actions: add reference to a_return

The action return can return either a constant value or a reference to a
value.

Signed-off-by: Alice Frosi <afrosi@redhat.com>

2 files changed, 19 insertions, 2 deletions

diff --git a/actions.c b/actions.c
index bb31732..0366916 100644
--- a/actions.c
+++ b/actions.c
@@ -198,7 +198,15 @@ int do_actions(struct action actions[], unsigned int n_actions, int pid,
 			resp.id = id;
 			resp.flags = 0;
 			resp.error = 0;
-			resp.val = actions[i].ret.value;
+			if (actions[i].ret.type == IMMEDIATE) {
+				resp.val = actions[i].ret.value;
+			} else if (actions[i].ret.value_p != NULL) {
+				resp.val = *(actions[i].ret.value_p);
+			} else {
+				fprintf(stderr, "empty reference for the return value");
+				return -1;
+			}
+
 			if (send_target(&resp, notifyfd) == -1)
 				return -1;
 			break;
diff --git a/gluten.h b/gluten.h
index c6cac3c..ae5e212 100644
--- a/gluten.h
+++ b/gluten.h
@@ -52,6 +52,11 @@ enum action_type {
 	A_RETURN,
 };
 
+enum value_type {
+	IMMEDIATE,
+	REFERENCE,
+};
+
 struct act_call {
 	long nr;
 	void *args[6];
@@ -67,7 +72,11 @@ struct act_continue {
 };
 
 struct act_return {
-	int64_t value;
+	enum value_type type;
+	union {
+		int64_t value;
+		int64_t *value_p;
+	};
 };
 
 struct act_inject {