable_coredumps;
  {
    const char *coredumps = getenv ("TEST_COREDUMPS");
    disable_coredumps = coredumps == NULL || coredumps[0] == '\0';
  }

  /* If we are not expected to fork run the function immediately.  */
  if (direct)
    return adjust_exit_status (run_test_function (argc, argv, config));

  /* Set up the test environment:
     - prevent core dumps
     - set up the timer
     - fork and execute the function.  */

  test_pid = fork ();
  if (test_pid == 0)
    {
      /* This is the child.  */
      if (disable_coredumps)
        {
          /* Try to avoid dumping core.  This is necessary because we
             run the test from the source tree, and the coredumps
             would end up there (and not in the build tree).  */
          struct rlimit core_limit;
          core_limit.rlim_cur = 0;
          core_limit.rlim_max = 0;
          setrlimit (RLIMIT_CORE, &core_limit);
        }

      /* We put the test process in its own pgrp so that if it bogusly
         generates any job control signals, they won't hit the whole build.  */
      if (setpgid (0, 0) != 0)
        printf ("Failed to set the process group ID: %m\n");

      /* Execute the test function and exit with the return value.   */
      exit (run_test_function (argc, argv, config));
    }
  else if (test_pid < 0)
    {
      printf ("Cannot fork test program: %m\n");
      exit (1);
    }

  /* Set timeout.  */
  signal (SIGALRM, signal_handler);
  alarm (timeout * timeoutfactor);

  /* Make sure we clean up if the wrapper gets interrupted.  */
  signal (SIGINT, signal_handler);

  /* Wait for the regular termination.  */
  termpid = TEMP_FAILURE_RETRY (waitpid (test_pid, &status, 0));
  if (termpid == -1)
    {
      printf ("Waiting for test program failed: %m\n");
      exit (1);
    }
  if (termpid != test_pid)
    {
      printf ("Oops, wrong test program terminated: expected %ld, got %ld\n",
              (long int) test_pid, (long int) termpid);
      exit (1);
    }

  /* Process terminated normaly without timeout etc.  */
  if (WIFEXITED (status))
    {
      if (config->expected_status == 0)
        {
          if (config->expected_signal == 0)
            /* Exit with the return value of the test.  */
            return adjust_exit_status (WEXITSTATUS (status));
          else
            {
              printf ("Expected signal '%s' from child, got none\n",
                      strsignal (config->expected_signal));
              exit (1);
            }
        }
      else
        {
          /* Non-zero exit status is expected */
          if (WEXITSTATUS (status) != config->expected_status)
            {
              printf ("Expected status %d, got %d\n",
                      config->expected_status, WEXITSTATUS (status));
              exit (1);
            }
        }
      return adjust_exit_status (0);
    }
  /* Process was killed by timer or other signal.  */
  else
    {
      if (config->expected_signal == 0)
        {
          printf ("Didn't expect signal from child: got `%s'\n",
                  strsignal (WTERMSIG (status)));
          exit (1);
        }
      else if (WTERMSIG (status) != config->expected_signal)
        {
          printf ("Incorrect signal from child: got `%s', need `%s'\n",
                  strsignal (WTERMSIG (status)),
                  strsignal (config->expected_signal));
          exit (1);
        }

      return adjust_exit_status (0);
    }
}