ITS#7196 use IOV_MAX if it's defined and small

diff --git a/libraries/libmdb/mdb.c b/libraries/libmdb/mdb.c
index 925aae6a9f7fa71fe385a8c247c4e50a3530bf06..f028ecb286fef00cb84f6ad76f46f9d068e2c481 100644 (file)
--- a/libraries/libmdb/mdb.c
+++ b/libraries/libmdb/mdb.c
@@ -947,6 +947,10 @@ struct MDB_env {
 };
        /** max number of pages to commit in one writev() call */
 #define MDB_COMMIT_PAGES        64
+#if defined(IOV_MAX) && IOV_MAX < MDB_COMMIT_PAGES
+#undef MDB_COMMIT_PAGES
+#define MDB_COMMIT_PAGES       IOV_MAX
+#endif
 
 static MDB_page *mdb_page_alloc(MDB_cursor *mc, int num);
 static MDB_page *mdb_page_new(MDB_cursor *mc, uint32_t flags, int num);