test-skeleton.c

   1 /* Skeleton for test programs.
   2    Copyright (C) 1998,2000-2004, 2005 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 timeout_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 = { .tv_sec = 0, .tv_nsec = 100000000 };
 156       nanosleep (&ts, NULL);
 157     }
 158   if (killed != 0 && killed != pid)
 159     {
 160       perror ("Failed to kill test process");
 161       exit (1);
 162     }
 163
 164 #ifdef CLEANUP_HANDLER
 165   CLEANUP_HANDLER;
 166 #endif
 167
 168   /* If we expected this signal: good!  */
 169 #ifdef EXPECTED_SIGNAL
 170   if (EXPECTED_SIGNAL == SIGALRM)
 171     exit (0);
 172 #endif
 173
 174   if (killed == 0 || (WIFSIGNALED (status) && WTERMSIG (status) == SIGKILL))
 175     fputs ("Timed out: killed the child process\n", stderr);
 176   else if (WIFSTOPPED (status))
 177     fprintf (stderr, "Timed out: the child process was %s\n",
 178              strsignal (WSTOPSIG (status)));
 179   else if (WIFSIGNALED (status))
 180     fprintf (stderr, "Timed out: the child process got signal %s\n",
 181              strsignal (WTERMSIG (status)));
 182   else
 183     fprintf (stderr, "Timed out: killed the child process but it exited %d\n",
 184              WEXITSTATUS (status));
 185
 186   /* Exit with an error.  */
 187   exit (1);
 188 }
 189
 190 /* We provide the entry point here.  */
 191 int
 192 main (int argc, char *argv[])
 193 {
 194   int direct = 0;       /* Directly call the test function?  */
 195   int status;
 196   int opt;
 197   unsigned int timeoutfactor = 1;
 198   pid_t termpid;
 199
 200   /* Make uses of freed and uninitialized memory known.  */
 201   mallopt (M_PERTURB, 42);
 202
 203 #ifdef STDOUT_UNBUFFERED
 204   setbuf (stdout, NULL);
 205 #endif
 206
 207   while ((opt = getopt_long (argc, argv, "+", options, NULL)) != -1)
 208     switch (opt)
 209       {
 210       case '?':
 211         exit (1);
 212       case OPT_DIRECT:
 213         direct = 1;
 214         break;
 215       case OPT_TESTDIR:
 216         test_dir = optarg;
 217         break;
 218 #ifdef CMDLINE_PROCESS
 219         CMDLINE_PROCESS
 220 #endif
 221       }
 222
 223   /* If set, read the test TIMEOUTFACTOR value from the environment.
 224      This value is used to scale the default test timeout values. */
 225   char *envstr_timeoutfactor = getenv ("TIMEOUTFACTOR");
 226   if (envstr_timeoutfactor != NULL)
 227     {
 228       char *envstr_conv = envstr_timeoutfactor;
 229       unsigned long int env_fact;
 230
 231       env_fact = strtoul (envstr_timeoutfactor, &envstr_conv, 0);
 232       if (*envstr_conv == '\0' && envstr_conv != envstr_timeoutfactor)
 233         timeoutfactor = MAX (env_fact, 1);
 234     }
 235
 236   /* Set TMPDIR to specified test directory.  */
 237   if (test_dir != NULL)
 238     {
 239       setenv ("TMPDIR", test_dir, 1);
 240
 241       if (chdir (test_dir) < 0)
 242         {
 243           perror ("chdir");
 244           exit (1);
 245         }
 246     }
 247   else
 248     {
 249       test_dir = getenv ("TMPDIR");
 250       if (test_dir == NULL || test_dir[0] == '\0')
 251         test_dir = "/tmp";
 252     }
 253
 254   /* Make sure we see all message, even those on stdout.  */
 255   setvbuf (stdout, NULL, _IONBF, 0);
 256
 257   /* make sure temporary files are deleted.  */
 258   atexit (delete_temp_files);
 259
 260   /* Correct for the possible parameters.  */
 261   argv[optind - 1] = argv[0];
 262   argv += optind - 1;
 263   argc -= optind - 1;
 264
 265   /* Call the initializing function, if one is available.  */
 266 #ifdef PREPARE
 267   PREPARE (argc, argv);
 268 #endif
 269
