Attachment 526127 Details for Bug 802525

[patch] dbus-fall-back-to-old-run-directory.patch

dbus-fall-back-to-old-run-directory.patch (text/plain), 9.37 KB, created by Hans Petter Jansson on 2013-02-22 17:16:31 UTC

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Creator: Hans Petter Jansson

Created: 2013-02-22 17:16:31 UTC

Size: 9.37 KB

patch

obsolete

>diff --git a/dbus/dbus-bus.c b/dbus/dbus-bus.c
>index fadc3a8..2c71cdb 100644
>--- a/dbus/dbus-bus.c
>+++ b/dbus/dbus-bus.c
>@@ -421,6 +421,153 @@ _dbus_bus_notify_shared_connection_disconnected_unlocked (DBusConnection *connec
>   _DBUS_UNLOCK (bus);
> }
> 
>+static dbus_bool_t
>+internal_register (DBusConnection *connection,
>+                   int             timeout_milliseconds,
>+                   DBusError      *error)
>+{
>+  DBusMessage *message, *reply;
>+  char *name;
>+  BusData *bd;
>+  dbus_bool_t retval;
>+
>+  _dbus_return_val_if_fail (connection != NULL, FALSE);
>+  _dbus_return_val_if_error_is_set (error, FALSE);
>+
>+  retval = FALSE;
>+  message = NULL;
>+  reply = NULL;
>+
>+  _DBUS_LOCK (bus_datas);
>+
>+  bd = ensure_bus_data (connection);
>+  if (bd == NULL)
>+    {
>+      _DBUS_SET_OOM (error);
>+      goto out;
>+    }
>+
>+  if (bd->unique_name != NULL)
>+    {
>+      _dbus_verbose ("Ignoring attempt to register the same DBusConnection %s with the message bus a second time.\n",
>+                     bd->unique_name);
>+      /* Success! */
>+      retval = TRUE;
>+      goto out;
>+    }
>+  
>+  message = dbus_message_new_method_call (DBUS_SERVICE_DBUS,
>+                                          DBUS_PATH_DBUS,
>+                                          DBUS_INTERFACE_DBUS,
>+                                          "Hello"); 
>+
>+  if (!message)
>+    {
>+      _DBUS_SET_OOM (error);
>+      goto out;
>+    }
>+  
>+  reply = dbus_connection_send_with_reply_and_block (connection, message, timeout_milliseconds, error);
>+
>+  if (reply == NULL)
>+    goto out;
>+  else if (dbus_set_error_from_message (error, reply))
>+    goto out;
>+  else if (!dbus_message_get_args (reply, error,
>+                                   DBUS_TYPE_STRING, &name,
>+                                   DBUS_TYPE_INVALID))
>+    goto out;
>+  
>+  bd->unique_name = _dbus_strdup (name);
>+  if (bd->unique_name == NULL)
>+    {
>+      _DBUS_SET_OOM (error);
>+      goto out;
>+    }
>+  
>+  retval = TRUE;
>+  
>+ out:
>+  _DBUS_UNLOCK (bus_datas);
>+
>+  if (message)
>+    dbus_message_unref (message);
>+
>+  if (reply)
>+    dbus_message_unref (reply);
>+
>+  return retval;
>+}
>+
>+static DBusConnection *
>+internal_open_and_register (const char *address, dbus_bool_t private, int timeout_milliseconds, DBusError *error)
>+{
>+  DBusConnection *connection;
>+
>+  if (private)
>+    connection = dbus_connection_open_private (address, error);
>+  else
>+    connection = dbus_connection_open (address, error);
>+
>+  if (!connection)
>+    {
>+      goto out;
>+    }
>+
>+  if (!internal_register (connection, timeout_milliseconds, error))
>+    {
>+      _dbus_connection_close_possibly_shared (connection);
>+      dbus_connection_unref (connection);
>+      connection = NULL;
>+      goto out;
>+    }
>+
>+out:
>+  return connection;
>+}
>+
>+/* When the D-Bus upgrade that moves /var/run/dbus/ to /run/dbus/ is applied,
>+ * D-Bus cannot be restarted with the new socket in /run/, because the session
