test-skeleton.c

   1 /* Skeleton for test programs.
   2    Copyright (C) 1998,2000-2004, 2005, 2009 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
   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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #include <errno.h>
  22 #include <getopt.h>
  23 #include <malloc.h>
  24 #include <search.h>
  25 #include <signal.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <unistd.h>
  30 #include <sys/resource.h>
  31 #include <sys/wait.h>
  32 #include <sys/param.h>
  33 #include <time.h>
  34
  35 /* The test function is normally called `do_test' and it is called
  36    with argc and argv as the arguments.  We nevertheless provide the
  37    possibility to overwrite this name.  */
  38 #ifndef TEST_FUNCTION
  39 # define TEST_FUNCTION do_test (argc, argv)
  40 #endif
  41
  42 #ifndef TEST_DATA_LIMIT
  43 # define TEST_DATA_LIMIT (64 << 20) /* Data limit (bytes) to run with.  */
  44 #endif
  45
  46 #define OPT_DIRECT 1000
  47 #define OPT_TESTDIR 1001
  48
  49 static struct option options[] =
  50 {
  51 #ifdef CMDLINE_OPTIONS
  52   CMDLINE_OPTIONS
  53 #endif
  54   { "direct", no_argument, NULL, OPT_DIRECT },
  55   { "test-dir", required_argument, NULL, OPT_TESTDIR },
  56   { NULL, 0, NULL, 0 }
  57 };
  58
  59 /* PID of the test itself.  */
  60 static pid_t pid;
  61
  62 /* Directory to place temporary files in.  */
  63 static const char *test_dir;
  64
  65 /* List of temporary files.  */
  66 struct temp_name_list
  67 {
  68   struct qelem q;
  69   const char *name;
  70 } *temp_name_list;
  71
  72 /* Add temporary files in list.  */
  73 static void
  74 __attribute__ ((unused))
  75 add_temp_file (const char *name)
  76 {
  77   struct temp_name_list *newp
  78     = (struct temp_name_list *) calloc (sizeof (*newp), 1);
  79   if (newp != NULL)
  80     {
  81       newp->name = name;
  82       if (temp_name_list == NULL)
  83         temp_name_list = (struct temp_name_list *) &newp->q;
  84       else
  85         insque (newp, temp_name_list);
  86     }
  87 }
  88
  89 /* Delete all temporary files.  */
  90 static void
  91 delete_temp_files (void)
  92 {
  93   while (temp_name_list != NULL)
  94     {
  95       remove (temp_name_list->name);
  96       temp_name_list = (struct temp_name_list *) temp_name_list->q.q_forw;
  97     }
  98 }
  99
 100 /* Create a temporary file.  */
 101 static int
 102 __attribute__ ((unused))
 103 create_temp_file (const char *base, char **filename)
 104 {
 105   char *fname;
 106   int fd;
 107
 108   fname = (char *) malloc (strlen (test_dir) + 1 + strlen (base)
 109                            + sizeof ("XXXXXX"));
 110   if (fname == NULL)
 111     {
 112       puts ("out of memory");
 113       return -1;
 114     }
 115   strcpy (stpcpy (stpcpy (stpcpy (fname, test_dir), "/"), base), "XXXXXX");
 116
 117   fd = mkstemp (fname);
 118   if (fd == -1)
 119     {
 120       printf ("cannot open temporary file '%s': %m\n", fname);
 121       free (fname);
 122       return -1;
 123     }
 124
 125   add_temp_file (fname);
 126   if (filename != NULL)
 127     *filename = fname;
 128
 129   return fd;
 130 }
 131
 132 /* Timeout handler.  We kill the child and exit with an error.  */
 133 static void
 134 __attribute__ ((noreturn))
 135 signal_handler (int sig __attribute__ ((unused)))
 136 {
 137   int killed;
 138   int status;
 139
 140   /* Send signal.  */
 141   kill (pid, SIGKILL);
 142
 143   /* Wait for it to terminate.  */
 144   int i;
 145   for (i = 0; i < 5; ++i)
 146     {
 147       killed = waitpid (pid, &status, WNOHANG|WUNTRACED);
 148       if (killed != 0)
 149         break;
 150
 151       /* Delay, give the system time to process the kill.  If the
 152          nanosleep() call return prematurely, all the better.  We
