code: func (t *BTTracer) SetPipes(stdin io.Reader, stderr io.Writer) {
  	t.m.Lock()
  	defer t.m.Unlock()
  
  	t.p.stdin = stdin
  	t.p.stderr = stderr
  }
docs: // Sets the input and output pipes for the tracer.
  // Stdout is not redirected; it is instead passed to the
  // tracer's Put command.