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/babeltrace.h>
  25
  26 #define BT_LOG_TAG "LIB/LOGGING"
  27 #include "lib/logging.h"
  28
  29 /*
  30  * This is exported because even though the Python plugin provider is a
  31  * different shared object for packaging purposes, it's still considered
  32  * part of the library and therefore needs the library's run-time log
  33  * level.
  34  *
  35  * The default log level is NONE: we don't print logging statements for
  36  * any executable which links with the library. The executable must call
  37  * bt_logging_set_global_level() or the executable's user must set the
  38  * `LIBBABELTRACE2_INIT_LOG_LEVEL` environment variable to enable
  39  * logging.
  40  */
  41 int bt_lib_log_level = BT_LOG_NONE;
  42
  43 enum bt_logging_level bt_logging_get_minimal_level(void)
  44 {
  45         return BT_MINIMAL_LOG_LEVEL;
  46 }
  47
  48 enum bt_logging_level bt_logging_get_global_level(void)
  49 {
  50         return bt_lib_log_level;
  51 }
  52
  53 void bt_logging_set_global_level(enum bt_logging_level log_level)
  54 {
  55         bt_lib_log_level = log_level;
  56 }
  57
  58 static
  59 void __attribute__((constructor)) bt_logging_ctor(void)
  60 {
  61         const char *v_extra = bt_version_get_extra() ? bt_version_get_extra() :
  62                 "";
  63
  64         bt_logging_set_global_level(
  65                 bt_log_get_level_from_env("LIBBABELTRACE2_INIT_LOG_LEVEL"));
  66         BT_LOGI("Babeltrace %d.%d.%d%s library loaded: "
  67                 "major=%d, minor=%d, patch=%d, extra=\"%s\"",
  68                 bt_version_get_major(), bt_version_get_minor(),
  69                 bt_version_get_patch(), v_extra,
  70                 bt_version_get_major(), bt_version_get_minor(),
  71                 bt_version_get_patch(), v_extra);
  72 }