test-skeleton.c

   1 /* Skeleton for test programs.
   2    Copyright (C) 1998, 2000, 2001, 2002 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 <getopt.h>
  22 #include <search.h>
  23 #include <signal.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <unistd.h>
  28 #include <sys/resource.h>
  29 #include <sys/wait.h>
  30 #include <sys/param.h>
  31
  32 /* The test function is normally called `do_test' and it is called
  33    with argc and argv as the arguments.  We nevertheless provide the
  34    possibility to overwrite this name.  */
  35 #ifndef TEST_FUNCTION
  36 # define TEST_FUNCTION do_test (argc, argv)
  37 #endif
  38
  39 #ifndef TEST_DATA_LIMIT
  40 # define TEST_DATA_LIMIT (64 << 20) /* Data limit (bytes) to run with.  */
  41 #endif
  42
  43 #define OPT_DIRECT 1000
  44 #define OPT_TESTDIR 1001
  45
  46 static struct option options[] =
  47 {
  48 #ifdef CMDLINE_OPTIONS
  49   CMDLINE_OPTIONS
  50 #endif
  51   { "direct", no_argument, NULL, OPT_DIRECT },
  52   { "test-dir", required_argument, NULL, OPT_TESTDIR },
  53   { NULL, 0, NULL, 0 }
  54 };
  55
  56 /* PID of the test itself.  */
  57 static pid_t pid;
  58
  59 /* Directory to place temporary files in.  */
  60 static const char *test_dir;
  61
  62 /* List of temporary files.  */
  63 struct temp_name_list
  64 {
  65   struct qelem q;
  66   const char *name;
  67 } *temp_name_list;
  68
  69 /* Add temporary files in list.  */
  70 static void
  71 __attribute__ ((unused))
  72 add_temp_file (const char *name)
  73 {
  74   struct temp_name_list *newp
  75     = (struct temp_name_list *) calloc (sizeof (*newp), 1);
  76   if (newp != NULL)
  77     {
  78       newp->name = name;
  79       if (temp_name_list == NULL)
  80         temp_name_list = (struct temp_name_list *) &newp->q;
  81       else
  82         insque (newp, temp_name_list);
  83     }
  84 }
  85
  86 /* Delete all temporary files.  */
  87 static void
  88 delete_temp_files (void)
  89 {
  90   while (temp_name_list != NULL)
  91     {
  92       remove (temp_name_list->name);
  93       temp_name_list = (struct temp_name_list *) temp_name_list->q.q_forw;
  94     }
  95 }
  96
  97 /* Create a temporary file.  */
  98 static int
  99 __attribute__ ((unused))
 100 create_temp_file (const char *base, char **filename)
 101 {
 102   char *fname;
 103   int fd;
 104
 105   fname = (char *) malloc (strlen (test_dir) + 1 + strlen (base)
 106                            + sizeof ("XXXXXX"));
 107   if (fname == NULL)
 108     {
 109       puts ("out of memory");
 110       return -1;
 111     }
 112   strcpy (stpcpy (stpcpy (stpcpy (fname, test_dir), "/"), base), "XXXXXX");
 113
 114   fd = mkstemp (fname);
 115   if (fd == -1)
 116     {
 117       printf ("cannot open temporary file '%s': %m\n", fname);
 118       free (fname);
 119       return -1;
 120     }
 121
 122   add_temp_file (fname);
 123   if (filename != NULL)
 124     *filename = fname;
 125
 126   return fd;
 127 }
 128
 129 /* Timeout handler.  We kill the child and exit with an error.  */
 130 static void
 131 __attribute__ ((noreturn))
 132 timeout_handler (int sig __attribute__ ((unused)))
 133 {
 134   int killed;
 135   int status;
 136
 137   /* Send signal.  */
 138   kill (pid, SIGKILL);
 139
 140   /* Wait for it to terminate.  */
 141   killed = waitpid (pid, &status, WNOHANG|WUNTRACED);
 142   if (killed != 0 && killed != pid)
 143     {
 144       perror ("Failed to killed test process");
 145       exit (1);
 146     }
 147
 148 #ifdef CLEANUP_HANDLER
 149   CLEANUP_HANDLER;
 150 #endif
 151
 152   /* If we expected this signal: good!  */
 153 #ifdef EXPECTED_SIGNAL
 154   if (EXPECTED_SIGNAL == SIGALRM)
 155     exit (0);
 156 #endif
 157
 158   if (WIFSIGNALED (status) && WTERMSIG (status) == SIGKILL)
 159     fputs ("Timed out: killed the child process\n", stderr);
 160   else if (WIFSTOPPED (status))
 161     fprintf (stderr, "Timed out: the child process was %s\n",
 162              strsignal (WSTOPSIG (status)));
 163   else if (WIFSIGNALED (status))
 164     fprintf (stderr, "Timed out: the child process got signal %s\n",
 165              strsignal (WTERMSIG (status)));
 166   else
 167     fprintf (stderr, "Timed out: killed the child process but it exited %d\n",
 168              WEXITSTATUS (status));
 169
 170   /* Exit with an error.  */
 171   exit (1);
 172 }
 173
 174 /* We provide the entry point here.  */
 175 int
 176 main (int argc, char *argv[])
 177 {
 178   int direct = 0;       /* Directly call the test function?  */
 179   int status;
 180   int opt;
 181   pid_t termpid;
 182
 183 #ifdef STDOUT_UNBUFFERED
 184   setbuf (stdout, NULL);
 185 #endif
 186
