From 5d941c92bd0209abdfbc171d588b84df45222706 Mon Sep 17 00:00:00 2001
From: Umut Tezduyar Lindskog <umut.tezduyar@axis.com>
Date: Mon, 8 Jun 2015 10:00:17 +0200
Subject: [PATCH] sd-bus: add async convenience method call API

---
 src/libsystemd/libsystemd.sym.m4        |  1 +
 src/libsystemd/sd-bus/bus-convenience.c | 37 +++++++++++++++++++++++++
 src/systemd/sd-bus.h                    |  1 +
 3 files changed, 39 insertions(+)

diff --git a/src/libsystemd/libsystemd.sym.m4 b/src/libsystemd/libsystemd.sym.m4
index 0b94a87dd6..3121e71282 100644
--- a/src/libsystemd/libsystemd.sym.m4
+++ b/src/libsystemd/libsystemd.sym.m4
@@ -320,6 +320,7 @@ global:
         sd_bus_get_name_creds;
         sd_bus_get_name_machine_id;
         sd_bus_call_method;
+        sd_bus_call_method_async;
         sd_bus_get_property;
         sd_bus_get_property_trivial;
         sd_bus_get_property_string;
diff --git a/src/libsystemd/sd-bus/bus-convenience.c b/src/libsystemd/sd-bus/bus-convenience.c
index 28bc8d2818..dfd82e746d 100644
--- a/src/libsystemd/sd-bus/bus-convenience.c
+++ b/src/libsystemd/sd-bus/bus-convenience.c
@@ -58,6 +58,43 @@ _public_ int sd_bus_emit_signal(
         return sd_bus_send(bus, m, NULL);
 }
 
+_public_ int sd_bus_call_method_async(
+                sd_bus *bus,
+                sd_bus_slot **slot,
+                const char *destination,
+                const char *path,
+                const char *interface,
+                const char *member,
+                sd_bus_message_handler_t callback,
+                void *userdata,
+                const char *types, ...) {
+
+        _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
+        int r;
+
+        assert_return(bus, -EINVAL);
+        assert_return(!bus_pid_changed(bus), -ECHILD);
+
+        if (!BUS_IS_OPEN(bus->state))
+                return -ENOTCONN;
+
+        r = sd_bus_message_new_method_call(bus, &m, destination, path, interface, member);
+        if (r < 0)
+                return r;
+
+        if (!isempty(types)) {
+                va_list ap;
+
+                va_start(ap, types);
+                r = bus_message_append_ap(m, types, ap);
+                va_end(ap);
+                if (r < 0)
+                        return r;
+        }
+
+        return sd_bus_call_async(bus, slot, m, callback, userdata, 0);
+}
+
 _public_ int sd_bus_call_method(
                 sd_bus *bus,
                 const char *destination,
diff --git a/src/systemd/sd-bus.h b/src/systemd/sd-bus.h
index e6e2ecd0b7..57e46ced8e 100644
--- a/src/systemd/sd-bus.h
+++ b/src/systemd/sd-bus.h
@@ -299,6 +299,7 @@ int sd_bus_get_name_machine_id(sd_bus *bus, const char *name, sd_id128_t *machin
 /* Convenience calls */
 
 int sd_bus_call_method(sd_bus *bus, const char *destination, const char *path, const char *interface, const char *member, sd_bus_error *ret_error, sd_bus_message **reply, const char *types, ...);
+int sd_bus_call_method_async(sd_bus *bus, sd_bus_slot **slot, const char *destination, const char *path, const char *interface, const char *member, sd_bus_message_handler_t callback, void *userdata, const char *types, ...);
 int sd_bus_get_property(sd_bus *bus, const char *destination, const char *path, const char *interface, const char *member, sd_bus_error *ret_error, sd_bus_message **reply, const char *type);
 int sd_bus_get_property_trivial(sd_bus *bus, const char *destination, const char *path, const char *interface, const char *member, sd_bus_error *ret_error, char type, void *ret_ptr);
 int sd_bus_get_property_string(sd_bus *bus, const char *destination, const char *path, const char *interface, const char *member, sd_bus_error *ret_error, char **ret); /* free the result! */