How to get DBus sender's information in the code

[tao wu]

Hi,

The scenario is like this:

In a Linux based handheld device I have a C app which has dbus APIs
ready to be called by 3rd party apps. The DBus APIs are called during
booting time.

Is there any system API I can use to in my functions to print the
caller's ID and save it to syslog?

Thanks in advance!