 153          won't restart it since this probably means the child process
 154          finally died.  */
 155       struct timespec ts;
 156       ts.tv_sec = 0;
 157       ts.tv_nsec = 100000000;
 158       nanosleep (&ts, NULL);
 159     }
 160   if (killed != 0 && killed != pid)
 161     {
 162       perror ("Failed to kill test process");
 163       exit (1);
 164     }
 165
 166 #ifdef CLEANUP_HANDLER
 167   CLEANUP_HANDLER;
 168 #endif
 169
 170   if (sig == SIGINT)
 171     {
 172       signal (sig, SIG_DFL);
 173       raise (sig);
 174     }
 175
 176   /* If we expected this signal: good!  */
 177 #ifdef EXPECTED_SIGNAL
 178   if (EXPECTED_SIGNAL == SIGALRM)
 179     exit (0);
 180 #endif
 181
 182   if (killed == 0 || (WIFSIGNALED (status) && WTERMSIG (status) == SIGKILL))
 183     fputs ("Timed out: killed the child process\n", stderr);
 184   else if (WIFSTOPPED (status))
 185     fprintf (stderr, "Timed out: the child process was %s\n",
 186              strsignal (WSTOPSIG (status)));
 187   else if (WIFSIGNALED (status))
 188     fprintf (stderr, "Timed out: the child process got signal %s\n",
 189              strsignal (WTERMSIG (status)));
 190   else
 191     fprintf (stderr, "Timed out: killed the child process but it exited %d\n",
 192              WEXITSTATUS (status));
 193
 194   /* Exit with an error.  */
 195   exit (1);
 196 }
 197
 198 /* We provide the entry point here.  */
 199 int
 200 main (int argc, char *argv[])
 201 {
 202   int direct = 0;       /* Directly call the test function?  */
 203   int status;
 204   int opt;
 205   unsigned int timeoutfactor = 1;
 206   pid_t termpid;
 207
 208   /* Make uses of freed and uninitialized memory known.  */
 209   mallopt (M_PERTURB, 42);
 210
 211 #ifdef STDOUT_UNBUFFERED
 212   setbuf (stdout, NULL);
 213 #endif
 214
 215   while ((opt = getopt_long (argc, argv, "+", options, NULL)) != -1)
 216     switch (opt)
 217       {
 218       case '?':
 219         exit (1);
 220       case OPT_DIRECT:
 221         direct = 1;
 222         break;
 223       case OPT_TESTDIR:
 224         test_dir = optarg;
 225         break;
 226 #ifdef CMDLINE_PROCESS
 227         CMDLINE_PROCESS
 228 #endif
 229       }
 230
 231   /* If set, read the test TIMEOUTFACTOR value from the environment.
 232      This value is used to scale the default test timeout values. */
 233   char *envstr_timeoutfactor = getenv ("TIMEOUTFACTOR");
 234   if (envstr_timeoutfactor != NULL)
 235     {
 236       char *envstr_conv = envstr_timeoutfactor;
 237       unsigned long int env_fact;
 238
 239       env_fact = strtoul (envstr_timeoutfactor, &envstr_conv, 0);
 240       if (*envstr_conv == '\0' && envstr_conv != envstr_timeoutfactor)
 241         timeoutfactor = MAX (env_fact, 1);
 242     }
 243
 244   /* Set TMPDIR to specified test directory.  */
 245   if (test_dir != NULL)
 246     {
 247       setenv ("TMPDIR", test_dir, 1);
 248
 249       if (chdir (test_dir) < 0)
 250         {
 251           perror ("chdir");
 252           exit (1);
 253         }
 254     }
 255   else
 256     {
 257       test_dir = getenv ("TMPDIR");
 258       if (test_dir == NULL || test_dir[0] == '\0')
 259         test_dir = "/tmp";
 260     }
 261
 262   /* Make sure we see all message, even those on stdout.  */
 263   setvbuf (stdout, NULL, _IONBF, 0);
 264
 265   /* make sure temporary files are deleted.  */
 266   atexit (delete_temp_files);
 267
 268   /* Correct for the possible parameters.  */
 269   argv[optind - 1] = argv[0];
 270   argv += optind - 1;
 271   argc -= optind - 1;
 272
 273   /* Call the initializing function, if one is available.  */
 274 #ifdef PREPARE
 275   PREPARE (argc, argv);
 276 #endif
 277
 278   /* If we are not expected to fork run the function immediately.  */
