1 files changed, 18 insertions, 4 deletions
diff --git a/src/instance.h b/src/instance.h
index b0be665..e7e5943 100644
--- a/src/instance.h
+++ b/src/instance.h
@@ -5,12 +5,26 @@
 
 struct l2_instance {
   uuid_t uuid;
-  char *name;
-  char *path;
+  const char *name;
+  const char *path;
+
+  struct l2_instance *next;
+  struct l2_instance *prev;
+};
+
+enum {
+  INSTANCE_SUCCESS, /* instance operation succeeded */
+  INSTANCE_ERRNO,   /* instance operation failed (error code in errno) */
+  INSTANCE_EJSON,   /* instance operation failed (JSON error) */
+  INSTANCE_EFORMAT  /* instance file is malformed */
 };
 
-void l2_instance_load(void);
+/* load all instances (must be called after initialization) */
+int l2_instance_load_all(void);
+
+int l2_instance_save_all(void);
 
-void l2_instance_save(void);
+int l2_instance_add_instance(const struct l2_instance *inst);
+int l2_instance_del_instance(struct l2_instance *inst);
 
 #endif /* include guard */