+ if (!(flags & MDB_RDONLY)) {
+ MDB_txn *txn;
+ int tsize = sizeof(MDB_txn), size = tsize + env->me_maxdbs *
+ (sizeof(MDB_db)+sizeof(MDB_cursor)+sizeof(unsigned int)+1);
+ txn = calloc(1, size);
+ if (txn) {
+ txn->mt_dbs = (MDB_db *)((char *)txn + tsize);
+ txn->mt_cursors = (MDB_cursor **)(txn->mt_dbs + env->me_maxdbs);
+ txn->mt_dbiseqs = (unsigned int *)(txn->mt_cursors + env->me_maxdbs);
+ txn->mt_dbflags = (unsigned char *)(txn->mt_dbiseqs + env->me_maxdbs);
+ txn->mt_env = env;
+ env->me_txn0 = txn;
+ } else {
+ rc = ENOMEM;
+ }
+ }