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diff --git a/etc/cnid_dbd/dbif.h b/etc/cnid_dbd/dbif.h
index f5d3759f..c936a2b9 100644
--- a/etc/cnid_dbd/dbif.h
+++ b/etc/cnid_dbd/dbif.h
@@ -65,6 +65,13 @@
 #define DBIF_IDX_DIDNAME   2
 #define DBIF_IDX_NAME      3
 
+/* get_lock cmd and return value */
+#define LOCKFILENAME  "lock"
+#define LOCK_FREE          0
+#define LOCK_UNLOCK        1
+#define LOCK_EXCL          2
+#define LOCK_SHRD          3
+
 /* Structures */
 typedef struct {
     char     *name;
@@ -86,6 +93,8 @@ typedef struct {
 } DBD;
 
 /* Functions */
+extern int get_lock(int cmd, const char *dbpath);
+
 extern DBD *dbif_init(const char *envhome, const char *dbname);
 extern int dbif_env_open(DBD *dbd, struct db_param *dbp, uint32_t dbenv_oflags);
 extern int dbif_open(DBD *dbd, struct db_param *dbp, int reindex);