1、编译后，由于没有进行配置，默认是无法运行的。
为了可以正常运行，增加或修改下面的配置文件即可。
/etc/dbus-1.0/system-local.conf
<!-- This configuration file controls the systemwide message bus.
Add a system-local.conf and edit that rather than changing this
file directly. -->
<!-- Note that there are any number of ways you can hose yourself
security-wise by screwing up this file; in particular, you
probably don't want to listen on any more addresses, add any more
auth mechanisms, run as a different user, etc. -->
<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-Bus Bus Configuration 1.0//EN"
"http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
<busconfig>
<!-- Our well-known bus type, do not change this -->
<type>system</type>
<!-- Run as special user -->
<user>messagebus</user>
<!-- Fork into daemon mode -->
<fork/>
<!-- We use system service launching using a helper -->
<standard_system_servicedirs/>
<!-- This is a setuid helper that is used to launch system services -->
<servicehelper>/usr/lib/dbus-1.0/dbus-daemon-launch-helper</servicehelper>
<!-- Write a pid file -->
<pidfile>/var/run/dbus/pid</pidfile>
<!-- Enable logging to syslog -->
<syslog/>
<!-- Only allow socket-credentials-based authentication -->
<auth>EXTERNAL</auth>
<!-- Only listen on a local socket. (abstract=/path/to/socket
means use abstract namespace, don't really create filesystem
file; only Linux supports this. Use path=/whatever on other
systems.) -->
<listen>unix:path=/var/run/dbus/system_bus_socket</listen>
<policy context="default">
<!-- All users can connect to system bus -->
<allow user="*"/>
<!-- Holes must be punched in service configuration files for
name ownership and sending method calls -->
<allow own="*"/>
<allow send_type="method_call"/>
<!-- Signals and reply messages (method returns, errors) are allowed
by default -->
<allow send_type="signal"/>
<allow send_requested_reply="true" send_type="method_return"/>
<allow send_requested_reply="true" send_type="error"/>
<!-- All messages may be received by default -->
<allow receive_type="method_call"/>
<allow receive_type="method_return"/>
<allow receive_type="error"/>
<allow receive_type="signal"/>
<!-- Allow anyone to talk to the message bus -->
<allow send_destination="org.freedesktop.DBus"/>
<!-- But disallow some specific bus services -->
<deny send_destination="org.freedesktop.DBus"
send_interface="org.freedesktop.DBus"
send_member="UpdateActivationEnvironment"/>
<deny send_destination="org.freedesktop.DBus"
send_interface="org.freedesktop.systemd1.Activator"/>
</policy>
<!-- Only systemd, which runs as root, may report activation failures. -->
<policy user="root">
<allow send_destination="org.freedesktop.DBus"
send_interface="org.freedesktop.systemd1.Activator"/>
</policy>
<!-- Config files are placed here that among other things, punch
holes in the above policy for specific services. -->
<includedir>system.d</includedir>
<include if_selinux_enabled="yes" selinux_root_relative="yes">contexts/dbus_contexts</include>
</busconfig>
2、测试消息发送
服务端：
$./testdbus_s.bin receive Listening for signals Match rule sent Got Signal with value: Hello Got Signal with value: Hi Bye......
客户端：
$./testdbus_s.bin send Hello Sending signal with value: Hello Signal Sent $./testdbus_s.bin send Hi Sending signal with value: Hi Signal Sent $./testdbus_s.bin send Bye Sending signal with value: Bye Signal Sent
3、测试方法调用
服务端：
$./testdbus_s.bin listen Listening for method calls Method Invoked with value: Hello Method Invoked with value: Hi Bye......
客户端：
$./testdbus_s.bin query Hello Calling remote method with Hello Request Sent Got Reply: 1, 21614 $./testdbus_s.bin query Hi Calling remote method with Hi Request Sent Got Reply: 1, 21614 $./testdbus_s.bin query Bye Calling remote method with Bye Request Sent Got Reply: 1, 21614