test: add test for new sd-bus refcnt logic

diff --git a/src/libsystemd/sd-bus/test-bus-queue-ref-cycle.c b/src/libsystemd/sd-bus/test-bus-queue-ref-cycle.c
new file mode 100644 (file)
index 0000000..70901c3
--- /dev/null
+++ b/src/libsystemd/sd-bus/test-bus-queue-ref-cycle.c
@@ -0,0 +1,44 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include "main-func.h"
+#include "sd-bus.h"
+#include "tests.h"
+
+static int run(int argc, char *argv[]) {
+        sd_bus_message *m = NULL;
+        sd_bus *bus = NULL;
+        int r;
+
+        /* This test will result in a memory leak in <= v240, but not on v241. Hence to be really useful it
+         * should be run through a leak tracker such as valgrind. */
+
+        r = sd_bus_open_system(&bus);
+        if (r < 0)
+                return log_tests_skipped("Failed to connect to bus");
+
+        /* Create a message and enqueue it (this shouldn't send it though as the connection setup is not complete yet) */
+        assert_se(sd_bus_message_new_method_call(bus, &m, "foo.bar", "/foo", "quux.quux", "waldo") >= 0);
+        assert_se(sd_bus_send(bus, m, NULL) >= 0);
+
+        /* Let's now unref the message first and the bus second. */
+        m = sd_bus_message_unref(m);
+        bus = sd_bus_unref(bus);
+
+        /* We should have a memory leak now on <= v240. Let's do this again, but destory in the opposite
+         * order. On v240 that too should be a leak. */
+
+        r = sd_bus_open_system(&bus);
+        if (r < 0)
+                return log_tests_skipped("Failed to connect to bus");
+
+        assert_se(sd_bus_message_new_method_call(bus, &m, "foo.bar", "/foo", "quux.quux", "waldo") >= 0);
+        assert_se(sd_bus_send(bus, m, NULL) >= 0);
+
+        /* Let's now unref things in the opposite order */
+        bus = sd_bus_unref(bus);
+        m = sd_bus_message_unref(m);
+
+        return 0;
+}
+
+DEFINE_MAIN_FUNCTION(run);

diff --git a/src/test/meson.build b/src/test/meson.build
index 86d8a30..c53b965 100644 (file)
--- a/src/test/meson.build
+++ b/src/test/meson.build
@@ -867,6 +867,10 @@ tests += [
          [],
          [threads]],
 
+        [['src/libsystemd/sd-bus/test-bus-queue-ref-cycle.c'],
+         [],
+         [threads]],
+
         [['src/libsystemd/sd-bus/test-bus-watch-bind.c'],
          [],
          [threads], '', 'timeout=120'],