+#include <stdio.h>
+#include <yaz/yconfig.h>
+
+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);