Also parse the config_tree on the client end (daemon-client.c).

daemons/common/daemon-client.c

@@ -44,13 +44,18 @@ daemon_reply daemon_send(daemon_handle h, daemon_request rq)
 	write_buffer(h.socket_fd, rq.buffer, strlen(rq.buffer));
 
 	if (read_buffer(h.socket_fd, &reply.buffer)) {
-		/* TODO: parse reply.buffer into reply.cft */
+		reply.cft = create_config_tree_from_string(reply.buffer);
 	} else
 		reply.error = 1;
 
 	return reply;
 }
 
+void daemon_reply_destroy(daemon_reply r) {
+	if (r.cft)
+		destroy_config_tree(r.cft);
+}
+
 daemon_reply daemon_send_simple(daemon_handle h, char *id, ...)
 {
 	va_list ap;

daemons/common/daemon-client.h

@@ -41,13 +41,13 @@ typedef struct {
 	 *        knobs = [ "twiddle", "tweak" ]
 	 *    }
 	 */
-	struct config_node *cft;
+	struct config_tree *cft;
 } daemon_request;
 
 typedef struct {
 	int error; /* 0 for success */
 	char *buffer; /* textual reply */
-	struct config_node *cft; /* parsed reply, if available */
+	struct config_tree *cft; /* parsed reply, if available */
 } daemon_reply;
 
 /*
@@ -79,6 +79,8 @@ daemon_reply daemon_send(daemon_handle h, daemon_request r);
  */
 daemon_reply daemon_send_simple(daemon_handle h, char *id, ...);
 
+void daemon_reply_destroy(daemon_reply r);
+
 /* Shut down the communication to the daemon. Compulsory. */
 void daemon_close(daemon_handle h);
 

daemons/common/daemon-server.c

@@ -25,6 +25,7 @@
 
 #include <syslog.h>
 #include "daemon-server.h"
+#include "daemon-shared.h"
 #include "libdevmapper.h"
 
 #if 0
@@ -200,6 +201,18 @@ static void _daemonise(void)
 	setsid();
 }
 
+response daemon_reply_simple(char *id, ...)
+{
+	va_list ap;
+	va_start(ap, id);
+	response res = { .buffer = format_buffer(id, ap), .cft = NULL };
+
+	if (!res.buffer)
+		res.error = ENOMEM;
+
+	return res;
+}
+
 struct thread_baton {
 	daemon_state s;
 	client_handle client;

daemons/common/daemon-server.h

@@ -38,6 +38,12 @@ typedef struct {
 
 struct daemon_state;
 
+/*
+ * Craft a simple reply, without the need to construct a config_tree. See
+ * daemon_send_simple in daemon-client.h for the description of the parameters.
+ */
+response daemon_reply_simple(char *id, ...);
+
 /*
  * The callback. Called once per request issued, in the respective client's
  * thread. It is presented by a parsed request (in the form of a config tree).

daemons/lvmetad/lvmetad-core.c

@@ -6,11 +6,9 @@ typedef struct {
 
 static response handler(daemon_state s, client_handle h, request r)
 {
-	response res;
+	fprintf(stderr, "[D] REQUEST: %s, param = %d\n", find_config_str(r.cft->root, "request", "NONE"),
-	fprintf(stderr, "[D] REQUEST: %s\n", find_config_str(r.cft->root, "request", "NONE"));
+		                                         find_config_int(r.cft->root, "param", -1));
-	res.error = 1;
+	return daemon_reply_simple("hey there", "param = %d", 42, NULL);
-	res.buffer = strdup("hey hey.\n\n");
-	return res;
 }
 
 static int setup_post(daemon_state *s)

daemons/lvmetad/testclient.c

@@ -5,7 +5,9 @@ int main() {
 	int i;
 	for (i = 0; i < 5; ++i ) {
 		daemon_reply reply = daemon_send_simple(h, "hello world", "param = %d", 3, NULL);
-		fprintf(stderr, "[C] obtained: %s\n", reply.buffer);
+		fprintf(stderr, "[C] REPLY: %s, param = %d\n", find_config_str(reply.cft->root, "request", "NONE"),
+			                                       find_config_int(reply.cft->root, "param", -1));
+		daemon_reply_destroy(reply);
 	}
 	daemon_close(h);
 	return 0;