BUG#47059 - In audit plugin I cannot see the event subclasses,

            e.g.MYSQL_AUDIT_GENERAL_ERROR

General audit API (MYSQL_AUDIT_GENERAL_CLASS) didn't expose event
subclass to plugins.

This patch exposes event subclass to plugins via
struct mysql_event_general::event_subclass.

This change is not compatible with existing general audit plugins.
Audit interface major version has been incremented.

include/mysql/plugin_audit.h:
  Expose event subclass to audit general plugins.
plugin/audit_null/audit_null.c:
  Added distinct counters for general event sub-classes.
  
  Removed printf() from deinit(). One can easily see number of
  calls via status variables.
  
  To make code nicer, modified class mask to use macro instead
  of hardcoded number.
  
  Incremented audit plugin minor version.
sql/sql_audit.cc:
  Expose event subclass to audit general plugins.

1 files changed, 4 insertions, 3 deletions

diff --git a/include/mysql/plugin_audit.h b/include/mysql/plugin_audit.h
index 8932767075d..41505da64af 100644
--- a/include/mysql/plugin_audit.h
+++ b/include/mysql/plugin_audit.h
@@ -24,7 +24,7 @@
 
 #define MYSQL_AUDIT_CLASS_MASK_SIZE 1
 
-#define MYSQL_AUDIT_INTERFACE_VERSION 0x0100
+#define MYSQL_AUDIT_INTERFACE_VERSION 0x0200
 
 /*
   The first word in every event class struct indicates the specific
@@ -32,7 +32,7 @@
 */
 struct mysql_event
 {
-  int event_class;
+  unsigned int event_class;
 };
 
 
@@ -52,7 +52,8 @@ struct mysql_event
 
 struct mysql_event_general
 {
-  int event_class;
+  unsigned int event_class;
+  unsigned int event_subclass;
   int general_error_code;
   unsigned long general_thread_id;
   const char *general_user;