diff --git a/c/bdb.c b/c/bdb.c
index 8115b37..53ae3c1 100644
--- a/c/bdb.c
+++ b/c/bdb.c
@@ -1,5 +1,8 @@
 #include "bdb.h"
 
+static s48_value scheme_DB_VERSION = S48_FALSE;
+static s48_value scheme_DB_VERSION_VERBOSE = S48_FALSE;
+
 /* initialise flag constants */
 static s48_value scheme_DB_RPCCLIENT = S48_FALSE;
 static s48_value scheme_DB_INIT_LOCK = S48_FALSE;
@@ -51,7 +54,6 @@ static s48_value scheme_DB_MULTIPLE_KEY = S48_FALSE;
 static s48_value scheme_DB_TXN_NOSYNC = S48_FALSE;
 static s48_value scheme_DB_TXN_NOWAIT = S48_FALSE;
 static s48_value scheme_DB_TXN_SYNC = S48_FALSE;
-
 static s48_value scheme_DB_DONOTINDEX = S48_FALSE;
 static s48_value scheme_DB_FILEOPEN = S48_FALSE;
 static s48_value scheme_DB_KEYEMPTY = S48_FALSE;
@@ -76,6 +78,35 @@ static s48_value scheme_DB_REP_UNAVAIL = S48_FALSE;
 static s48_value scheme_DB_RUNRECOVERY = S48_FALSE;
 static s48_value scheme_DB_SECONDARY_BAD = S48_FALSE;
 static s48_value scheme_DB_VERIFY_BAD = S48_FALSE;
+static s48_value scheme_DB_LOCK_NOWAIT = S48_FALSE;
+static s48_value scheme_DB_ENCRYPT_AES = S48_FALSE;
+static s48_value scheme_DB_CDB_ALLDB = S48_FALSE;
+static s48_value scheme_DB_DIRECT_DB = S48_FALSE;
+static s48_value scheme_DB_DIRECT_LOG = S48_FALSE;
+static s48_value scheme_DB_LOG_AUTOREMOVE = S48_FALSE;
+static s48_value scheme_DB_NOLOCKING = S48_FALSE;
+static s48_value scheme_DB_NOPANIC = S48_FALSE;
+static s48_value scheme_DB_OVERWRITE = S48_FALSE;
+static s48_value scheme_DB_PANIC_ENVIRONMENT = S48_FALSE;
+static s48_value scheme_DB_REGION_INIT = S48_FALSE;
+static s48_value scheme_DB_TIME_NOTGRANTED = S48_FALSE;
+static s48_value scheme_DB_TXN_NOT_DURABLE = S48_FALSE;
+static s48_value scheme_DB_TXN_WRITE_NOSYNC = S48_FALSE;
+static s48_value scheme_DB_FORCE = S48_FALSE;
+static s48_value scheme_DB_CHKSUM = S48_FALSE;
+static s48_value scheme_DB_ENCRYPT = S48_FALSE;
+static s48_value scheme_DB_DUP = S48_FALSE;
+static s48_value scheme_DB_DUPSORT = S48_FALSE;
+static s48_value scheme_DB_RECNUM = S48_FALSE;
+static s48_value scheme_DB_REVSPLITOFF = S48_FALSE;
+static s48_value scheme_DB_RENUMBER = S48_FALSE;
+static s48_value scheme_DB_SNAPSHOT = S48_FALSE;
+static s48_value scheme_DB_PREV_NODUP = S48_FALSE;
+static s48_value scheme_DB_AFTER = S48_FALSE;
+static s48_value scheme_DB_BEFORE = S48_FALSE;
+static s48_value scheme_DB_KEYFIRST = S48_FALSE;
+static s48_value scheme_DB_KEYLAST = S48_FALSE;
+
 
 /* initialise DB_TYPES */
 static s48_value scheme_DB_BTREE = S48_FALSE;
@@ -277,6 +308,8 @@ s48_value scsh_bdb_env_lock_get(s48_value senv_handle, s48_value slocker_id,
 
   res = dbenv->lock_get(dbenv, locker_id, flags, &object,
 			lock_mode, lock);
+  if (res > 0)
+    s48_raise_os_error(res);
   return s48_list_2(s48_enter_integer(res),
 		    (res == 0) ? s48_enter_integer((long) lock) : S48_FALSE);
 }
@@ -438,8 +471,8 @@ s48_value scsh_bdb_env_get_encrypt_flags(s48_value senv_handle)
   res = dbenv->get_encrypt_flags(dbenv, &flags);
   if (res > 0)
     s48_raise_os_error(res);
-  else
-    return s48_list_2(s48_enter_integer(res), s48_enter_integer(flags));
+  return s48_list_2(s48_enter_integer(res), 
+		    s48_enter_integer(flags));
 }
 
