src/lib/logging.c

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