gio/gtestdbus.c

   1 /* GIO testing utilities
   2  *
   3  * Copyright (C) 2008-2010 Red Hat, Inc.
   4  * Copyright (C) 2012 Collabora Ltd. <http://www.collabora.co.uk/>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General
  17  * Public License along with this library; if not, write to the
  18  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  19  * Boston, MA 02111-1307, USA.
  20  *
  21  * Authors: David Zeuthen <davidz@redhat.com>
  22  *          Xavier Claessens <xavier.claessens@collabora.co.uk>
  23  */
  24
  25 #include "config.h"
  26
  27 #include <stdlib.h>
  28 #include <stdio.h>
  29 #include <gstdio.h>
  30 #ifdef HAVE_UNISTD_H
  31 #include <unistd.h>
  32 #endif
  33 #ifdef G_OS_WIN32
  34 #include <io.h>
  35 #endif
  36
  37 #include <glib.h>
  38
  39 #include "gdbusconnection.h"
  40 #include "gdbusprivate.h"
  41 #include "gfile.h"
  42 #include "gioenumtypes.h"
  43 #include "gtestdbus.h"
  44
  45 #include "glibintl.h"
  46
  47 #ifdef G_OS_WIN32
  48 #include <windows.h>
  49 #endif
  50
  51 /* -------------------------------------------------------------------------- */
  52 /* Utility: Wait until object has a single ref  */
  53
  54 typedef struct
  55 {
  56   GMainLoop *loop;
  57   gboolean   timed_out;
  58 } WeakNotifyData;
  59
  60 static gboolean
  61 on_weak_notify_timeout (gpointer user_data)
  62 {
  63   WeakNotifyData *data = user_data;
  64   data->timed_out = TRUE;
  65   g_main_loop_quit (data->loop);
  66   return FALSE;
  67 }
  68
  69 static gboolean
  70 unref_on_idle (gpointer object)
  71 {
  72   g_object_unref (object);
  73   return FALSE;
  74 }
  75
  76 static gboolean
  77 _g_object_unref_and_wait_weak_notify (gpointer object)
  78 {
  79   WeakNotifyData data;
  80   guint timeout_id;
  81
  82   data.loop = g_main_loop_new (NULL, FALSE);
  83   data.timed_out = FALSE;
  84
  85   g_object_weak_ref (object, (GWeakNotify) g_main_loop_quit, data.loop);
  86
  87   /* Drop the ref in an idle callback, this is to make sure the mainloop
  88    * is already running when weak notify happens */
  89   g_idle_add (unref_on_idle, object);
  90
  91   /* Make sure we don't block forever */
  92   timeout_id = g_timeout_add (30 * 1000, on_weak_notify_timeout, &data);
  93
  94   g_main_loop_run (data.loop);
  95
  96   g_source_remove (timeout_id);
  97
  98   if (data.timed_out)
  99     {
 100       g_warning ("Weak notify timeout, object ref_count=%d\n",
 101           G_OBJECT (object)->ref_count);
 102     }
 103
 104   return data.timed_out;
 105 }
 106
 107 /* -------------------------------------------------------------------------- */
 108 /* Utilities to cleanup the mess in the case unit test process crash */
 109
 110 #ifdef G_OS_WIN32
 111
 112 /* This could be interesting to expose in public API */
 113 static void
 114 _g_test_watcher_add_pid (GPid pid)
 115 {
 116   static gsize started = 0;
 117   HANDLE job;
 118
 119   if (g_once_init_enter (&started))
 120     {
 121       JOBOBJECT_EXTENDED_LIMIT_INFORMATION info;
 122
 123       job = CreateJobObjectW (NULL, NULL);
 124       memset (&info, 0, sizeof (info));
 125       info.BasicLimitInformation.LimitFlags = 0x2000 /* JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE */;
 126
 127       if (!SetInformationJobObject(job, JobObjectExtendedLimitInformation, &info, sizeof (info)))
 128         g_warning ("Can't enable JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE: %s", g_win32_error_message (GetLastError()));
 129
 130       g_once_init_leave (&started,(gsize)job);
 131     }
 132
 133   job = (HANDLE)started;
 134
 135   if (!AssignProcessToJobObject(job, pid))
 136     g_warning ("Can't assign process to job: %s", g_win32_error_message (GetLastError()));
 137 }
 138
 139 static void
 140 _g_test_watcher_remove_pid (GPid pid)
 141 {
 142   /* No need to unassign the process from the job object as the process
 143      will be killed anyway */
 144 }
 145
 146 #else
 147
 148 #define ADD_PID_FORMAT "add pid %d\n"