 /* set timeout for locks and transactions */
@@ -477,6 +510,8 @@ s48_value scsh_bdb_env_get_timeout(s48_value senv_handle, s48_value lockp)
   flags = (lockp == S48_FALSE) ? DB_SET_TXN_TIMEOUT : DB_SET_LOCK_TIMEOUT;
   S48_GC_UNPROTECT();
   res = dbenv->get_timeout(dbenv, &timeout, flags);
+  if (res > 0)
+    s48_raise_os_error(res);
   return s48_list_2(s48_enter_integer(res),
 		    (res == 0) ? s48_enter_integer((long) timeout) : S48_FALSE);
 }
@@ -508,6 +543,8 @@ s48_value scsh_bdb_env_get_tx_max(s48_value senv_handle)
 
   dbenv = scsh_extract_dbenv(senv_handle);
   res = dbenv->get_tx_max(dbenv, &max);
+  if (res > 0)
+    s48_raise_os_error(res);
   return s48_list_2(s48_enter_integer(res), 
 		    (res == 0) ? s48_enter_integer(max) : S48_FALSE);
 }
@@ -538,6 +575,8 @@ s48_value scsh_bdb_env_get_tx_timestamp(s48_value senv_handle)
 
   dbenv = scsh_extract_dbenv(senv_handle);
   res = dbenv->get_tx_timestamp(dbenv, &timestamp);
+  if (res > 0)
+    s48_raise_os_error(res);
   return s48_list_2(s48_enter_integer(res),
 		    (res == 0) ? s48_enter_integer(timestamp) : S48_FALSE);
 }
@@ -569,6 +608,8 @@ s48_value scsh_bdb_env_get_tmp_dir(s48_value senv_handle)
   
   dbenv = scsh_extract_dbenv(senv_handle);
   res = dbenv->get_tmp_dir(dbenv, (const char **) &tmpdir);
+  if (res > 0)
+    s48_raise_os_error(res);
   return s48_list_2(s48_enter_integer(res),
 		    ((res == 0) && (tmpdir != NULL)) ? 
 		    s48_enter_string(tmpdir) : S48_FALSE);
@@ -601,6 +642,8 @@ s48_value scsh_bdb_env_get_flags(s48_value senv_handle)
 
   dbenv = scsh_extract_dbenv(senv_handle);
   res = dbenv->get_flags(dbenv, &flags);
+  if (res > 0)
+    s48_raise_os_error(res);
   return s48_list_2(s48_enter_integer(res),
 		    (res == 0) ? s48_enter_integer(flags) : S48_FALSE);
 }
@@ -804,6 +847,8 @@ s48_value scsh_bdb_get_encrypt_flags(s48_value sdatabase)
   
   db = scsh_extract_db(sdatabase);
   res = db->get_encrypt_flags(db, &flags);
+  if (res > 0)
+    s48_raise_os_error(res);
   return s48_list_2(s48_enter_integer(res),
 		    (res == 0) ? s48_enter_integer(flags) : S48_FALSE);
 }
@@ -833,6 +878,8 @@ s48_value scsh_bdb_get_flags(s48_value sdatabase)
 
   db = scsh_extract_db(sdatabase);
   res = db->get_flags(db, &flags);
+  if (res > 0)
+    s48_raise_os_error(res);
   return s48_list_2(s48_enter_integer(res),
 		    (res == 0) ? s48_enter_integer(flags) : S48_FALSE);
 }
@@ -858,6 +905,8 @@ s48_value scsh_bdb_get_lorder(s48_value sdatabase)
   
   db = scsh_extract_db(sdatabase);
   res = db->get_lorder(db, &lorder);
+  if (res > 0)
+    s48_raise_os_error(res);
   return s48_list_2(s48_enter_integer(res),
 		    (res == 0) ? ((lorder == 4321) ? S48_TRUE : S48_FALSE) 
 		    : S48_UNSPECIFIC);
@@ -888,6 +937,8 @@ s48_value scsh_bdb_get_pagesize(s48_value sdatabase)
 
   db = scsh_extract_db(sdatabase);
   res = db->get_pagesize(db, &pagesize);
+  if (res > 0)
+    s48_raise_os_error(res);
   return s48_list_2(s48_enter_integer(res),
 		    (res == 0) ? s48_enter_integer(pagesize) : S48_FALSE);
 }
@@ -944,6 +995,9 @@ s48_value scsh_bdb_get(s48_value handle, s48_value skey,
   S48_GC_UNPROTECT();
   res = dbp->get(dbp, txnid, &key, &data, flags);
 