>+ * wouldn't be able to cope with it. We end up with a daemon listening on
>+ * /var/run/dbus/system_bus_socket, but clients will now try to register
>+ * with it on /run/dbus/system_bus_socket, causing the upgrade, and eventually
>+ * critical parts of the user's session, to hang.
>+ *
>+ * The workaround is inelegant, but probably good enough: We allow the initial
>+ * attempt to time out quickly and fall back to trying the old default address.
>+ * If that fails too, we go back to blocking on the initial address. */
>+
>+#define OLD_SYSTEM_BUS_DEFAULT_ADDRESS "unix:path=/var/run/dbus/system_bus_socket"
>+#define INITIAL_TIMEOUT_MILLISECONDS 250
>+#define INCREMENT_TIMEOUT_MILLISECONDS 250
>+#define MAX_TIMEOUT_MILLISECONDS 10000
>+
>+static DBusConnection *
>+internal_open_and_register_with_fallback (const char *address, dbus_bool_t private, DBusError *error)
>+{
>+  DBusConnection *connection = NULL;
>+  int timeout_milliseconds;
>+
>+  for (timeout_milliseconds = INITIAL_TIMEOUT_MILLISECONDS;
>+       connection == NULL && timeout_milliseconds < MAX_TIMEOUT_MILLISECONDS;
>+       timeout_milliseconds += INCREMENT_TIMEOUT_MILLISECONDS)
>+    {
>+      connection = internal_open_and_register (address, private, timeout_milliseconds, NULL);
>+
>+      if (!connection && !strcmp (address, DBUS_SYSTEM_BUS_DEFAULT_ADDRESS))
>+          connection = internal_open_and_register (OLD_SYSTEM_BUS_DEFAULT_ADDRESS, private, timeout_milliseconds, NULL);
>+    }
>+
>+  if (!connection)
>+    {
>+      /* We couldn't register with any of the sockets; fall back to original behavior, blocking
>+       * forever or returning an error. */
>+      connection = internal_open_and_register (address, private, -1, error);
>+    }
>+
>+  return connection;
>+}
>+
> static DBusConnection *
> internal_bus_get (DBusBusType  type,
>                   dbus_bool_t  private,
>@@ -474,21 +621,10 @@ internal_bus_get (DBusBusType  type,
>       goto out;
>     }
> 
>-  if (private)
>-    connection = dbus_connection_open_private (address, error);
>-  else
>-    connection = dbus_connection_open (address, error);
>-  
>-  if (!connection)
>-    {
>-      goto out;
>-    }
>+  connection = internal_open_and_register_with_fallback (address, private, error);
> 
>-  if (!dbus_bus_register (connection, error))
>+  if (!connection)
>     {
>-      _dbus_connection_close_possibly_shared (connection);
>-      dbus_connection_unref (connection);
>-      connection = NULL;
>       goto out;
>     }
> 
>diff --git a/dbus/dbus-connection.c b/dbus/dbus-connection.c
>index ee33b6c..b87c6f7 100644
>--- a/dbus/dbus-connection.c
>+++ b/dbus/dbus-connection.c
>@@ -348,7 +348,7 @@ static void               _dbus_connection_update_dispatch_status_and_unlock (DB
> static void               _dbus_connection_last_unref                        (DBusConnection     *connection);
> static void               _dbus_connection_acquire_dispatch                  (DBusConnection     *connection);
> static void               _dbus_connection_release_dispatch                  (DBusConnection     *connection);
>-static DBusDispatchStatus _dbus_connection_flush_unlocked                    (DBusConnection     *connection);
>+static DBusDispatchStatus _dbus_connection_flush_unlocked                    (DBusConnection     *connection, int timeout_milliseconds);
> static void               _dbus_connection_close_possibly_shared_and_unlock  (DBusConnection     *connection);
