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_LOG_MINIMAL_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                 (int) 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 }