 149 #define REMOVE_PID_FORMAT "remove pid %d\n"
 150
 151 static void
 152 watch_parent (gint fd)
 153 {
 154   GIOChannel *channel;
 155   GPollFD fds[1];
 156   GArray *pids_to_kill;
 157
 158   channel = g_io_channel_unix_new (fd);
 159
 160   fds[0].fd = fd;
 161   fds[0].events = G_IO_HUP | G_IO_IN;
 162   fds[0].revents = 0;
 163
 164   pids_to_kill = g_array_new (FALSE, FALSE, sizeof (guint));
 165
 166   do
 167     {
 168       gint num_events;
 169       gchar *command = NULL;
 170       guint pid;
 171       guint n;
 172       GError *error = NULL;
 173
 174       num_events = g_poll (fds, 1, -1);
 175       if (num_events == 0)
 176         continue;
 177
 178       if (fds[0].revents == G_IO_HUP)
 179         {
 180           /* Parent quit, cleanup the mess and exit */
 181           for (n = 0; n < pids_to_kill->len; n++)
 182             {
 183               pid = g_array_index (pids_to_kill, guint, n);
 184               g_print ("cleaning up pid %d\n", pid);
 185               kill (pid, SIGTERM);
 186             }
 187
 188           g_array_unref (pids_to_kill);
 189           g_io_channel_shutdown (channel, FALSE, &error);
 190           g_assert_no_error (error);
 191           g_io_channel_unref (channel);
 192
 193           exit (0);
 194         }
 195
 196       /* Read the command from the input */
 197       g_io_channel_read_line (channel, &command, NULL, NULL, &error);
 198       g_assert_no_error (error);
 199
 200       /* Check for known commands */
 201       if (sscanf (command, ADD_PID_FORMAT, &pid) == 1)
 202         {
 203           g_array_append_val (pids_to_kill, pid);
 204         }
 205       else if (sscanf (command, REMOVE_PID_FORMAT, &pid) == 1)
 206         {
 207           for (n = 0; n < pids_to_kill->len; n++)
 208             {
 209               if (g_array_index (pids_to_kill, guint, n) == pid)
 210                 {
 211                   g_array_remove_index (pids_to_kill, n);
 212                   pid = 0;
 213                   break;
 214                 }
 215             }
 216           if (pid != 0)
 217             {
 218               g_warning ("unknown pid %d to remove", pid);
 219             }
 220         }
 221       else
 222         {
 223           g_warning ("unknown command from parent '%s'", command);
 224         }
 225
 226       g_free (command);
 227     }
 228   while (TRUE);
 229 }
 230
 231 static GIOChannel *
 232 watcher_init (void)
 233 {
 234   static gsize started = 0;
 235   static GIOChannel *channel = NULL;
 236
 237   if (g_once_init_enter (&started))
 238     {
 239       gint pipe_fds[2];
 240
 241       /* fork a child to clean up when we are killed */
 242       if (pipe (pipe_fds) != 0)
 243         {
 244           g_warning ("pipe() failed: %m");
 245           g_assert_not_reached ();
 246         }
 247
 248       switch (fork ())
 249         {
 250         case -1:
 251           g_warning ("fork() failed: %m");
 252           g_assert_not_reached ();
 253           break;
 254
 255         case 0:
 256           /* child */
 257           close (pipe_fds[1]);
 258           watch_parent (pipe_fds[0]);
 259           break;
 260
 261         default:
 262           /* parent */
 263           close (pipe_fds[0]);
 264           channel = g_io_channel_unix_new (pipe_fds[1]);
 265         }
 266
 267       g_once_init_leave (&started, 1);
 268     }
 269
 270   return channel;
 271 }
 272
 273 static void
 274 watcher_send_command (const gchar *command)
 275 {
 276   GIOChannel *channel;
 277   GError *error = NULL;
 278
 279   channel = watcher_init ();
 280
 281   g_io_channel_write_chars (channel, command, -1, NULL, &error);
 282   g_assert_no_error (error);
 283
 284   g_io_channel_flush (channel, &error);
 285   g_assert_no_error (error);
 286 }
 287
 288 /* This could be interesting to expose in public API */
 289 static void
 290 _g_test_watcher_add_pid (GPid pid)
 291 {
 292   gchar *command;
 293
