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pg_include/catalog/objectaccess.h

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+/*
+ * objectaccess.h
+ *
+ *		Object access hooks.
+ *
+ * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ */
+
+#ifndef OBJECTACCESS_H
+#define OBJECTACCESS_H
+
+/*
+ * Object access hooks are intended to be called just before or just after
+ * performing certain actions on a SQL object.	This is intended as
+ * infrastructure for security or logging pluggins.
+ *
+ * OAT_POST_CREATE should be invoked just after the object is created.
+ * Typically, this is done after inserting the primary catalog records and
+ * associated dependencies.
+ *
+ * OAT_DROP should be invoked just before deletion of objects; typically
+ * deleteOneObject(). Its arguments are packed within ObjectAccessDrop.
+ *
+ * Other types may be added in the future.
+ */
+typedef enum ObjectAccessType
+{
+	OAT_POST_CREATE,
+	OAT_DROP,
+} ObjectAccessType;
+
+/*
+ * Arguments of OAT_DROP event
+ */
+typedef struct
+{
+	/*
+	 * Flags to inform extensions the context of this deletion. Also see
+	 * PERFORM_DELETION_* in dependency.h
+	 */
+	int			dropflags;
+} ObjectAccessDrop;
+
+/*
+ * Hook, and a macro to invoke it.
+ */
+typedef void (*object_access_hook_type) (ObjectAccessType access,
+													 Oid classId,
+													 Oid objectId,
+													 int subId,
+													 void *arg);
+
+extern PGDLLIMPORT object_access_hook_type object_access_hook;
+
+#define InvokeObjectAccessHook(access,classId,objectId,subId,arg)	\
+	do {															\
+		if (object_access_hook)										\
+			(*object_access_hook)((access),(classId),				\
+								  (objectId),(subId),(arg));		\
+	} while(0)
+
+#endif   /* OBJECTACCESS_H */