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
  31 /* The test function is normally called `do_test' and it is called
  32    with argc and argv as the arguments.  We nevertheless provide the
  33    possibility to overwrite this name.  */
  34 #ifndef TEST_FUNCTION
  35 # define TEST_FUNCTION do_test (argc, argv)
  36 #endif
  37
  38
  39 #define OPT_DIRECT 1000
  40 #define OPT_TESTDIR 1001
  41
  42 static struct option options[] =
  43 {
  44 #ifdef CMDLINE_OPTIONS
  45   CMDLINE_OPTIONS
  46 #endif
  47   { "direct", no_argument, NULL, OPT_DIRECT },
  48   { "test-dir", required_argument, NULL, OPT_TESTDIR },
  49   { NULL, 0, NULL, 0 }
  50 };
  51
  52 /* PID of the test itself.  */
  53 static int pid;
  54
  55 /* Directory to place temporary files in.  */
  56 static const char *test_dir;
  57
  58 /* List of temporary files.  */
  59 struct temp_name_list
  60 {
  61   struct qelem q;
  62   const char *name;
  63 } *temp_name_list;
  64
  65 /* Add temporary files in list.  */
  66 static void
  67 __attribute__ ((unused))
  68 add_temp_file (const char *name)
  69 {
  70   struct temp_name_list *newp
  71     = (struct temp_name_list *) calloc (sizeof (*newp), 1);
  72   if (newp != NULL)
  73     {
  74       newp->name = name;
  75       if (temp_name_list == NULL)
  76         temp_name_list = (struct temp_name_list *) &newp->q;
  77       else
  78         insque (newp, temp_name_list);
  79     }
  80 }
  81
  82 /* Delete all temporary files.  */
  83 static void
  84 delete_temp_files (void)
  85 {
  86   while (temp_name_list != NULL)
  87     {
  88       remove (temp_name_list->name);
  89       temp_name_list = (struct temp_name_list *) temp_name_list->q.q_forw;
  90     }
  91 }
  92
  93 /* Create a temporary file.  */
  94 static int
  95 __attribute__ ((unused))
  96 create_temp_file (const char *base, char **filename)
  97 {
  98   char *fname;
  99   int fd;
 100
 101   fname = (char *) malloc (strlen (test_dir) + 1 + strlen (base)
 102                            + sizeof ("XXXXXX"));
 103   if (fname == NULL)
 104     {
 105       puts ("out of memory");
 106       return -1;
 107     }
 108   strcpy (stpcpy (stpcpy (stpcpy (fname, test_dir), "/"), base), "XXXXXX");
 109
 110   fd = mkstemp (fname);
 111   if (fd == -1)
 112     {
 113       printf ("cannot open temporary file '%s': %m\n", fname);
 114       free (fname);
 115       return -1;
 116     }
 117
 118   add_temp_file (fname);
 119   if (filename != NULL)
 120     *filename = fname;
 121
 122   return fd;
 123 }
 124
 125 /* Timeout handler.  We kill the child and exit with an error.  */
 126 static void
 127 __attribute__ ((noreturn))
 128 timeout_handler (int sig __attribute__ ((unused)))
 129 {
 130   int killed;
 131
 132   /* Send signal.  */
 133   kill (pid, SIGKILL);
 134
 135   /* Wait for it to terminate.  */
 136   killed = waitpid (pid, NULL, WNOHANG);
 137   if (killed != 0 && killed != pid)
 138     {
 139       perror ("Failed to killed test process");
 140       exit (1);
 141     }
 142
 143 #ifdef CLEANUP_HANDLER
 144   CLEANUP_HANDLER;
 145 #endif
 146
 147   fputs ("Timed out: killed the child process\n", stderr);
 148
 149   /* Exit with an error.  */
 150   exit (1);
 151 }
 152
 153 /* We provide the entry point here.  */
 154 int
 155 main (int argc, char *argv[])
 156 {
