How to write a simple debugger?

Question

I would like to connect my compiled object code to the c++ code, and then to check if a certain line of code was executed. How to do those two things?

If the explanation is not simple (I bet it is not), can someone at least point to some web pages explaining how to do this?

I understand that the solution is different for different platforms, but I am interested in how it is done on windows and linux (linux for the start)

Answer 1

If you want to know how it is done,

• gdb is open source
• the ptrace syscall should get you started,
• libunwind-ptrace

this is a nice article using ptrace