 187   while ((opt = getopt_long (argc, argv, "", options, NULL)) != -1)
 188     switch (opt)
 189       {
 190       case '?':
 191         exit (1);
 192       case OPT_DIRECT:
 193         direct = 1;
 194         break;
 195       case OPT_TESTDIR:
 196         test_dir = optarg;
 197         break;
 198 #ifdef CMDLINE_PROCESS
 199         CMDLINE_PROCESS
 200 #endif
 201       }
 202
 203   /* Set TMPDIR to specified test directory.  */
 204   if (test_dir != NULL)
 205     {
 206       setenv ("TMPDIR", test_dir, 1);
 207
 208       if (chdir (test_dir) < 0)
 209         {
 210           perror ("chdir");
 211           exit (1);
 212         }
 213     }
 214   else
 215     {
 216       test_dir = getenv ("TMPDIR");
 217       if (test_dir == NULL || test_dir[0] == '\0')
 218         test_dir = "/tmp";
 219     }
 220
 221   /* Make sure we see all message, even those on stdout.  */
 222   setvbuf (stdout, NULL, _IONBF, 0);
 223
 224   /* make sure temporary files are deleted.  */
 225   atexit (delete_temp_files);
 226
 227   /* Correct for the possible parameters.  */
 228   argv[optind - 1] = argv[0];
 229   argv += optind - 1;
 230   argc -= optind - 1;
 231
 232   /* Call the initializing function, if one is available.  */
 233 #ifdef PREPARE
 234   PREPARE (argc, argv);
 235 #endif
 236
 237   /* If we are not expected to fork run the function immediately.  */
 238   if (direct)
 239     return TEST_FUNCTION;
 240
 241   /* Set up the test environment:
 242      - prevent core dumps
 243      - set up the timer
 244      - fork and execute the function.  */
 245
 246   pid = fork ();
 247   if (pid == 0)
 248     {
 249       /* This is the child.  */
 250 #ifdef RLIMIT_CORE
 251       /* Try to avoid dumping core.  */
 252       struct rlimit core_limit;
 253       core_limit.rlim_cur = 0;
 254       core_limit.rlim_max = 0;
 255       setrlimit (RLIMIT_CORE, &core_limit);
 256 #endif
 257
 258 #ifdef RLIMIT_DATA
 259       /* Try to avoid eating all memory if a test leaks.  */
 260       struct rlimit data_limit;
 261       if (getrlimit (RLIMIT_DATA, &data_limit) == 0)
 262         {
 263           if (TEST_DATA_LIMIT == RLIM_INFINITY)
 264             data_limit.rlim_cur = data_limit.rlim_max;
 265           else if (data_limit.rlim_cur > (rlim_t) TEST_DATA_LIMIT)
 266             data_limit.rlim_cur = MIN ((rlim_t) TEST_DATA_LIMIT,
 267                                        data_limit.rlim_max);
 268           if (setrlimit (RLIMIT_DATA, &data_limit) < 0)
 269             perror ("setrlimit: RLIMIT_DATA");
 270         }
 271       else
 272         perror ("getrlimit: RLIMIT_DATA");
 273 #endif
 274
 275       /* We put the test process in its own pgrp so that if it bogusly
 276          generates any job control signals, they won't hit the whole build.  */
 277       setpgid (0, 0);
 278
 279       /* Execute the test function and exit with the return value.   */
 280       exit (TEST_FUNCTION);
 281     }
 282   else if (pid < 0)
 283     {
 284       perror ("Cannot fork test program");
 285       exit (1);
 286     }
 287
 288   /* Set timeout.  */
 289 #ifndef TIMEOUT
 290   /* Default timeout is two seconds.  */
 291 # define TIMEOUT 2
 292 #endif
 293   alarm (TIMEOUT);
 294   signal (SIGALRM, timeout_handler);
 295
 296   /* Wait for the regular termination.  */
 297   termpid = waitpid (pid, &status, 0);
 298   if (termpid == -1)
 299     {
 300       printf ("Waiting for test program failed: %m\n");
 301       exit (1);
 302     }
 303   if (termpid != pid)
 304     {
 305       printf ("Oops, wrong test program terminated: expected %ld, got %ld\n",
 306               (long int) pid, (long int) termpid);
 307       exit (1);
 308     }
 309
 310 #ifndef EXPECTED_SIGNAL
 311   /* We don't expect any signal.  */
 312 # define EXPECTED_SIGNAL 0
 313 #endif
 314   if (WTERMSIG (status) != EXPECTED_SIGNAL)
 315     {
 316       if (EXPECTED_SIGNAL != 0)
 317         {
 318           if (WTERMSIG (status) == 0)
 319             fprintf (stderr,
 320                      "Expected signal '%s' from child, got none\n",
 321                      strsignal (EXPECTED_SIGNAL));
 322           else
 323             fprintf (stderr,
 324                      "Incorrect signal from child: got `%s', need `%s'\n",
 325                      strsignal (WTERMSIG (status)),
 326                      strsignal (EXPECTED_SIGNAL));
 327         }
 328       else
 329         fprintf (stderr, "Didn't expect signal from child: got `%s'\n",
 330                  strsignal (WTERMSIG (status)));
 331       exit (1);
 332     }
 333
 334   /* Simply exit with the return value of the test.  */
 335   return WEXITSTATUS (status);
 336 }