sd-bus: add a small test case for sd_bus_track

This tests in particular that disconnecting results in the tracking object's
handlers to be called.

.gitignore

@@ -152,6 +152,7 @@
 /test-bus-policy
 /test-bus-server
 /test-bus-signature
+/test-bus-track
 /test-bus-zero-copy
 /test-calendarspec
 /test-cap-list

Makefile.am

@@ -3323,6 +3323,7 @@ tests += \
 	test-bus-error \
 	test-bus-creds \
 	test-bus-gvariant \
+	test-bus-track \
 	test-event \
 	test-netlink \
 	test-local-addresses \
@@ -3366,6 +3367,16 @@ test_bus_cleanup_CFLAGS = \
 test_bus_cleanup_LDADD = \
 	libsystemd-shared.la
 
+test_bus_track_SOURCES = \
+	src/libsystemd/sd-bus/test-bus-track.c
+
+test_bus_track_CFLAGS = \
+	$(AM_CFLAGS) \
+	$(SECCOMP_CFLAGS)
+
+test_bus_track_LDADD = \
+	libsystemd-shared.la
+
 test_bus_server_SOURCES = \
 	src/libsystemd/sd-bus/test-bus-server.c
 

src/libsystemd/sd-bus/test-bus-track.c

@@ -0,0 +1,113 @@
+/***
+  This file is part of systemd.
+
+  Copyright 2016 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <sd-bus.h>
+
+#include "macro.h"
+
+static bool track_cb_called_x = false;
+static bool track_cb_called_y = false;
+
+static int track_cb_x(sd_bus_track *t, void *userdata) {
+
+        log_error("TRACK CB X");
+
+        assert_se(!track_cb_called_x);
+        track_cb_called_x = true;
+
+        /* This means b's name disappeared. Let's now disconnect, to make sure the track handling on disconnect works
+         * as it should. */
+
+        assert_se(shutdown(sd_bus_get_fd(sd_bus_track_get_bus(t)), SHUT_RDWR) >= 0);
+        return 1;
+}
+
+static int track_cb_y(sd_bus_track *t, void *userdata) {
+        int r;
+
+        log_error("TRACK CB Y");
+
+        assert_se(!track_cb_called_y);
+        track_cb_called_y = true;
+
+        /* We got disconnected, let's close everything */
+
+        r = sd_event_exit(sd_bus_get_event(sd_bus_track_get_bus(t)), EXIT_SUCCESS);
+        assert_se(r >= 0);
+
+        return 0;
+}
+
+int main(int argc, char *argv[]) {
+        _cleanup_(sd_event_unrefp) sd_event *event = NULL;
+        _cleanup_(sd_bus_track_unrefp) sd_bus_track *x = NULL, *y = NULL;
+        _cleanup_(sd_bus_unrefp) sd_bus *a = NULL, *b = NULL;
+        const char *unique;
+        int r;
+
+        r = sd_event_default(&event);
+        assert_se(r >= 0);
+
+        r = sd_bus_open_system(&a);
+        if (IN_SET(r, -ECONNREFUSED, -ENOENT)) {
+                log_info("Failed to connect to bus, skipping tests.");
+                return EXIT_TEST_SKIP;
+        }
+        assert_se(r >= 0);
+
+        r = sd_bus_attach_event(a, event, SD_EVENT_PRIORITY_NORMAL);
+        assert_se(r >= 0);
+
+        r = sd_bus_open_system(&b);
+        assert_se(r >= 0);
+
+        r = sd_bus_attach_event(b, event, SD_EVENT_PRIORITY_NORMAL);
+        assert_se(r >= 0);
+
+        /* Watch b's name from a */
+        r = sd_bus_track_new(a, &x, track_cb_x, NULL);
+        assert_se(r >= 0);
+
+        r = sd_bus_get_unique_name(b, &unique);
+        assert_se(r >= 0);
+
+        r = sd_bus_track_add_name(x, unique);
+        assert_se(r >= 0);
+
+        /* Watch's a's own name from a */
+        r = sd_bus_track_new(a, &y, track_cb_y, NULL);
+        assert_se(r >= 0);
+
+        r = sd_bus_get_unique_name(a, &unique);
+        assert_se(r >= 0);
+
+        r = sd_bus_track_add_name(y, unique);
+        assert_se(r >= 0);
+
+        /* Now make b's name disappear */
+        sd_bus_close(b);
+
+        r = sd_event_loop(event);
+        assert_se(r >= 0);
+
+        assert_se(track_cb_called_x);
+        assert_se(track_cb_called_y);
+
+        return 0;
+}