err = err1
		}
		return err
	})
	return pr, nil
}

func (c *Cmd) childStdout() (*os.File, error) {
	return c.writerDescriptor(c.Stdout)
}

func (c *Cmd) childStderr(childStdout *os.File) (*os.File, error) {
	if c.Stderr != nil && interfaceEqual(c.Stderr, c.Stdout) {
		return childStdout, nil
	}
	return c.writerDescriptor(c.Stderr)
}

	}

	cmd := testenv.Command(t, tmpBinary)
	cmd.Env = append(cmd.Environ(), "GO_DEATHSIG_PARENT=1")
	chldStdin, err := cmd.StdinPipe()
	if err != nil {
		t.Fatalf("failed to create new stdin pipe: %v", err)
	}
	chldStdout, err := cmd.StdoutPipe()
	if err != nil {
		t.Fatalf("failed to create new stdout pipe: %v", err)
	}
	stderr := new(strings.Builder)
	cmd.Stderr = stderr

	err = cmd.Start()
	defer func() {