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   1 #include <stdio.h>
   2 #include <string.h>
   3 #include "config.h"
   4
   5 /**
   6  * failtest - unit test helpers for testing malloc and other failures.
   7  *
   8  * The failtest module overrides various standard functions, and forks
   9  * your unit test at those points to test failure paths.  The failing
  10  * child are expected to fail (eg. when malloc fails), but should not
  11  * leak memory or crash.  After including failtest_override.h, you can
  12  * include failtest_restore.h to return to non-failing versions.
  13  *
  14  * The unit test is a normal CCAN tap-style test, except it should
  15  * start by calling failtest_init() and end by calling
  16  * failtest_exit().
  17  *
  18  * You can control what functions fail: see failtest_hook.
  19  *
  20  * Example:
  21  *      #include <stdio.h>
  22  *      #include <stdlib.h>
  23  *      #include <string.h>
  24  *      #include <ccan/tap/tap.h>
  25  *      #include <ccan/failtest/failtest_override.h>
  26  *      #include <ccan/failtest/failtest.h>
  27  *
  28  *      int main(int argc, char *argv[])
  29  *      {
  30  *              char *a, *b;
  31  *
  32  *              failtest_init(argc, argv);
  33  *              plan_tests(3);
  34  *
  35  *              // Simple malloc test.
  36  *              a = malloc(100);
  37  *              if (ok1(a)) {
  38  *                      // Fill the memory.
  39  *                      memset(a, 'x', 100);
  40  *                      b = realloc(a, 200);
  41  *                      if (ok1(b)) {
  42  *                              // Fill the rest of the memory.
  43  *                              memset(b + 100, 'y', 100);
  44  *                              // Check it got a copy of a as expected.
  45  *                              ok1(strspn(b, "x") == 100);
  46  *                              free(b);
  47  *                      } else {
  48  *                              // Easy to miss: free a on realloc failure!
  49  *                              free(a);
  50  *                      }
  51  *              }
  52  *              failtest_exit(exit_status());
  53  *      }
  54  *
  55  * License: LGPL
  56  * Author: Rusty Russell <rusty@rustcorp.com.au>
  57  * Ccanlint:
  58  *      // valgrind seems to mess up rlimit.
  59  *      tests_pass_valgrind test/run-with-fdlimit.c:FAIL
  60  */
  61 int main(int argc, char *argv[])
  62 {
  63         if (argc != 2)
  64                 return 1;
  65
  66         if (strcmp(argv[1], "depends") == 0) {
  67                 printf("ccan/build_assert\n");
  68                 printf("ccan/compiler\n");
  69                 printf("ccan/err\n");
  70                 printf("ccan/hash\n");
  71                 printf("ccan/htable\n");
  72                 printf("ccan/read_write_all\n");
  73                 printf("ccan/str\n");
  74                 printf("ccan/time\n");
  75                 printf("ccan/tlist\n");
  76                 return 0;
  77         }
  78
  79         return 1;
  80 }