/*
 *   call-seq:
 *      context.frame_file(frame_position) -> string
 *
 *   Returns the name of the file.
 */
static VALUE
context_frame_file(int argc, VALUE *argv, VALUE self)
{
    VALUE frame;
    debug_context_t *debug_context;

    debug_check_started();
    frame = optional_frame_position(argc, argv);
    Data_Get_Struct(self, debug_context_t, debug_context);

    return rb_str_new2(GET_FRAME->file);
}