 279   if (direct)
 280     return TEST_FUNCTION;
 281
 282   /* Set up the test environment:
 283      - prevent core dumps
 284      - set up the timer
 285      - fork and execute the function.  */
 286
 287   pid = fork ();
 288   if (pid == 0)
 289     {
 290       /* This is the child.  */
 291 #ifdef RLIMIT_CORE
 292       /* Try to avoid dumping core.  */
 293       struct rlimit core_limit;
 294       core_limit.rlim_cur = 0;
 295       core_limit.rlim_max = 0;
 296       setrlimit (RLIMIT_CORE, &core_limit);
 297 #endif
 298
 299 #ifdef RLIMIT_DATA
 300       /* Try to avoid eating all memory if a test leaks.  */
 301       struct rlimit data_limit;
 302       if (getrlimit (RLIMIT_DATA, &data_limit) == 0)
 303         {
 304           if (TEST_DATA_LIMIT == RLIM_INFINITY)
 305             data_limit.rlim_cur = data_limit.rlim_max;
 306           else if (data_limit.rlim_cur > (rlim_t) TEST_DATA_LIMIT)
 307             data_limit.rlim_cur = MIN ((rlim_t) TEST_DATA_LIMIT,
 308                                        data_limit.rlim_max);
 309           if (setrlimit (RLIMIT_DATA, &data_limit) < 0)
 310             perror ("setrlimit: RLIMIT_DATA");
 311         }
 312       else
 313         perror ("getrlimit: RLIMIT_DATA");
 314 #endif
 315
 316       /* We put the test process in its own pgrp so that if it bogusly
 317          generates any job control signals, they won't hit the whole build.  */
 318       setpgid (0, 0);
 319
 320       /* Execute the test function and exit with the return value.   */
 321       exit (TEST_FUNCTION);
 322     }
 323   else if (pid < 0)
 324     {
 325       perror ("Cannot fork test program");
 326       exit (1);
 327     }
 328
 329   /* Set timeout.  */
 330 #ifndef TIMEOUT
 331   /* Default timeout is two seconds.  */
 332 # define TIMEOUT 2
 333 #endif
 334   signal (SIGALRM, signal_handler);
 335   alarm (TIMEOUT * timeoutfactor);
 336
 337   /* Make sure we clean up if the wrapper gets interrupted.  */
 338   signal (SIGINT, signal_handler);
 339
 340   /* Wait for the regular termination.  */
 341   termpid = TEMP_FAILURE_RETRY (waitpid (pid, &status, 0));
 342   if (termpid == -1)
 343     {
 344       printf ("Waiting for test program failed: %m\n");
 345       exit (1);
 346     }
 347   if (termpid != pid)
 348     {
 349       printf ("Oops, wrong test program terminated: expected %ld, got %ld\n",
 350               (long int) pid, (long int) termpid);
 351       exit (1);
 352     }
 353
 354 #ifndef EXPECTED_SIGNAL
 355   /* We don't expect any signal.  */
 356 # define EXPECTED_SIGNAL 0
 357 #endif
 358   if (WTERMSIG (status) != EXPECTED_SIGNAL)
 359     {
 360       if (EXPECTED_SIGNAL != 0)
 361         {
 362           if (WTERMSIG (status) == 0)
 363             fprintf (stderr,
 364                      "Expected signal '%s' from child, got none\n",
 365                      strsignal (EXPECTED_SIGNAL));
 366           else
 367             fprintf (stderr,
 368                      "Incorrect signal from child: got `%s', need `%s'\n",
 369                      strsignal (WTERMSIG (status)),
 370                      strsignal (EXPECTED_SIGNAL));
 371         }
 372       else
 373         fprintf (stderr, "Didn't expect signal from child: got `%s'\n",
 374                  strsignal (WTERMSIG (status)));
 375       exit (1);
 376     }
 377
 378   /* Simply exit with the return value of the test.  */
 379 #ifndef EXPECTED_STATUS
 380   return WEXITSTATUS (status);
 381 #else
 382   if (WEXITSTATUS (status) != EXPECTED_STATUS)
 383     {
 384       fprintf (stderr, "Expected status %d, got %d\n",
 385                EXPECTED_STATUS, WEXITSTATUS (status));
 386       exit (1);
 387     }
 388
 389   return 0;
 390 #endif
 391 }