1 files changed, 96 insertions, 0 deletions
diff --git a/src/include/common/logging.h b/src/include/common/logging.h
new file mode 100644
index 0000000..a71cf84
--- /dev/null
+++ b/src/include/common/logging.h
@@ -0,0 +1,96 @@
+/*-------------------------------------------------------------------------
+ * Logging framework for frontend programs
+ *
+ * Copyright (c) 2018-2021, PostgreSQL Global Development Group
+ *
+ * src/include/common/logging.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef COMMON_LOGGING_H
+#define COMMON_LOGGING_H
+
+/*
+ * Log levels are informational only.  They do not affect program flow.
+ */
+enum pg_log_level
+{
+	/*
+	 * Not initialized yet
+	 */
+	PG_LOG_NOTSET = 0,
+
+	/*
+	 * Low level messages that are normally off by default.
+	 */
+	PG_LOG_DEBUG,
+
+	/*
+	 * Any program messages that go to stderr, shown by default.  (The
+	 * program's normal output should go to stdout and not use the logging
+	 * system.)
+	 */
+	PG_LOG_INFO,
+
+	/*
+	 * Warnings and "almost" errors, depends on the program
+	 */
+	PG_LOG_WARNING,
+
+	/*
+	 * Errors
+	 */
+	PG_LOG_ERROR,
+
+	/*
+	 * Severe errors that cause program termination.  (One-shot programs may
+	 * chose to label even fatal errors as merely "errors".  The distinction
+	 * is up to the program.)
+	 */
+	PG_LOG_FATAL,
+
+	/*
+	 * Turn all logging off.
+	 */
+	PG_LOG_OFF,
+};
+
+extern enum pg_log_level __pg_log_level;
+
+/*
+ * Kind of a hack to be able to produce the psql output exactly as required by
+ * the regression tests.
+ */
+#define PG_LOG_FLAG_TERSE	1
+
+void		pg_logging_init(const char *argv0);
+void		pg_logging_config(int new_flags);
+void		pg_logging_set_level(enum pg_log_level new_level);
+void		pg_logging_increase_verbosity(void);
+void		pg_logging_set_pre_callback(void (*cb) (void));
+void		pg_logging_set_locus_callback(void (*cb) (const char **filename, uint64 *lineno));
+
+void		pg_log_generic(enum pg_log_level level, const char *pg_restrict fmt,...) pg_attribute_printf(2, 3);
+void		pg_log_generic_v(enum pg_log_level level, const char *pg_restrict fmt, va_list ap) pg_attribute_printf(2, 0);
+
+#define pg_log_fatal(...) do { \
+		if (likely(__pg_log_level <= PG_LOG_FATAL)) pg_log_generic(PG_LOG_FATAL, __VA_ARGS__); \
+	} while(0)
+
+#define pg_log_error(...) do { \
+		if (likely(__pg_log_level <= PG_LOG_ERROR)) pg_log_generic(PG_LOG_ERROR, __VA_ARGS__); \
+	} while(0)
+
+#define pg_log_warning(...) do { \
+		if (likely(__pg_log_level <= PG_LOG_WARNING)) pg_log_generic(PG_LOG_WARNING, __VA_ARGS__); \
+	} while(0)
+
+#define pg_log_info(...) do { \
+		if (likely(__pg_log_level <= PG_LOG_INFO)) pg_log_generic(PG_LOG_INFO, __VA_ARGS__); \
+	} while(0)
+
+#define pg_log_debug(...) do { \
+		if (unlikely(__pg_log_level <= PG_LOG_DEBUG)) pg_log_generic(PG_LOG_DEBUG, __VA_ARGS__); \
+	} while(0)
+
+#endif							/* COMMON_LOGGING_H */