+YAZ_BEGIN_CDECL
+
+#define YLOG_FATAL 0x00000001
+#define YLOG_DEBUG 0x00000002
+#define YLOG_WARN 0x00000004
+#define YLOG_LOG 0x00000008
+#define YLOG_ERRNO 0x00000010 /* append strerror to message */
+/*#define YLOG_FILE 0x00000020 */
+/*#define YLOG_APP 0x00000040 */
+ /* Application level events (new-connection) */
+#define YLOG_MALLOC 0x00000080 /* debugging mallocs */
+#define YLOG_NOTIME 0x00000100 /* do not output date and time */
+/* #define YLOG_APP2 0x00000200 */
+ /* Application-level events, such as api calls */
+/* #define YLOG_APP3 0x00000400 */
+ /* For more application-level events */
+#define YLOG_FLUSH 0x00000800 /* Flush log after every write (DEBUG does too) */
+#define YLOG_LOGLVL 0x00001000 /* log when modules query log levels */
+ /* this has to be a hard-coded bit, not to loop*/
+
+#define YLOG_ALL (0xffff&~YLOG_MALLOC&~YLOG_NOTIME)
+
+#define YLOG_DEFAULT_LEVEL \
+ (YLOG_FATAL | YLOG_ERRNO | YLOG_LOG | YLOG_WARN | YLOG_FLUSH)
+/* not having flush here confuses Solaris users, who won't see any logs until
+ * (and if) the program exits normally */
+
+#define YLOG_LAST_BIT YLOG_LOGLVL /* the last bit used for regular log bits */
+ /* the rest are for dynamic modules */
+
+
+/**
+ * yaz_log_init is a shorthand for initializing the log level and prefixes */
+YAZ_EXPORT void yaz_log_init(int level, const char *prefix, const char *name);
+
+/** yaz_log_init_file sets the file name used for yaz_log */
+YAZ_EXPORT void yaz_log_init_file(const char *fname);
+
+/** yaz_log_init_level sets the logging level. Use an OR of the bits above */
+YAZ_EXPORT void yaz_log_init_level(int level);
+
+/** yaz_log_init_prefix sets the log prefix */
+YAZ_EXPORT void yaz_log_init_prefix(const char *prefix);
+
+/** yaz_log_init_prefix2 sets an optional second prefix */
+YAZ_EXPORT void yaz_log_init_prefix2(const char *prefix);
+
+/**
+ * yaz_log_time_format sets the format of the timestamp. See man 3 strftime
+ * Calling with "old" sets to the old format "11:55:06-02/11"
+ * Calling with NULL or "" sets to the new format "20041102-115719"
+ * If not called at all, the old format is used, for backward compatibility