[syslog-ng] Syslog-ng open source version -- program_override option

Hi, I want to pass the source file name with each syslog-ng message. I am using program_override option for this. But program_override option overrides the program name field value present in the syslog-ng messages. source source_sys_log { file("/root/log/syslog.log" program_override("syslog.log")); } Let me know how to pass source file name in the syslog-ng message? I am using open source version of syslog-ng. Regards Vaibhav