Expand datastores to add the notion of inheritance. This will be needed for

the conversion of IAX2 variables from the current custom method to ast_storage.


git-svn-id: http://svn.digium.com/svn/asterisk/trunk@57691 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 7 insertions, 0 deletions

diff --git a/include/asterisk/channel.h b/include/asterisk/channel.h
index 55596b147..1f7f3934a 100644
--- a/include/asterisk/channel.h
+++ b/include/asterisk/channel.h
@@ -153,7 +153,9 @@ extern "C" {
 #include "asterisk/linkedlists.h"
 #include "asterisk/stringfields.h"
 #include "asterisk/compiler.h"
+#include <limits.h>
 
+#define DATASTORE_INHERIT_FOREVER	INT_MAX
 
 #define AST_MAX_FDS		10
 /*
@@ -185,6 +187,7 @@ struct ast_generator {
 /*! \brief Structure for a data store type */
 struct ast_datastore_info {
 	const char *type;		/*!< Type of data store */
+	void *(*duplicate)(void *data);	/*!< Duplicate item data (used for inheritance) */
 	void (*destroy)(void *data);	/*!< Destroy function */
 };
 
@@ -193,6 +196,7 @@ struct ast_datastore {
 	char *uid;		/*!< Unique data store identifier */
 	void *data;		/*!< Contained data */
 	const struct ast_datastore_info *info;	/*!< Data store type information */
+	unsigned int inheritance;	/*!< Number of levels this item will continue to be inherited */
 	AST_LIST_ENTRY(ast_datastore) entry; /*!< Used for easy linking */
 };
 
@@ -608,6 +612,9 @@ struct ast_datastore *ast_channel_datastore_alloc(const struct ast_datastore_inf
 /*! \brief Free a channel datastore structure */
 int ast_channel_datastore_free(struct ast_datastore *datastore);
 
+/*! \brief Inherit datastores from a parent to a child. */
+int ast_channel_datastore_inherit(struct ast_channel *from, struct ast_channel *to);
+
 /*! \brief Add a datastore to a channel */
 int ast_channel_datastore_add(struct ast_channel *chan, struct ast_datastore *datastore);