bt2: add `_Trace.cls` property
[babeltrace.git] / lib / logging.c
1 /*
2 * Copyright 2017-2018 Philippe Proulx <pproulx@efficios.com>
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20 * SOFTWARE.
21 */
22
23 #include <stdlib.h>
24 #include <babeltrace2/logging.h>
25 #include <babeltrace2/version.h>
26
27 #define BT_LOG_TAG "LIB"
28 #include <babeltrace2/lib-logging-internal.h>
29
30 #ifdef BT_DEV_MODE
31 /*
32 * Default log level is FATAL in developer mode because fatal logging is
33 * our way to communicate an unsatisfied precondition and the details.
34 */
35 # define DEFAULT_LOG_LEVEL BT_LOG_FATAL
36 #else
37 /*
38 * In non-developer mode, use NONE by default: we don't to print logging
39 * statements for any executable which links with the library. The
40 * executable should call bt_logging_set_global_level() or the
41 * executable's user should set the BABELTRACE_LOGGING_GLOBAL_LEVEL
42 * environment variable.
43 */
44 # define DEFAULT_LOG_LEVEL BT_LOG_NONE
45 #endif /* BT_DEV_MODE */
46
47 int bt_lib_log_level = DEFAULT_LOG_LEVEL;
48
49 enum bt_logging_level bt_logging_get_minimal_level(void)
50 {
51 return BT_LOG_LEVEL;
52 }
53
54 enum bt_logging_level bt_logging_get_global_level(void)
55 {
56 return bt_lib_log_level;
57 }
58
59 void bt_logging_set_global_level(enum bt_logging_level log_level)
60 {
61 #ifdef BT_DEV_MODE
62 /*
63 * Do not allow the library's log level to fall to NONE when in
64 * developer mode because fatal logging is our way to
65 * communicate an unsatisfied precondition and the details.
66 */
67 if (log_level == BT_LOG_NONE) {
68 log_level = BT_LOG_FATAL;
69 }
70 #endif
71
72 bt_lib_log_level = log_level;
73 }
74
75 static
76 void __attribute__((constructor)) bt_logging_ctor(void)
77 {
78 const char *v_extra = bt_version_get_extra() ? bt_version_get_extra() :
79 "";
80
81 bt_logging_set_global_level(
82 bt_log_get_level_from_env("BABELTRACE_LOGGING_GLOBAL_LEVEL"));
83 BT_LOGI("Babeltrace %d.%d.%d%s library loaded: "
84 "major=%d, minor=%d, patch=%d, extra=\"%s\"",
85 bt_version_get_major(), bt_version_get_minor(),
86 bt_version_get_patch(), v_extra,
87 bt_version_get_major(), bt_version_get_minor(),
88 bt_version_get_patch(), v_extra);
89 }
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