 270   /* If we are not expected to fork run the function immediately.  */
 271   if (direct)
 272     return TEST_FUNCTION;
 273
 274   /* Set up the test environment:
 275      - prevent core dumps
 276      - set up the timer
 277      - fork and execute the function.  */
 278
 279   pid = fork ();
 280   if (pid == 0)
 281     {
 282       /* This is the child.  */
 283 #ifdef RLIMIT_CORE
 284       /* Try to avoid dumping core.  */
 285       struct rlimit core_limit;
 286       core_limit.rlim_cur = 0;
 287       core_limit.rlim_max = 0;
 288       setrlimit (RLIMIT_CORE, &core_limit);
 289 #endif
 290
 291 #ifdef RLIMIT_DATA
 292       /* Try to avoid eating all memory if a test leaks.  */
 293       struct rlimit data_limit;
 294       if (getrlimit (RLIMIT_DATA, &data_limit) == 0)
 295         {
 296           if (TEST_DATA_LIMIT == RLIM_INFINITY)
 297             data_limit.rlim_cur = data_limit.rlim_max;
 298           else if (data_limit.rlim_cur > (rlim_t) TEST_DATA_LIMIT)
 299             data_limit.rlim_cur = MIN ((rlim_t) TEST_DATA_LIMIT,
 300                                        data_limit.rlim_max);
 301           if (setrlimit (RLIMIT_DATA, &data_limit) < 0)
 302             perror ("setrlimit: RLIMIT_DATA");
 303         }
 304       else
 305         perror ("getrlimit: RLIMIT_DATA");
 306 #endif
 307
 308       /* We put the test process in its own pgrp so that if it bogusly
 309          generates any job control signals, they won't hit the whole build.  */
 310       setpgid (0, 0);
 311
 312       /* Execute the test function and exit with the return value.   */
 313       exit (TEST_FUNCTION);
 314     }
 315   else if (pid < 0)
 316     {
 317       perror ("Cannot fork test program");
 318       exit (1);
 319     }
 320
 321   /* Set timeout.  */
 322 #ifndef TIMEOUT
 323   /* Default timeout is two seconds.  */
 324 # define TIMEOUT 2
 325 #endif
 326   signal (SIGALRM, timeout_handler);
 327   alarm (TIMEOUT * timeoutfactor);
 328
 329   /* Wait for the regular termination.  */
 330   termpid = TEMP_FAILURE_RETRY (waitpid (pid, &status, 0));
 331   if (termpid == -1)
 332     {
 333       printf ("Waiting for test program failed: %m\n");
 334       exit (1);
 335     }
 336   if (termpid != pid)
 337     {
 338       printf ("Oops, wrong test program terminated: expected %ld, got %ld\n",
 339               (long int) pid, (long int) termpid);
 340       exit (1);
 341     }
 342
 343 #ifndef EXPECTED_SIGNAL
 344   /* We don't expect any signal.  */
 345 # define EXPECTED_SIGNAL 0
 346 #endif
 347   if (WTERMSIG (status) != EXPECTED_SIGNAL)
 348     {
 349       if (EXPECTED_SIGNAL != 0)
 350         {
 351           if (WTERMSIG (status) == 0)
 352             fprintf (stderr,
 353                      "Expected signal '%s' from child, got none\n",
 354                      strsignal (EXPECTED_SIGNAL));
 355           else
 356             fprintf (stderr,
 357                      "Incorrect signal from child: got `%s', need `%s'\n",
 358                      strsignal (WTERMSIG (status)),
 359                      strsignal (EXPECTED_SIGNAL));
 360         }
 361       else
 362         fprintf (stderr, "Didn't expect signal from child: got `%s'\n",
 363                  strsignal (WTERMSIG (status)));
 364       exit (1);
 365     }
 366
 367   /* Simply exit with the return value of the test.  */
 368 #ifndef EXPECTED_STATUS
 369   return WEXITSTATUS (status);
 370 #else
 371   if (WEXITSTATUS (status) != EXPECTED_STATUS)
 372     {
 373       fprintf (stderr, "Expected status %d, got %d\n",
 374                EXPECTED_STATUS, WEXITSTATUS (status));
 375       exit (1);
 376     }
 377
 378   return 0;
 379 #endif
 380 }