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5f0b8437 | 1 | /* Global test failure counter. |
581c785b | 2 | Copyright (C) 2016-2022 Free Software Foundation, Inc. |
5f0b8437 FW |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
5f0b8437 FW |
18 | |
19 | #include <support/check.h> | |
20 | #include <support/support.h> | |
21 | #include <support/test-driver.h> | |
22 | ||
23 | #include <stdbool.h> | |
24 | #include <stdio.h> | |
25 | #include <stdlib.h> | |
26 | #include <sys/mman.h> | |
27 | #include <unistd.h> | |
28 | ||
29 | /* This structure keeps track of test failures. The counter is | |
30 | incremented on each failure. The failed member is set to true if a | |
31 | failure is detected, so that even if the counter wraps around to | |
32 | zero, the failure of a test can be detected. | |
33 | ||
34 | The init constructor function below puts *state on a shared | |
35 | annonymous mapping, so that failure reports from subprocesses | |
36 | propagate to the parent process. */ | |
37 | struct test_failures | |
38 | { | |
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39 | unsigned int counter; |
40 | unsigned int failed; | |
5f0b8437 FW |
41 | }; |
42 | static struct test_failures *state; | |
43 | ||
44 | static __attribute__ ((constructor)) void | |
45 | init (void) | |
46 | { | |
47 | void *ptr = mmap (NULL, sizeof (*state), PROT_READ | PROT_WRITE, | |
48 | MAP_ANONYMOUS | MAP_SHARED, -1, 0); | |
49 | if (ptr == MAP_FAILED) | |
50 | { | |
51 | printf ("error: could not map %zu bytes: %m\n", sizeof (*state)); | |
52 | exit (1); | |
53 | } | |
54 | /* Zero-initialization of the struct is sufficient. */ | |
55 | state = ptr; | |
56 | } | |
57 | ||
58 | void | |
59 | support_record_failure (void) | |
60 | { | |
61 | if (state == NULL) | |
62 | { | |
63 | write_message | |
64 | ("error: support_record_failure called without initialization\n"); | |
65 | _exit (1); | |
66 | } | |
67 | /* Relaxed MO is sufficient because we are only interested in the | |
68 | values themselves, in isolation. */ | |
69 | __atomic_store_n (&state->failed, 1, __ATOMIC_RELEASE); | |
70 | __atomic_add_fetch (&state->counter, 1, __ATOMIC_RELEASE); | |
71 | } | |
72 | ||
73 | int | |
74 | support_report_failure (int status) | |
75 | { | |
76 | if (state == NULL) | |
77 | { | |
78 | write_message | |
79 | ("error: support_report_failure called without initialization\n"); | |
80 | return 1; | |
81 | } | |
82 | ||
83 | /* Relaxed MO is sufficient because acquire test result reporting | |
84 | assumes that exiting from the main thread happens before the | |
85 | error reporting via support_record_failure, which requires some | |
86 | form of external synchronization. */ | |
87 | bool failed = __atomic_load_n (&state->failed, __ATOMIC_RELAXED); | |
88 | if (failed) | |
89 | printf ("error: %u test failures\n", | |
90 | __atomic_load_n (&state->counter, __ATOMIC_RELAXED)); | |
91 | ||
92 | if ((status == 0 || status == EXIT_UNSUPPORTED) && failed) | |
93 | /* If we have a recorded failure, it overrides a non-failure | |
94 | report from the test function. */ | |
95 | status = 1; | |
96 | return status; | |
97 | } | |
98 | ||
99 | void | |
100 | support_record_failure_reset (void) | |
101 | { | |
102 | /* Only used for testing the test framework, with external | |
103 | synchronization, but use release MO for consistency. */ | |
104 | __atomic_store_n (&state->failed, 0, __ATOMIC_RELAXED); | |
105 | __atomic_add_fetch (&state->counter, 0, __ATOMIC_RELAXED); | |
106 | } | |
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107 | |
108 | int | |
109 | support_record_failure_is_failed (void) | |
110 | { | |
111 | /* Relaxed MO is sufficient because we need (blocking) external | |
112 | synchronization for reliable test error reporting anyway. */ | |
113 | return __atomic_load_n (&state->failed, __ATOMIC_RELAXED); | |
114 | } |