Notes of GDBus

Conceptions: – D-BUS is an IPC method. what is IPC ? – It is common on Linux-like platform – High level API implemented by dbus-glib, python … so on. – server – client services Notice: use GDBus instead of dbus-glib: comparing 　　　→ GDBus: https://developer.gnome.org/gio/stable/ Then following are some code snippets and configuration examples.

TO-DO: – system.conf (push under the etc/dbus-1/system.d/) – makefile – implement server and client

Server & Client example: pre-define: 　Object: g_dbus_connection_register_object 　Interface name 　Service name Initial: – g_queue_new – g_dbus_node_info_new_for_xml: method calls, signals – g_bus_own_name – GDBusConnection Flows: – Response: g_dbus_method_invocation_return_value – Error handlers … https://linoxide.com/how-tos/d-bus-ipc-mechanism-linux/

system.conf:

<!DOCTYPE busconfig PUBLIC
          "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
          "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
<busconfig>

  <!-- Only root or user avahi can own the Avahi service -->
  <policy user="root">
    <allow own="test.dbuscall.dest"/>
    <allow own="test.dbuscall.source"/>
  </policy>

  <!-- Allow anyone to invoke methods on Avahi server, except SetHostName -->
  <policy context="default">
    <allow send_destination="test.dbuscall.dest"/> <!--server -->
    <allow receive_sender="test.dbuscall.source"/> <!--client-->
  </policy>
</busconfig>

makefile: NEW!! library: gio-unix-2.0 ref: https://developer.gnome.org/gio/stable/ch03.html OLD … libaries: dbus dbus-glib source/header: dbus-1.0 glib-2.0 ref: https://developer.gnome.org/glib/stable/glib-compiling.html

How to test your configuration? a. add test-dbus.conf under /etc/dbus-1/system.d 　adb shell 　mount -o rw,remount / 　adb push /test-dbus.conf /etc/dbus-1/system.d

b. You need two terminals 　terminal i.: 　　adb shell 　　./data/gio_server_test 　terminal ii: 　　adb shell 　　dbus-send –system –print-reply –type=method_call –dest=org.gtk.GDBus.TestServer /org/gtk/GDBus/TestObject org.gtk.GDBus.TestInterface.HelloWorld string:’HiHi’

References: Tutorial: 　https://dbus.freedesktop.org/doc/dbus-tutorial.html Introductions: 　http://takluyver.github.io/posts/understanding-dbus.html 　http://ops9.blogspot.com/2013/08/d-bus.html GDBus: 　https://www.freedesktop.org/wiki/Software/DBusBindings/ 　https://developer.gnome.org/gio/stable/gdbus-convenience.html 　https://developer.gnome.org/gio/stable/gdbus-lowlevel.html