+  if (res > 0)
+    s48_raise_os_error(res);
+
   switch (res) {
   case DB_NOTFOUND: 
   case DB_KEYEMPTY: 
@@ -989,10 +1043,9 @@ s48_value scsh_bdb_create_cursor(s48_value handle, s48_value stxnid,
   DB_TXN *txnid;
   u_int32_t flags;
   s48_value ret = S48_FALSE;
-  
   S48_DECLARE_GC_PROTECT(4);
+
   S48_GC_PROTECT_4(handle, stxnid, sflags, ret);
-  
   dbp = scsh_extract_db(handle);
   flags = s48_extract_integer(sflags);
   txnid = EXTRACT_OPTIONAL_TXNID(stxnid);
@@ -1015,7 +1068,7 @@ s48_value scsh_bdb_close_cursor(s48_value scursor)
   
   res = cursor->c_close(cursor);
   CHECK_BDB_RESULT_CODE(res);
-  return s48_enter_integer(res);
+  return S48_FALSE;
 }
 
 /* retrieve values from cursor */
@@ -1039,6 +1092,57 @@ s48_value scsh_bdb_cursor_cget(s48_value dbc, s48_value sflags)
   return scsh_enter_DBT_as_bytevector(data);
 }
 
+/* return a count of duplicates */
+s48_value scsh_bdb_cursor_count(s48_value scursor)
+{
+  DBC *dbc;
+  int res;
+  db_recno_t countp;
+
+  dbc = scsh_extract_cursor(scursor);
+  res = dbc->c_count(dbc, &countp, 0);
+  if (res > 0)
+    s48_raise_os_error(res);
+  return s48_list_2(s48_enter_integer(res),
+		    (res == 0) ? s48_enter_integer((long) countp) : S48_FALSE);
+}
+
+/* delete by cursor */
+s48_value scsh_bdb_cursor_del(s48_value scursor)
+{
+  DBC *dbc;
+  int res;
+
+  dbc = scsh_extract_cursor(scursor);
+  res = dbc->c_del(dbc, 0);
+  CHECK_BDB_RESULT_CODE(res);
+  return S48_FALSE;
+}
+
+/* store by cursor */
+s48_value scsh_bdb_cursor_put(s48_value scursor, s48_value skey,
+			      s48_value sdata, s48_value sflags)
+{
+  DBT key, data;
+  DBC *dbc;
+  u_int32_t flags;
+  int res;
+  S48_DECLARE_GC_PROTECT(4);
+
+  S48_GC_PROTECT_4(scursor, skey, sdata, sflags);
+  dbc = scsh_extract_cursor(scursor);
+  flags = s48_extract_integer(sflags);
+  memset(&key, 0, sizeof(DBT));
+  memset(&data, 0, sizeof(DBT));
+  scsh_extract_bytevector_as_DBT(skey, &key);
+  scsh_extract_bytevector_as_DBT(sdata, &data);
+  S48_GC_UNPROTECT();
+
+  res = dbc->c_put(dbc, &key, &data, flags);
+  CHECK_BDB_RESULT_CODE(res);
+  return S48_FALSE;
+}
+
 s48_value scsh_bdb_txn_begin (s48_value handle, s48_value sparent, 
 			      s48_value sflags)
 {
@@ -1099,6 +1203,17 @@ s48_value scsh_bdb_txn_commit(s48_value stxnid, s48_value sflags)
 /* initialize bindings */
 void scsh_init_bdb_bindings(void)
 {
+  S48_GC_PROTECT_GLOBAL(scheme_DB_VERSION);
+  scheme_DB_VERSION = s48_list_3(s48_enter_integer(DB_VERSION_MAJOR),
+				 s48_enter_integer(DB_VERSION_MINOR),
+				 s48_enter_integer(DB_VERSION_PATCH));
+  s48_define_exported_binding("scheme_DB_VERSION", scheme_DB_VERSION);
+
+  S48_GC_PROTECT_GLOBAL(scheme_DB_VERSION_VERBOSE);
+  scheme_DB_VERSION_VERBOSE = s48_enter_string(DB_VERSION_STRING);