 294   command = g_strdup_printf (ADD_PID_FORMAT, (guint) pid);
 295   watcher_send_command (command);
 296   g_free (command);
 297 }
 298
 299 static void
 300 _g_test_watcher_remove_pid (GPid pid)
 301 {
 302   gchar *command;
 303
 304   command = g_strdup_printf (REMOVE_PID_FORMAT, (guint) pid);
 305   watcher_send_command (command);
 306   g_free (command);
 307 }
 308
 309 #endif
 310
 311 /* -------------------------------------------------------------------------- */
 312 /* GTestDBus object implementation */
 313
 314 /**
 315  * SECTION:gtestdbus
 316  * @short_description: D-Bus testing helper
 317  * @include: gio/gio.h
 318  *
 319  * A helper class for testing code which uses D-Bus without touching the user's
 320  * session bus.
 321  *
 322  * <refsect2 id="gio-D-Bus-Test-Scaffolding">
 323  *   <title>Creating unit tests using GTestDBus</title>
 324  *   <para>
 325  *     Testing of D-Bus services can be tricky because normally we only ever run
 326  *     D-Bus services over an existing instance of the D-Bus daemon thus we
 327  *     usually don't activate D-Bus services that are not yet installed into the
 328  *     target system. The #GTestDBus object makes this easier for us by taking care
 329  *     of the lower level tasks such as running a private D-Bus daemon and looking
 330  *     up uninstalled services in customizable locations, typically in your source code tree.
 331  *   </para>
 332  *   <para>
 333  *     The first thing you will need is a separate service description file for the
 334  *     D-Bus daemon. Typically a 'services' subdirectory of your 'tests' directory
 335  *     is a good place to put this file.
 336  *   </para>
 337  *   <para>
 338  *     The service file should list your service along with an absolute path to the
 339  *     uninstalled service executable in your source tree. Using autotools we would
 340  *     achieve this by adding a file such as 'my-server.service.in' in the services
 341  *     directory and have it processed by configure.
 342  *     <informalexample><programlisting>
 343  *     [D-BUS Service]
 344  *     Name=org.gtk.GDBus.Examples.ObjectManager
 345  *     Exec=@abs_top_builddir@/gio/tests/gdbus-example-objectmanager-server
 346  *     </programlisting></informalexample>
 347  *     You will also need to indicate this service directory in your test
 348  *     fixtures, so you will need to pass the path while compiling your
 349  *     test cases. Typically this is done with autotools with an added
 350  *     preprocessor flag specified to compile your tests such as:
 351  *     <informalexample><programlisting>
 352  *     -DTEST_SERVICES=\""$(abs_top_builddir)/tests/services"\"
 353  *     </programlisting></informalexample>
 354  *   </para>
 355  *   <para>
 356  *     Once you have a service definition file which is local to your source tree,
 357  *     you can proceed to setup a GTest fixture using the GTestDBus scaffolding.
 358  *     <example id="gdbus-test-fixture">
 359  *       <title>Test Fixture for D-Bus services</title>
 360  *       <programlisting>
 361  *         <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/tests/gdbus-test-fixture.c">
 362  *           <xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback>
 363  *         </xi:include>
 364  *       </programlisting>
 365  *     </example>
 366  *   </para>
 367  *   <para>
 368  *     Note that these examples only deal with isolating the D-Bus aspect of your
 369  *     service. To successfully run isolated unit tests on your service you may need
 370  *     some additional modifications to your test case fixture. For example; if your
 371  *     service uses GSettings and installs a schema then it is important that your test service
 372  *     not load the schema in the ordinary installed location (chances are that your service
 373  *     and schema files are not yet installed, or worse; there is an older version of the
 374  *     schema file sitting in the install location).