> static dbus_bool_t        _dbus_connection_get_is_connected_unlocked         (DBusConnection     *connection);
> static dbus_bool_t        _dbus_connection_peek_for_reply_unlocked           (DBusConnection     *connection,
>@@ -2367,7 +2367,7 @@ _dbus_connection_block_pending_call (DBusPendingCall *pending)
>   DBusConnection *connection;
>   dbus_uint32_t client_serial;
>   DBusTimeout *timeout;
>-  int timeout_milliseconds, elapsed_milliseconds;
>+  int timeout_milliseconds = -1, elapsed_milliseconds;
> 
>   _dbus_assert (pending != NULL);
> 
>@@ -2379,7 +2379,12 @@ _dbus_connection_block_pending_call (DBusPendingCall *pending)
>   connection = _dbus_pending_call_get_connection_and_lock (pending);
>   
>   /* Flush message queue - note, can affect dispatch status */
>-  _dbus_connection_flush_unlocked (connection);
>+
>+  timeout = _dbus_pending_call_get_timeout_unlocked (pending);
>+  if (timeout)
>+    timeout_milliseconds = dbus_timeout_get_interval (timeout);
>+
>+  _dbus_connection_flush_unlocked (connection, timeout_milliseconds);
> 
>   client_serial = _dbus_pending_call_get_reply_serial_unlocked (pending);
> 
>@@ -3555,7 +3560,7 @@ dbus_connection_send_with_reply_and_block (DBusConnection     *connection,
>  * @param connection the connection.
>  */
> static DBusDispatchStatus
>-_dbus_connection_flush_unlocked (DBusConnection *connection)
>+_dbus_connection_flush_unlocked (DBusConnection *connection, int timeout_milliseconds)
> {
>   /* We have to specify DBUS_ITERATION_DO_READING here because
>    * otherwise we could have two apps deadlock if they are both doing
>@@ -3563,20 +3568,36 @@ _dbus_connection_flush_unlocked (DBusConnection *connection)
>    * dispatch status.
>    */
>   DBusDispatchStatus status;
>+  long start_tv_sec, start_tv_usec;
>+  long tv_sec, tv_usec;
>+  int elapsed_milliseconds = 0;
> 
>   HAVE_LOCK_CHECK (connection);
>+
>+  _dbus_get_monotonic_time (&start_tv_sec, &start_tv_usec);
>   
>   while (connection->n_outgoing > 0 &&
>          _dbus_connection_get_is_connected_unlocked (connection))
>     {
>       _dbus_verbose ("doing iteration in\n");
>+
>+      if (timeout_milliseconds >= 0)
>+        {
>+          _dbus_get_monotonic_time (&tv_sec, &tv_usec);
>+          elapsed_milliseconds = (tv_sec - start_tv_sec) * 1000 +
>+            (tv_usec - start_tv_usec) / 1000;
>+
>+          if (elapsed_milliseconds >= timeout_milliseconds)
>+            break;
>+        }
>+
>       HAVE_LOCK_CHECK (connection);
>       _dbus_connection_do_iteration_unlocked (connection,
>                                               NULL,
>                                               DBUS_ITERATION_DO_READING |
>                                               DBUS_ITERATION_DO_WRITING |
>                                               DBUS_ITERATION_BLOCK,
>-                                              -1);
>+                                              timeout_milliseconds - elapsed_milliseconds);
>     }
> 
>   HAVE_LOCK_CHECK (connection);
>@@ -3606,7 +3627,7 @@ dbus_connection_flush (DBusConnection *connection)
>   
>   CONNECTION_LOCK (connection);
> 
>-  status = _dbus_connection_flush_unlocked (connection);
>+  status = _dbus_connection_flush_unlocked (connection, -1);
>   
>   HAVE_LOCK_CHECK (connection);
>   /* Unlocks and calls out to user code */

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Attachments on bug 802525: 524392 | 524393 | 525839 | 526127 | 547343