From 86551828abbafc90f52fc17ba095f48e28edab3b Mon Sep 17 00:00:00 2001
From: Salvador Ortiz <sog@msg.com.mx>
Date: Fri, 9 Aug 2013 11:03:28 -0500
Subject: [PATCH] ITS#7660 Add mdb_txn_env to API

---
 libraries/liblmdb/lmdb.h | 6 ++++++
 libraries/liblmdb/mdb.c  | 7 +++++++
 2 files changed, 13 insertions(+)

diff --git a/libraries/liblmdb/lmdb.h b/libraries/liblmdb/lmdb.h
index 8bd341cca1..b18c099433 100644
--- a/libraries/liblmdb/lmdb.h
+++ b/libraries/liblmdb/lmdb.h
@@ -762,6 +762,12 @@ int  mdb_env_get_maxkeysize(MDB_env *env);
 	 */
 int  mdb_txn_begin(MDB_env *env, MDB_txn *parent, unsigned int flags, MDB_txn **txn);
 
+	/** @brief Returns the transaction's #MDB_env
+	 *
+	 * @param[in] txn A transaction handle returned by #mdb_txn_begin()
+	 */
+MDB_env *mdb_txn_env(MDB_txn *txn);
+
 	/** @brief Commit all the operations of a transaction into the database.
 	 *
 	 * The transaction handle is freed. It and its cursors must not be used
diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index 02c7f067e3..e0916a1bf0 100644
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -2307,6 +2307,13 @@ mdb_txn_begin(MDB_env *env, MDB_txn *parent, unsigned int flags, MDB_txn **ret)
 	return rc;
 }
 
+MDB_env *
+mdb_txn_env(MDB_txn *txn)
+{
+	if(!txn) return NULL;
+	return txn->mt_env;
+}
+
 /** Export or close DBI handles opened in this txn. */
 static void
 mdb_dbis_update(MDB_txn *txn, int keep)