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 }