Retrieve SQL Agent Process ID via T-SQL below SQL Server 2008 R2 SP1.

Dear Folks,

I have to retrieve the process ID of SQL Agent (as shown in Configuration Manager) via T-SQL Script. It can be easily retrieved in SQL Server 2008 R2 SP1 or above using 'sys.dm_server_services' DMV. But I have to retrieve it in SQL Server 2008 R2 RTM and above DMV was not introduced in it. Using XP_cmdshell 'tasklist' is useless as well, as it doesn't reflect the instance specific details of SQLAgent process. Please Suggest the solution. Thanks in advance. :)   

Pranshul Gupta