From a2ec7f2be1ddfb04a9e7eeb4aa1f28b69a4a961d Mon Sep 17 00:00:00 2001
From: Leo Yuriev <leo@yuriev.ru>
Date: Mon, 19 Mar 2018 17:03:41 +0300
Subject: [PATCH] mdbx: add mdbx_txn_flags().

---
 mdbx.h     | 9 +++++++++
 src/mdbx.c | 7 +++++++
 2 files changed, 16 insertions(+)

diff --git a/mdbx.h b/mdbx.h
index df168eea..36146fb6 100644
--- a/mdbx.h
+++ b/mdbx.h
@@ -982,6 +982,15 @@ LIBMDBX_API int mdbx_txn_begin(MDBX_env *env, MDBX_txn *parent, unsigned flags,
  * [in] txn  A transaction handle returned by mdbx_txn_begin() */
 LIBMDBX_API MDBX_env *mdbx_txn_env(MDBX_txn *txn);
 
+/* Return the transaction's flags.
+ *
+ * This returns the flags associated with this transaction.
+ *
+ * [in] txn A transaction handle returned by mdbx_txn_begin()
+ *
+ * Returns A transaction flags, valid if input is an active transaction. */
+LIBMDBX_API int mdbx_txn_flags(MDBX_txn *txn);
+
 /* Return the transaction's ID.
  *
  * This returns the identifier associated with this transaction. For a
diff --git a/src/mdbx.c b/src/mdbx.c
index faa1541d..bbced7d4 100644
--- a/src/mdbx.c
+++ b/src/mdbx.c
@@ -2987,6 +2987,13 @@ uint64_t mdbx_txn_id(MDBX_txn *txn) {
   return txn->mt_txnid;
 }
 
+int mdbx_txn_flags(MDBX_txn *txn) {
+  if (unlikely(!txn || txn->mt_signature != MDBX_MT_SIGNATURE))
+    return -1;
+
+  return txn->mt_flags;
+}
+
 /* Export or close DBI handles opened in this txn. */
 static void mdbx_dbis_update(MDBX_txn *txn, int keep) {
   MDBX_dbi n = txn->mt_numdbs;