SWI-Prolog -- API-function PL_get_trace

Documentation
- Reference manual
  - Foreign Language Interface
    - The Foreign Include File
      - Argument Passing and Control
        
        Implementing a yield based debugger
        
        PL_get_trace_context()
        
        PL_set_trace_action,term_t+action()
- Packages

Availability:C-language interface function

bool PL_get_trace_context(term_t -msg)

Unify msg with a Prolog term of the following shape: frame(Frame, Choice, Port, PC). This provides the same information as passed to prolog_trace_interception/4. The additional PC argument provides the program counter in the executing clause. The msg term may be passed to print_message/2 to print the current port and goal, similarly to the commandline debugger.