Обсуждение: debugging with child process

can any one help me with the 4th and 5th steps of the following link which is to debug with a child process in postgres.

when I give the following fields in the debug configuration

I am getting the following error-  No source available for "__kernel_vsyscall() at 0xb726a424" 

Is there any better tool other than eclipse to use for editing or knowing about source code in postgres.

Thank you