add basic (and not very useful) D-Bus support

Makefile

@@ -1,5 +1,5 @@
-CFLAGS=-Wall -Wextra -O0 -g -pipe -D_GNU_SOURCE -fdiagnostics-show-option -Wno-unused-parameter -DUNIT_PATH=\"/tmp/does/not/exist\" `pkg-config --cflags libudev`
-LIBS=-lrt -lcap `pkg-config --libs libudev`
+CFLAGS=-Wall -Wextra -O0 -g -pipe -D_GNU_SOURCE -fdiagnostics-show-option -Wno-unused-parameter -DUNIT_PATH=\"/tmp/does/not/exist\" `pkg-config --cflags libudev dbus-1`
+LIBS=-lrt -lcap `pkg-config --libs libudev dbus-1`
 
 COMMON= \
 	unit.o \
@@ -23,7 +23,11 @@ COMMON= \
 	timer.o \
 	load-dropin.o \
 	execute.o \
-	ratelimit.o
+	ratelimit.o \
+	dbus.o \
+	dbus-manager.o \
+	dbus-unit.o \
+	dbus-job.o
 
 all: systemd test-engine test-job-type systemd-logger
 

conf-parser.h

@@ -8,12 +8,12 @@
 /* An abstract parser for simple, line based, shallow configuration
  * files consisting of variable assignments only. */
 
-typedef int (*config_parser_cb_t)(const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata);
+typedef int (*ConfigParserCallback)(const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata);
 
 /* Wraps info for parsing a specific configuration variable */
 typedef struct ConfigItem {
         const char *lvalue; /* name of the variable */
-        config_parser_cb_t parse; /* Function that is called to parse the variable's value */
+        ConfigParserCallback parse; /* Function that is called to parse the variable's value */
         void *data; /* Where to store the variable's data */
         const char *section;
 } ConfigItem;

dbus-job.c

@@ -0,0 +1,32 @@
+/*-*- Mode: C; c-basic-offset: 8 -*-*/
+
+#include "dbus.h"
+#include "log.h"
+
+static const char introspection[] =
+        DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
+        "<node>"
+        " <interface name=\"org.freedesktop.systemd1.Job\">"
+        " </interface>"
+        BUS_PROPERTIES_INTERFACE
+        BUS_INTROSPECTABLE_INTERFACE
+        "</node>";
+
+DBusHandlerResult bus_job_message_handler(DBusConnection  *connection, DBusMessage  *message, void *data) {
+        Manager *m = data;
+
+        assert(connection);
+        assert(message);
+        assert(m);
+
+        log_debug("Got D-Bus request: %s.%s() on %s",
+                  dbus_message_get_interface(message),
+                  dbus_message_get_member(message),
+                  dbus_message_get_path(message));
+
+        return bus_default_message_handler(m, message, introspection, NULL);
+}
+
+const DBusObjectPathVTable bus_job_vtable = {
+        .message_function = bus_job_message_handler
+};