From f02588f914f6cbcac92af12010c979b41d1dbc45 Mon Sep 17 00:00:00 2001
From: Steffen Vogel <post@steffenvogel.de>
Date: Fri, 15 Mar 2019 17:19:28 +0100
Subject: [PATCH] node: add node_prepare()

---
 include/villas/node_type.h | 2 ++
 lib/node.c                 | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/include/villas/node_type.h b/include/villas/node_type.h
index 64a847bf2..eddf431e3 100644
--- a/include/villas/node_type.h
+++ b/include/villas/node_type.h
@@ -111,6 +111,8 @@ struct node_type {
 	 */
 	int (*check)(struct node *n);
 
+	int (*prepare)(struct node *);
+
 	/** Returns a string with a textual represenation of this node.
 	 *
 	 * @param n	A pointer to the node object.
diff --git a/lib/node.c b/lib/node.c
index d7ceaad24..2850bf77a 100644
--- a/lib/node.c
+++ b/lib/node.c
@@ -90,6 +90,10 @@ int node_prepare(struct node *n)
 
 	assert(n->state == STATE_CHECKED);
 
+	ret = node_type(n)->prepare ? node_type(n)->prepare(n) : 0;
+	if (ret)
+		return ret;
+
 	ret = node_direction_prepare(&n->in, n);
 	if (ret)
 		return ret;