 375  *   </para>
 376  *   <para>
 377  *     Most of the time we can work around these obstacles using the environment. Since the
 378  *     environment is inherited by the D-Bus daemon created by GTestDBus and then in turn
 379  *     inherited by any services the D-Bus daemon activates, using the setup routine for your
 380  *     fixture is a practical place to help sandbox your runtime environment. For the rather
 381  *     typical GSettings case we can work around this by setting GSETTINGS_SCHEMA_DIR to the
 382  *     in tree directory holding your schemas in the above fixture_setup() routine.
 383  *   </para>
 384  *   <para>
 385  *     The GSettings schemas need to be locally pre-compiled for this to work. This can be achieved
 386  *     by compiling the schemas locally as a step before running test cases, an autotools setup might
 387  *     do the following in the directory holding schemas:
 388  *     <informalexample><programlisting>
 389  *     all-am:
 390  *             $(GLIB_COMPILE_SCHEMAS) .
 391  *
 392  *     CLEANFILES += gschemas.compiled
 393  *     </programlisting></informalexample>
 394  *   </para>
 395  * </refsect2>
 396  */
 397
 398 typedef struct _GTestDBusClass   GTestDBusClass;
 399 typedef struct _GTestDBusPrivate GTestDBusPrivate;
 400
 401 /**
 402  * GTestDBus:
 403  *
 404  * The #GTestDBus structure contains only private data and
 405  * should only be accessed using the provided API.
 406  *
 407  * Since: 2.34
 408  */
 409 struct _GTestDBus {
 410   GObject parent;
 411
 412   GTestDBusPrivate *priv;
 413 };
 414
 415 struct _GTestDBusClass {
 416   GObjectClass parent_class;
 417 };
 418
 419 struct _GTestDBusPrivate
 420 {
 421   GTestDBusFlags flags;
 422   GPtrArray *service_dirs;
 423   GPid bus_pid;
 424   gchar *bus_address;
 425   gboolean up;
 426 };
 427
 428 enum
 429 {
 430   PROP_0,
 431   PROP_FLAGS,
 432 };
 433
 434 G_DEFINE_TYPE_WITH_PRIVATE (GTestDBus, g_test_dbus, G_TYPE_OBJECT)
 435
 436 static void
 437 g_test_dbus_init (GTestDBus *self)
 438 {
 439   self->priv = g_test_dbus_get_instance_private (self);
 440   self->priv->service_dirs = g_ptr_array_new_with_free_func (g_free);
 441 }
 442
 443 static void
 444 g_test_dbus_dispose (GObject *object)
 445 {
 446   GTestDBus *self = (GTestDBus *) object;
 447
 448   if (self->priv->up)
 449     g_test_dbus_down (self);
 450
 451   G_OBJECT_CLASS (g_test_dbus_parent_class)->dispose (object);
 452 }
 453
 454 static void
 455 g_test_dbus_finalize (GObject *object)
 456 {
 457   GTestDBus *self = (GTestDBus *) object;
 458
 459   g_ptr_array_unref (self->priv->service_dirs);
 460   g_free (self->priv->bus_address);
 461
 462   G_OBJECT_CLASS (g_test_dbus_parent_class)->finalize (object);
 463 }
 464
 465 static void
 466 g_test_dbus_get_property (GObject *object,
 467     guint property_id,
 468     GValue *value,
 469     GParamSpec *pspec)
 470 {
 471   GTestDBus *self = (GTestDBus *) object;
 472
 473   switch (property_id)
 474     {
 475       case PROP_FLAGS:
 476         g_value_set_flags (value, g_test_dbus_get_flags (self));
 477         break;
 478       default:
 479         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
 480         break;
 481     }
 482 }
 483
 484 static void
 485 g_test_dbus_set_property (GObject *object,
 486     guint property_id,
 487     const GValue *value,
 488     GParamSpec *pspec)
 489 {
 490   GTestDBus *self = (GTestDBus *) object;
 491
 492   switch (property_id)
 493     {
 494       case PROP_FLAGS:
 495         self->priv->flags = g_value_get_flags (value);
 496         break;