+  s48_define_exported_binding("scheme_DB_VERSION_VERBOSE", 
+			      scheme_DB_VERSION_VERBOSE);
+
   /* records */
   S48_GC_PROTECT_GLOBAL(bdb_db_record_type);
   bdb_db_record_type = s48_get_imported_binding("bdb-db");
@@ -1174,6 +1289,34 @@ void scsh_init_bdb_bindings(void)
   ENTER_INTEGER_CONSTANT(scheme_DB_QUEUE, DB_QUEUE);
   ENTER_INTEGER_CONSTANT(scheme_DB_RECNO, DB_RECNO);
   ENTER_INTEGER_CONSTANT(scheme_DB_UNKNOWN, DB_UNKNOWN);
+  ENTER_INTEGER_CONSTANT(scheme_DB_LOCK_NOWAIT, DB_LOCK_NOWAIT);
+  ENTER_INTEGER_CONSTANT(scheme_DB_ENCRYPT_AES, DB_ENCRYPT_AES);
+  ENTER_INTEGER_CONSTANT(scheme_DB_CDB_ALLDB, DB_CDB_ALLDB);
+  ENTER_INTEGER_CONSTANT(scheme_DB_DIRECT_DB, DB_DIRECT_DB);
+  ENTER_INTEGER_CONSTANT(scheme_DB_DIRECT_LOG, DB_DIRECT_LOG);
+  ENTER_INTEGER_CONSTANT(scheme_DB_LOG_AUTOREMOVE, DB_LOG_AUTOREMOVE);
+  ENTER_INTEGER_CONSTANT(scheme_DB_NOLOCKING, DB_NOLOCKING);
+  ENTER_INTEGER_CONSTANT(scheme_DB_NOPANIC, DB_NOPANIC);
+  ENTER_INTEGER_CONSTANT(scheme_DB_OVERWRITE, DB_OVERWRITE);
+  ENTER_INTEGER_CONSTANT(scheme_DB_PANIC_ENVIRONMENT, DB_PANIC_ENVIRONMENT);
+  ENTER_INTEGER_CONSTANT(scheme_DB_REGION_INIT, DB_REGION_INIT);
+  ENTER_INTEGER_CONSTANT(scheme_DB_TIME_NOTGRANTED, DB_TIME_NOTGRANTED);
+  ENTER_INTEGER_CONSTANT(scheme_DB_TXN_NOT_DURABLE, DB_TXN_NOT_DURABLE);
+  ENTER_INTEGER_CONSTANT(scheme_DB_TXN_WRITE_NOSYNC, DB_TXN_WRITE_NOSYNC);
+  ENTER_INTEGER_CONSTANT(scheme_DB_FORCE, DB_FORCE);
+  ENTER_INTEGER_CONSTANT(scheme_DB_CHKSUM, DB_CHKSUM);
+  ENTER_INTEGER_CONSTANT(scheme_DB_ENCRYPT, DB_ENCRYPT);
+  ENTER_INTEGER_CONSTANT(scheme_DB_DUP, DB_DUP);
+  ENTER_INTEGER_CONSTANT(scheme_DB_DUPSORT, DB_DUPSORT);
+  ENTER_INTEGER_CONSTANT(scheme_DB_RECNUM, DB_RECNUM);
+  ENTER_INTEGER_CONSTANT(scheme_DB_REVSPLITOFF, DB_REVSPLITOFF);
+  ENTER_INTEGER_CONSTANT(scheme_DB_RENUMBER, DB_RENUMBER);
+  ENTER_INTEGER_CONSTANT(scheme_DB_SNAPSHOT, DB_SNAPSHOT);
+  ENTER_INTEGER_CONSTANT(scheme_DB_PREV_NODUP, DB_PREV_NODUP);
+  ENTER_INTEGER_CONSTANT(scheme_DB_AFTER, DB_AFTER);
+  ENTER_INTEGER_CONSTANT(scheme_DB_BEFORE, DB_BEFORE);
+  ENTER_INTEGER_CONSTANT(scheme_DB_KEYFIRST, DB_KEYFIRST);
+  ENTER_INTEGER_CONSTANT(scheme_DB_KEYLAST, DB_KEYLAST);
 
   /* return codes */
   ENTER_INTEGER_CONSTANT(scheme_DB_DONOTINDEX, DB_DONOTINDEX);
@@ -1243,6 +1386,9 @@ void scsh_init_bdb_bindings(void)
   S48_EXPORT_FUNCTION(scsh_bdb_create_cursor);
   S48_EXPORT_FUNCTION(scsh_bdb_close_cursor);
   S48_EXPORT_FUNCTION(scsh_bdb_cursor_cget);
+  S48_EXPORT_FUNCTION(scsh_bdb_cursor_count);
+  S48_EXPORT_FUNCTION(scsh_bdb_cursor_del);
+  S48_EXPORT_FUNCTION(scsh_bdb_cursor_put);
   S48_EXPORT_FUNCTION(scsh_bdb_txn_begin);
   S48_EXPORT_FUNCTION(scsh_bdb_txn_abort);
   S48_EXPORT_FUNCTION(scsh_bdb_txn_commit);