From 77377be35acb8c9a7c437248c6ef9eb87f589004 Mon Sep 17 00:00:00 2001
From: David Lamparter <equinox@diac24.net>
Date: Thu, 10 Oct 2013 23:22:25 +0000
Subject: async support (more or less)

---
 jsonrpc.c | 9 ++++++++-
 jsonrpc.h | 3 +++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/jsonrpc.c b/jsonrpc.c
index a02bbaa..54ad96c 100644
--- a/jsonrpc.c
+++ b/jsonrpc.c
@@ -6,6 +6,9 @@
 #include <jansson.h>
 #include "jsonrpc.h"
 
+int dummy = 0;
+json_t *jsonrpc_async_dummy = (json_t *)&dummy;
+
 json_t *jsonrpc_error_object(int code, json_t *data)
 {
 	// reference to data is stolen
@@ -199,7 +202,11 @@ json_t *jsonrpc_handle_request_single(void *apparg, json_t *json_request, struct
 		json_result = NULL;
 	} else {
 		if (rc==0) {
-			json_response = jsonrpc_result_response(json_id, json_result);
+			if (json_result == jsonrpc_async_dummy)
+				json_response = NULL;
+			else
+				json_response = jsonrpc_result_response(
+					json_id, json_result);
 		} else if (rc==JSONRPC_INVALID_PARAMS) {
 			json_response = jsonrpc_error_response(json_id,
 					jsonrpc_error_object(JSONRPC_INVALID_PARAMS, json_result));
diff --git a/jsonrpc.h b/jsonrpc.h
index d4a34f8..1a113ef 100644
--- a/jsonrpc.h
+++ b/jsonrpc.h
@@ -6,6 +6,8 @@
 #define JSONRPC_INVALID_PARAMS -32602
 #define JSONRPC_INTERNAL_ERROR -32603
 
+extern json_t *jsonrpc_async_dummy;
+
 typedef int (*jsonrpc_method_prototype)(void *apparg, json_t *json_params, json_t **result);
 struct jsonrpc_method_entry_t
 {
@@ -15,4 +17,5 @@ struct jsonrpc_method_entry_t
 };
 char *jsonrpc_handler(void *apparg, const char *input, size_t input_len, struct jsonrpc_method_entry_t method_table[]);
 
+json_t *jsonrpc_result_response(json_t *json_id, json_t *json_result);
 json_t *jsonrpc_error_object(int code, json_t *data);
-- 
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