lib/tdb2/test/failtest_helper.c

   1 #include "failtest_helper.h"
   2 #include "logging.h"
   3 #include <string.h>
   4 #include <ccan/tap/tap.h>
   5
   6 bool failtest_suppress = false;
   7
   8 /* FIXME: From ccan/str */
   9 static inline bool strends(const char *str, const char *postfix)
  10 {
  11         if (strlen(str) < strlen(postfix))
  12                 return false;
  13
  14         return !strcmp(str + strlen(str) - strlen(postfix), postfix);
  15 }
  16
  17 bool failmatch(const struct failtest_call *call,
  18                const char *file, int line, enum failtest_call_type type)
  19 {
  20         return call->type == type
  21                 && call->line == line
  22                 && ((strcmp(call->file, file) == 0)
  23                     || (strends(call->file, file)
  24                         && (call->file[strlen(call->file) - strlen(file) - 1]
  25                             == '/')));
  26 }
  27
  28 static const struct failtest_call *
  29 find_repeat(const struct tlist_calls *history,
  30             const struct failtest_call *call)
  31 {
  32         const struct failtest_call *i;
  33
  34         tlist_for_each(history, i, list) {
  35                 if (i != call)
  36                         continue;
  37                 if (failmatch(i, call->file, call->line, call->type))
  38                         return i;
  39         }
  40         return NULL;
  41 }
  42
  43 static bool is_nonblocking_lock(const struct failtest_call *call)
  44 {
  45         return call->type == FAILTEST_FCNTL && call->u.fcntl.cmd == F_SETLK;
  46 }
  47
  48 static bool is_unlock(const struct failtest_call *call)
  49 {
  50         return call->type == FAILTEST_FCNTL
  51                 && call->u.fcntl.arg.fl.l_type == F_UNLCK;
  52 }
  53
  54 bool exit_check_log(struct tlist_calls *history)
  55 {
  56         const struct failtest_call *i;
  57
  58         tlist_for_each(history, i, list) {
  59                 if (!i->fail)
  60                         continue;
  61                 /* Failing the /dev/urandom open doesn't count: we fall back. */
  62                 if (failmatch(i, URANDOM_OPEN))
  63                         continue;
  64
  65                 /* Similarly with read fail. */
  66                 if (failmatch(i, URANDOM_READ))
  67                         continue;
  68
  69                 /* Initial allocation of tdb doesn't log. */
  70                 if (failmatch(i, INITIAL_TDB_MALLOC))
  71                         continue;
  72
  73                 /* We don't block "failures" on non-blocking locks. */
  74                 if (is_nonblocking_lock(i))
  75                         continue;
  76
  77                 if (!tap_log_messages)
  78                         diag("We didn't log for %s:%u", i->file, i->line);
  79                 return tap_log_messages != 0;
  80         }
  81         return true;
  82 }
  83
  84 /* Some places we soldier on despite errors: only fail them once. */
  85 enum failtest_result
  86 block_repeat_failures(struct tlist_calls *history)
  87 {
  88         const struct failtest_call *i, *last;
  89
  90         last = tlist_tail(history, struct failtest_call, list);
  91
  92         if (failtest_suppress)
  93                 return FAIL_DONT_FAIL;
  94
  95         if (failmatch(last, INITIAL_TDB_MALLOC)
  96             || failmatch(last, URANDOM_OPEN)
  97             || failmatch(last, URANDOM_READ)) {
  98                 if (find_repeat(history, last))
  99                         return FAIL_DONT_FAIL;
 100                 return FAIL_PROBE;
 101         }
 102
 103         /* Unlock or non-blocking lock is fail-once. */
 104         if (is_unlock(last)) {
 105                 /* Find a previous unlock at this point? */
 106                 i = find_repeat(history, last);
 107                 if (i && is_unlock(i))
 108                         return FAIL_DONT_FAIL;
 109                 return FAIL_PROBE;
 110         } else if (is_nonblocking_lock(last)) {
 111                 /* Find a previous non-blocking lock at this point? */
 112                 i = find_repeat(history, last);
 113                 if (i && is_nonblocking_lock(i))
 114                         return FAIL_DONT_FAIL;
 115                 return FAIL_PROBE;
 116         }
 117
 118         return FAIL_OK;
 119 }