core: convert PID 1 to libsystemd-bus

This patch converts PID 1 to libsystemd-bus and thus drops the
dependency on libdbus. The only remaining code using libdbus is a test
case that validates our bus marshalling against libdbus' marshalling,
and this dependency can be turned off.

This patch also adds a couple of things to libsystem-bus, that are
necessary to make the port work:

- Synthesizing of "Disconnected" messages when bus connections are
  severed.

- Support for attaching multiple vtables for the same interface on the
  same path.

This patch also fixes the SetDefaultTarget() and GetDefaultTarget() bus
calls which used an inappropriate signature.

As a side effect we will now generate PropertiesChanged messages which
carry property contents, rather than just invalidation information.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/core/service.h b/src/core/service.h
index 37fa6ff0fa..5c53791753 100644
--- a/src/core/service.h
+++ b/src/core/service.h
@@ -130,7 +130,7 @@ struct Service {
 
         dual_timestamp watchdog_timestamp;
         usec_t watchdog_usec;
-        Watch watchdog_watch;
+        sd_event_source *watchdog_event_source;
 
         ExecCommand* exec_command[_SERVICE_EXEC_COMMAND_MAX];
 
@@ -191,7 +191,7 @@ struct Service {
 
         UnitRef accept_socket;
 
-        Watch timer_watch;
+        sd_event_source *timer_event_source;
         PathSpec *pid_file_pathspec;
 
         NotifyAccess notify_access;