Re-organize sources

[babeltrace.git] / src / lib / logging.c

diff --git a/src/lib/logging.c b/src/lib/logging.c
new file mode 100644 (file)
index 0000000..3c0178c
--- /dev/null
+++ b/src/lib/logging.c
@@ -0,0 +1,89 @@
+/*
+ * Copyright 2017-2018 Philippe Proulx <pproulx@efficios.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <stdlib.h>
+#include <babeltrace2/logging.h>
+#include <babeltrace2/version.h>
+
+#define BT_LOG_TAG "LIB"
+#include "lib/lib-logging.h"
+
+#ifdef BT_DEV_MODE
+/*
+ * Default log level is FATAL in developer mode because fatal logging is
+ * our way to communicate an unsatisfied precondition and the details.
+ */
+# define DEFAULT_LOG_LEVEL     BT_LOG_FATAL
+#else
+/*
+ * In non-developer mode, use NONE by default: we don't to print logging
+ * statements for any executable which links with the library. The
+ * executable should call bt_logging_set_global_level() or the
+ * executable's user should set the BABELTRACE_LOGGING_GLOBAL_LEVEL
+ * environment variable.
+ */
+# define DEFAULT_LOG_LEVEL     BT_LOG_NONE
+#endif /* BT_DEV_MODE */
+
+int bt_lib_log_level = DEFAULT_LOG_LEVEL;
+
+enum bt_logging_level bt_logging_get_minimal_level(void)
+{
+       return BT_LOG_LEVEL;
+}
+
+enum bt_logging_level bt_logging_get_global_level(void)
+{
+       return bt_lib_log_level;
+}
+
+void bt_logging_set_global_level(enum bt_logging_level log_level)
+{
+#ifdef BT_DEV_MODE
+       /*
+        * Do not allow the library's log level to fall to NONE when in
+        * developer mode because fatal logging is our way to
+        * communicate an unsatisfied precondition and the details.
+        */
+       if (log_level == BT_LOG_NONE) {
+               log_level = BT_LOG_FATAL;
+       }
+#endif
+
+       bt_lib_log_level = log_level;
+}
+
+static
+void __attribute__((constructor)) bt_logging_ctor(void)
+{
+       const char *v_extra = bt_version_get_extra() ? bt_version_get_extra() :
+               "";
+
+       bt_logging_set_global_level(
+               bt_log_get_level_from_env("BABELTRACE_LOGGING_GLOBAL_LEVEL"));
+       BT_LOGI("Babeltrace %d.%d.%d%s library loaded: "
+               "major=%d, minor=%d, patch=%d, extra=\"%s\"",
+               bt_version_get_major(), bt_version_get_minor(),
+               bt_version_get_patch(), v_extra,
+               bt_version_get_major(), bt_version_get_minor(),
+               bt_version_get_patch(), v_extra);
+}