c('PL_open_foreign

Documentation
- Reference manual
  - Foreign Language Interface
    - The Foreign Include File
      - Discarding Data
        
        PL_open_foreign_frame()
        
        PL_close_foreign_frame()
        
        PL_discard_foreign_frame()
        
        PL_rewind_foreign_frame()
- Packages

Availability:C-language interface function

fid_t PL_open_foreign_frame()

Create a foreign frame, holding a mark that allows the system to undo bindings and destroy data created after it, as well as providing the environment for creating term references. This function is called by the kernel before calling a foreign predicate. Raise a resource exception and returns (fid_t)0 on failure.