 497       default:
 498         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
 499         break;
 500     }
 501 }
 502
 503 static void
 504 g_test_dbus_class_init (GTestDBusClass *klass)
 505 {
 506   GObjectClass *object_class = G_OBJECT_CLASS (klass);
 507
 508   object_class->dispose = g_test_dbus_dispose;
 509   object_class->finalize = g_test_dbus_finalize;
 510   object_class->get_property = g_test_dbus_get_property;
 511   object_class->set_property = g_test_dbus_set_property;
 512
 513   /**
 514    * GTestDBus:flags:
 515    *
 516    * #GTestDBusFlags specifying the behaviour of the dbus session
 517    *
 518    * Since: 2.34
 519    */
 520   g_object_class_install_property (object_class, PROP_FLAGS,
 521     g_param_spec_flags ("flags",
 522                         P_("dbus session flags"),
 523                         P_("Flags specifying the behaviour of the dbus session"),
 524                         G_TYPE_TEST_DBUS_FLAGS, G_TEST_DBUS_NONE,
 525                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
 526                         G_PARAM_STATIC_STRINGS));
 527
 528 }
 529
 530 static gchar *
 531 write_config_file (GTestDBus *self)
 532 {
 533   GString *contents;
 534   gint fd;
 535   guint i;
 536   GError *error = NULL;
 537   gchar *path = NULL;
 538
 539   fd = g_file_open_tmp ("g-test-dbus-XXXXXX", &path, &error);
 540   g_assert_no_error (error);
 541
 542   contents = g_string_new (NULL);
 543   g_string_append (contents,
 544       "<busconfig>\n"
 545       "  <type>session</type>\n"
 546 #ifdef G_OS_WIN32
 547       "  <listen>nonce-tcp:</listen>\n"
 548 #else
 549       "  <listen>unix:tmpdir=/tmp</listen>\n"
 550 #endif
 551                    );
 552
 553   for (i = 0; i < self->priv->service_dirs->len; i++)
 554     {
 555       const gchar *path = g_ptr_array_index (self->priv->service_dirs, i);
 556
 557       g_string_append_printf (contents,
 558           "  <servicedir>%s</servicedir>\n", path);
 559     }
 560
 561   g_string_append (contents,
 562       "  <policy context=\"default\">\n"
 563       "    <!-- Allow everything to be sent -->\n"
 564       "    <allow send_destination=\"*\" eavesdrop=\"true\"/>\n"
 565       "    <!-- Allow everything to be received -->\n"
 566       "    <allow eavesdrop=\"true\"/>\n"
 567       "    <!-- Allow anyone to own anything -->\n"
 568       "    <allow own=\"*\"/>\n"
 569       "  </policy>\n"
 570       "</busconfig>\n");
 571
 572   g_file_set_contents (path, contents->str, contents->len, &error);
 573   g_assert_no_error (error);
 574
 575   g_string_free (contents, TRUE);
 576
 577   close (fd);
 578
 579   return path;
 580 }
 581
 582 static void
 583 start_daemon (GTestDBus *self)
 584 {
 585   gchar *argv[] = {"dbus-daemon", "--print-address", "--config-file=foo", NULL};
 586   gchar *config_path;
 587   gchar *config_arg;
 588   gint stdout_fd;
 589   GIOChannel *channel;
 590   gsize termpos;
 591   GError *error = NULL;
 592
 593   if (g_getenv ("G_TEST_DBUS_DAEMON") != NULL)
 594     argv[0] = (gchar *)g_getenv ("G_TEST_DBUS_DAEMON");
 595
 596   /* Write config file and set its path in argv */
 597   config_path = write_config_file (self);
 598   config_arg = g_strdup_printf ("--config-file=%s", config_path);
 599   argv[2] = config_arg;
 600
 601   /* Spawn dbus-daemon */
 602   g_spawn_async_with_pipes (NULL,
 603                             argv,
 604                             NULL,
 605 #ifdef G_OS_WIN32
 606                             /* We Need this to get the pid returned on win32 */
