+enum log_levels
+{
+ Log_Level_Emergency = 0,
+ Log_Level_Alert = 1,
+ Log_Level_Critical = 2,
+ Log_Level_Error = 3,
+ Log_Level_Warning = 4,
+ Log_Level_Notice = 5,
+ Log_Level_Info = 6,
+ Log_Level_Debug = 7
+};
+
+extern void verbose(int loglevel, const char *file, int line, const char *function, const char *fmt, ...) __attribute__((format(printf, 5, 6)));
+extern void vverbose(int loglevel, const char *file, int line, const char *function, const char *fmt, va_list args);
+
+# define _VERBOSE_(vlvl,llvl,...) do{ if (verbosity >= vlvl) verbose(llvl, __FILE__, __LINE__, __func__, __VA_ARGS__); } while(0)
+# define ERROR(...) _VERBOSE_(Verbosity_Level_Error, Log_Level_Error, __VA_ARGS__)
+# define WARNING(...) _VERBOSE_(Verbosity_Level_Warning, Log_Level_Warning, __VA_ARGS__)
+# define NOTICE(...) _VERBOSE_(Verbosity_Level_Notice, Log_Level_Notice, __VA_ARGS__)
+# define INFO(...) _VERBOSE_(Verbosity_Level_Info, Log_Level_Info, __VA_ARGS__)
+# define DEBUG(...) _VERBOSE_(Verbosity_Level_Debug, Log_Level_Debug, __VA_ARGS__)
+# define LOGUSER(app) verbose_set_name(app,0)
+# define LOGAUTH(app) verbose_set_name(app,1)
+
+extern void (*verbose_observer)(int loglevel, const char *file, int line, const char *function, const char *fmt, va_list args);