— Scheme Procedure: input-port

Return gdb's input port as a Guile port object.

— Scheme Procedure: output-port

Return gdb's output port as a Guile port object.

— Scheme Procedure: error-port

Return gdb's error port as a Guile port object.

— Scheme Procedure: stdio-port? object

Return #t if object is a gdb stdio port. Otherwise return #f.