 607                             G_SPAWN_DO_NOT_REAP_CHILD |
 608 #endif
 609                             G_SPAWN_SEARCH_PATH,
 610                             NULL,
 611                             NULL,
 612                             &self->priv->bus_pid,
 613                             NULL,
 614                             &stdout_fd,
 615                             NULL,
 616                             &error);
 617   g_assert_no_error (error);
 618
 619   _g_test_watcher_add_pid (self->priv->bus_pid);
 620
 621   /* Read bus address from daemon' stdout */
 622   channel = g_io_channel_unix_new (stdout_fd);
 623   g_io_channel_read_line (channel, &self->priv->bus_address, NULL,
 624       &termpos, &error);
 625   g_assert_no_error (error);
 626   self->priv->bus_address[termpos] = '\0';
 627
 628   /* start dbus-monitor */
 629   if (g_getenv ("G_DBUS_MONITOR") != NULL)
 630     {
 631       gchar *command;
 632
 633       command = g_strdup_printf ("dbus-monitor --address %s",
 634           self->priv->bus_address);
 635       g_spawn_command_line_async (command, NULL);
 636       g_free (command);
 637
 638       g_usleep (500 * 1000);
 639     }
 640
 641   /* Cleanup */
 642   g_io_channel_shutdown (channel, FALSE, &error);
 643   g_assert_no_error (error);
 644   g_io_channel_unref (channel);
 645
 646   /* Don't use g_file_delete since it calls into gvfs */
 647   if (g_unlink (config_path) != 0)
 648     g_assert_not_reached ();
 649
 650   g_free (config_path);
 651   g_free (config_arg);
 652 }
 653
 654 static void
 655 stop_daemon (GTestDBus *self)
 656 {
 657 #ifdef G_OS_WIN32
 658   if (!TerminateProcess (self->priv->bus_pid, 0))
 659     g_warning ("Can't terminate process: %s", g_win32_error_message (GetLastError()));
 660 #else
 661   kill (self->priv->bus_pid, SIGTERM);
 662 #endif
 663   _g_test_watcher_remove_pid (self->priv->bus_pid);
 664   g_spawn_close_pid (self->priv->bus_pid);
 665   self->priv->bus_pid = 0;
 666
 667   g_free (self->priv->bus_address);
 668   self->priv->bus_address = NULL;
 669 }
 670
 671 /**
 672  * g_test_dbus_new:
 673  * @flags: a #GTestDBusFlags
 674  *
 675  * Create a new #GTestDBus object.
 676  *
 677  * Returns: (transfer full): a new #GTestDBus.
 678  */
 679 GTestDBus *
 680 g_test_dbus_new (GTestDBusFlags flags)
 681 {
 682   return g_object_new (G_TYPE_TEST_DBUS,
 683       "flags", flags,
 684       NULL);
 685 }
 686
 687 /**
 688  * g_test_dbus_get_flags:
 689  * @self: a #GTestDBus
 690  *
 691  * Gets the flags of the #GTestDBus object.
 692  *
 693  * Returns: the value of #GTestDBus:flags property
 694  */
 695 GTestDBusFlags
 696 g_test_dbus_get_flags (GTestDBus *self)
 697 {
 698   g_return_val_if_fail (G_IS_TEST_DBUS (self), G_TEST_DBUS_NONE);
 699
 700   return self->priv->flags;
 701 }
 702
 703 /**
 704  * g_test_dbus_get_bus_address:
 705  * @self: a #GTestDBus
 706  *
 707  * Get the address on which dbus-daemon is running. if g_test_dbus_up() has not
 708  * been called yet, %NULL is returned. This can be used with
 709  * g_dbus_connection_new_for_address()
 710  *
 711  * Returns: the address of the bus, or %NULL.
 712  */
 713 const gchar *
 714 g_test_dbus_get_bus_address (GTestDBus *self)
 715 {
 716   g_return_val_if_fail (G_IS_TEST_DBUS (self), NULL);
 717
 718   return self->priv->bus_address;
 719 }
 720
 721 /**
 722  * g_test_dbus_add_service_dir:
 723  * @self: a #GTestDBus
 724  * @path: path to a directory containing .service files
 725  *
 726  * Add a path where dbus-daemon will lookup for .services files. This can't be
 727  * called after g_test_dbus_up().
