Kernel Debugging

[Dennis George]

Hi,
 
I am studying the kernel source of FreeBSD. I like to know the flow of 
packets from NIC to different modules of Kernel and then to the 
user-level. I studied the code and identified some of the functions through 
which the kernel handles network packets..... But I want to check from 
where the control goes to that function....... 
 
So I decided to debug the kernel.... since I have only one machine I am 
not checking for kgdb.... I decided to work with DDB so compiled the 
kernel with option DDB and with debugging enabled (-g option). After 
installing the new kernel I rebooted the system and in the boot prompt I 
gave "-d" option to  enter the debugging module..... My problem is that I 
can't provide any breakpoints with this method... It gives me error 
saying "symbol not found".....  Can anybody tell me where is the 
problem................
 
thanks
Joseph


		
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