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[babeltrace.git] / src / lib / logging.c
1 /*
2 * SPDX-License-Identifier: MIT
3 *
4 * Copyright 2017-2018 Philippe Proulx <pproulx@efficios.com>
5 */
6
7 #include <stdlib.h>
8 #include <babeltrace2/babeltrace.h>
9
10 #define BT_LOG_TAG "LIB/LOGGING"
11 #include "lib/logging.h"
12
13 /*
14 * This is exported because even though the Python plugin provider is a
15 * different shared object for packaging purposes, it's still considered
16 * part of the library and therefore needs the library's run-time log
17 * level.
18 *
19 * The default log level is NONE: we don't print logging statements for
20 * any executable which links with the library. The executable must call
21 * bt_logging_set_global_level() or the executable's user must set the
22 * `LIBBABELTRACE2_INIT_LOG_LEVEL` environment variable to enable
23 * logging.
24 */
25 BT_EXPORT
26 int bt_lib_log_level = BT_LOG_NONE;
27
28 BT_EXPORT
29 enum bt_logging_level bt_logging_get_minimal_level(void)
30 {
31 return BT_MINIMAL_LOG_LEVEL;
32 }
33
34 BT_EXPORT
35 enum bt_logging_level bt_logging_get_global_level(void)
36 {
37 return bt_lib_log_level;
38 }
39
40 BT_EXPORT
41 void bt_logging_set_global_level(enum bt_logging_level log_level)
42 {
43 bt_lib_log_level = log_level;
44 }
45
46 static
47 void __attribute__((constructor)) bt_logging_ctor(void)
48 {
49 const char *v_extra = bt_version_get_development_stage() ?
50 bt_version_get_development_stage() : "";
51
52 bt_logging_set_global_level(
53 bt_log_get_level_from_env("LIBBABELTRACE2_INIT_LOG_LEVEL"));
54 BT_LOGI("Babeltrace %u.%u.%u%s library loaded: "
55 "major=%u, minor=%u, patch=%u, extra=\"%s\"",
56 bt_version_get_major(), bt_version_get_minor(),
57 bt_version_get_patch(), v_extra,
58 bt_version_get_major(), bt_version_get_minor(),
59 bt_version_get_patch(), v_extra);
60 }
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