 728  */
 729 void
 730 g_test_dbus_add_service_dir (GTestDBus *self,
 731     const gchar *path)
 732 {
 733   g_return_if_fail (G_IS_TEST_DBUS (self));
 734   g_return_if_fail (self->priv->bus_address == NULL);
 735
 736   g_ptr_array_add (self->priv->service_dirs, g_strdup (path));
 737 }
 738
 739 /**
 740  * g_test_dbus_up:
 741  * @self: a #GTestDBus
 742  *
 743  * Start a dbus-daemon instance and set DBUS_SESSION_BUS_ADDRESS. After this
 744  * call, it is safe for unit tests to start sending messages on the session bus.
 745  *
 746  * If this function is called from setup callback of g_test_add(),
 747  * g_test_dbus_down() must be called in its teardown callback.
 748  *
 749  * If this function is called from unit test's main(), then g_test_dbus_down()
 750  * must be called after g_test_run().
 751  */
 752 void
 753 g_test_dbus_up (GTestDBus *self)
 754 {
 755   g_return_if_fail (G_IS_TEST_DBUS (self));
 756   g_return_if_fail (self->priv->bus_address == NULL);
 757   g_return_if_fail (!self->priv->up);
 758
 759   start_daemon (self);
 760
 761   g_setenv ("DBUS_SESSION_BUS_ADDRESS", self->priv->bus_address, TRUE);
 762   self->priv->up = TRUE;
 763 }
 764
 765
 766 /**
 767  * g_test_dbus_stop:
 768  * @self: a #GTestDBus
 769  *
 770  * Stop the session bus started by g_test_dbus_up().
 771  *
 772  * Unlike g_test_dbus_down(), this won't verify the #GDBusConnection
 773  * singleton returned by g_bus_get() or g_bus_get_sync() is destroyed. Unit
 774  * tests wanting to verify behaviour after the session bus has been stopped
 775  * can use this function but should still call g_test_dbus_down() when done.
 776  */
 777 void
 778 g_test_dbus_stop (GTestDBus *self)
 779 {
 780   g_return_if_fail (G_IS_TEST_DBUS (self));
 781   g_return_if_fail (self->priv->bus_address != NULL);
 782
 783   stop_daemon (self);
 784 }
 785
 786 /**
 787  * g_test_dbus_down:
 788  * @self: a #GTestDBus
 789  *
 790  * Stop the session bus started by g_test_dbus_up().
 791  *
 792  * This will wait for the singleton returned by g_bus_get() or g_bus_get_sync()
 793  * is destroyed. This is done to ensure that the next unit test won't get a
 794  * leaked singleton from this test.
 795  */
 796 void
 797 g_test_dbus_down (GTestDBus *self)
 798 {
 799   GDBusConnection *connection;
 800
 801   g_return_if_fail (G_IS_TEST_DBUS (self));
 802   g_return_if_fail (self->priv->up);
 803
 804   connection = _g_bus_get_singleton_if_exists (G_BUS_TYPE_SESSION);
 805   if (connection != NULL)
 806     g_dbus_connection_set_exit_on_close (connection, FALSE);
 807
 808   if (self->priv->bus_address != NULL)
 809     stop_daemon (self);
 810
 811   if (connection != NULL)
 812     _g_object_unref_and_wait_weak_notify (connection);
 813
 814   g_unsetenv ("DBUS_SESSION_BUS_ADDRESS");
 815   self->priv->up = FALSE;
 816 }
 817
 818 /**
 819  * g_test_dbus_unset:
 820  *
 821  * Unset DISPLAY and DBUS_SESSION_BUS_ADDRESS env variables to ensure the test
 822  * won't use user's session bus.
 823  *
 824  * This is useful for unit tests that want to verify behaviour when no session
 825  * bus is running. It is not necessary to call this if unit test already calls
 826  * g_test_dbus_up() before acquiring the session bus.
 827  */
 828 void
 829 g_test_dbus_unset (void)
 830 {
 831   g_unsetenv ("DISPLAY");
 832   g_unsetenv ("DBUS_SESSION_BUS_ADDRESS");
 833 }