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-rw-r--r--src/libsystemd-bus/sd-bus.c12
-rw-r--r--src/libsystemd-bus/test-bus-objects.c6
2 files changed, 14 insertions, 4 deletions
diff --git a/src/libsystemd-bus/sd-bus.c b/src/libsystemd-bus/sd-bus.c
index 1d8d569429..3fd5186763 100644
--- a/src/libsystemd-bus/sd-bus.c
+++ b/src/libsystemd-bus/sd-bus.c
@@ -2100,7 +2100,15 @@ static int method_callbacks_run(
return 1;
}
- return c->vtable->method.handler(bus, m, u);
+ if (c->vtable->method.handler)
+ return c->vtable->method.handler(bus, m, u);
+
+ /* If the method callback is NULL, make this a successful NOP */
+ r = sd_bus_reply_method_return(bus, m, NULL);
+ if (r < 0)
+ return r;
+
+ return 1;
}
static int invoke_property_get(
@@ -3761,7 +3769,7 @@ static int add_object_vtable_internal(
if (!member_name_is_valid(v->method.member) ||
!signature_is_valid(v->method.signature, false) ||
!signature_is_valid(v->method.result, false) ||
- !v->method.handler ||
+ !(v->method.handler || (isempty(v->method.signature) && isempty(v->method.result))) ||
v->flags & (SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE|SD_BUS_VTABLE_PROPERTY_INVALIDATE_ONLY)) {
r = -EINVAL;
goto fail;
diff --git a/src/libsystemd-bus/test-bus-objects.c b/src/libsystemd-bus/test-bus-objects.c
index 06947a2c18..637e0511b2 100644
--- a/src/libsystemd-bus/test-bus-objects.c
+++ b/src/libsystemd-bus/test-bus-objects.c
@@ -39,8 +39,6 @@
* Add in:
*
* automatic properties for Set()
- * automatic NULL method
- * allow NULL as signatures in vtable
* node hierarchy updates during dispatching
* emit_interfaces_added/emit_interfaces_removed
*
@@ -157,6 +155,7 @@ static const sd_bus_vtable vtable[] = {
SD_BUS_WRITABLE_PROPERTY("Something", "s", get_handler, set_handler, 0, 0),
SD_BUS_PROPERTY("AutomaticStringProperty", "s", NULL, offsetof(struct context, automatic_string_property), 0),
SD_BUS_PROPERTY("AutomaticIntegerProperty", "u", NULL, offsetof(struct context, automatic_integer_property), 0),
+ SD_BUS_METHOD("NoOperation", "", "", NULL, 0),
SD_BUS_VTABLE_END
};
@@ -241,6 +240,9 @@ static int client(struct context *c) {
assert_se(sd_bus_set_fd(bus, c->fds[1], c->fds[1]) >= 0);
assert_se(sd_bus_start(bus) >= 0);
+ r = sd_bus_call_method(bus, "org.freedesktop.systemd.test", "/foo", "org.freedesktop.systemd.test", "NoOperation", &error, NULL, NULL);
+ assert_se(r >= 0);
+
r = sd_bus_call_method(bus, "org.freedesktop.systemd.test", "/foo", "org.freedesktop.systemd.test", "AlterSomething", &error, &reply, "s", "hallo");
assert_se(r >= 0);