 157   int direct = 0;       /* Directly call the test function?  */
 158   int status;
 159   int opt;
 160
 161 #ifdef STDOUT_UNBUFFERED
 162   setbuf (stdout, NULL);
 163 #endif
 164
 165   while ((opt = getopt_long (argc, argv, "", options, NULL)) != -1)
 166     switch (opt)
 167       {
 168       case '?':
 169         exit (1);
 170       case OPT_DIRECT:
 171         direct = 1;
 172         break;
 173       case OPT_TESTDIR:
 174         test_dir = optarg;
 175         break;
 176 #ifdef CMDLINE_PROCESS
 177         CMDLINE_PROCESS
 178 #endif
 179       }
 180
 181   /* Set TMPDIR to specified test directory.  */
 182   if (test_dir != NULL)
 183     {
 184       setenv ("TMPDIR", test_dir, 1);
 185
 186       if (chdir (test_dir) < 0)
 187         {
 188           perror ("chdir");
 189           exit (1);
 190         }
 191     }
 192   else
 193     {
 194       test_dir = getenv ("TMPDIR");
 195       if (test_dir == NULL || test_dir[0] == '\0')
 196         test_dir = "/tmp";
 197     }
 198
 199   /* Make sure we see all message, even those on stdout.  */
 200   setvbuf (stdout, NULL, _IONBF, 0);
 201
 202   /* make sure temporary files are deleted.  */
 203   atexit (delete_temp_files);
 204
 205   /* Correct for the possible parameters.  */
 206   argv += optind - 1;
 207   argc -= optind - 1;
 208
 209   /* Call the initializing function, if one is available.  */
 210 #ifdef PREPARE
 211   PREPARE (argc, argv);
 212 #endif
 213
 214   /* If we are not expected to fork run the function immediately.  */
 215   if (direct)
 216     return TEST_FUNCTION;
 217
 218   /* Set up the test environment:
 219      - prevent core dumps
 220      - set up the timer
 221      - fork and execute the function.  */
 222
 223   pid = fork ();
 224   if (pid == 0)
 225     {
 226       /* This is the child.  */
 227 #ifdef RLIMIT_CORE
 228       /* Try to avoid dumping core.  */
 229       struct rlimit core_limit;
 230       core_limit.rlim_cur = 0;
 231       core_limit.rlim_max = 0;
 232       setrlimit (RLIMIT_CORE, &core_limit);
 233 #endif
 234
 235       /* Execute the test function and exit with the return value.   */
 236       exit (TEST_FUNCTION);
 237     }
 238   else if (pid < 0)
 239     {
 240       perror ("Cannot fork test program");
 241       exit (1);
 242     }
 243
 244   /* Set timeout.  */
 245 #ifndef TIMEOUT
 246   /* Default timeout is two seconds.  */
 247 # define TIMEOUT 2
 248 #endif
 249   alarm (TIMEOUT);
 250   signal (SIGALRM, timeout_handler);
 251
 252   /* Wait for the regular termination.  */
 253   if (waitpid (pid, &status, 0) != pid)
 254     {
 255       perror ("Oops, wrong test program terminated");
 256       exit (1);
 257     }
 258
 259 #ifndef EXPECTED_SIGNAL
 260   /* We don't expect any signal.  */
 261 # define EXPECTED_SIGNAL 0
 262 #endif
 263   if (WTERMSIG (status) != EXPECTED_SIGNAL)
 264     {
 265       if (EXPECTED_SIGNAL != 0)
 266         fprintf (stderr, "Incorrect signal from child: got `%s', need `%s'\n",
 267                  strsignal (WTERMSIG (status)), strsignal (EXPECTED_SIGNAL));
 268       else
 269         fprintf (stderr, "Didn't expect signal from child: got `%s'\n",
 270                  strsignal (WTERMSIG (status)));
 271       exit (1);
 272     }
 273
 274   /* Simply exit with the return value of the test.  */
 275   return WEXITSTATUS (status);
 276 }