lib: add internal BT_LIB_LOG*_APPEND_CAUSE() macros
[babeltrace.git] / src / 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/LOGGING"
28 #include "lib/logging.h"
29
30 /*
31 * This is exported because even though the Python plugin provider is a
32 * different shared object for packaging purposes, it's still considered
33 * part of the library and therefore needs the library's run-time log
34 * level.
35 *
36 * The default log level is NONE: we don't print logging statements for
37 * any executable which links with the library. The executable must call
38 * bt_logging_set_global_level() or the executable's user must set the
39 * `LIBBABELTRACE2_INIT_LOG_LEVEL` environment variable to enable
40 * logging.
41 */
42 int bt_lib_log_level = BT_LOG_NONE;
43
44 enum bt_logging_level bt_logging_get_minimal_level(void)
45 {
46 return BT_MINIMAL_LOG_LEVEL;
47 }
48
49 enum bt_logging_level bt_logging_get_global_level(void)
50 {
51 return bt_lib_log_level;
52 }
53
54 void bt_logging_set_global_level(enum bt_logging_level log_level)
55 {
56 bt_lib_log_level = log_level;
57 }
58
59 static
60 void __attribute__((constructor)) bt_logging_ctor(void)
61 {
62 const char *v_extra = bt_version_get_extra() ? bt_version_get_extra() :
63 "";
64
65 bt_logging_set_global_level(
66 bt_log_get_level_from_env("LIBBABELTRACE2_INIT_LOG_LEVEL"));
67 BT_LOGI("Babeltrace %d.%d.%d%s library loaded: "
68 "major=%d, minor=%d, patch=%d, extra=\"%s\"",
69 bt_version_get_major(), bt_version_get_minor(),
70 bt_version_get_patch(), v_extra,
71 bt_version_get_major(), bt_version_get_minor(),
72 bt_version_get_patch(), v_extra);
73 }
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