failtest: use a linked list for history, not an array.
[ccan] / ccan / 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 }