You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: pty_openbsd.go
    path of file: ./repos/lazygit/vendor/github.com/creack/pty
    
    the code of the file until where you have to start completion: package pty

import (
	"os"
	"syscall"
	"unsafe"
)

func open() (pty, tty *os.File, err error) {
	/*
	 * from ptm(4):
	 * The PTMGET command allocates a free pseudo terminal, changes its
	 * ownership to the caller, revokes the access privileges for all previous
	 * users, opens the file descriptors for the pty and tty devices and
	 * returns them to the caller in struct ptmget.
	 */

	p, err := os.OpenFile("/dev/ptm", os.O_RDWR|syscall.O_CLOEXEC, 0)
	if err != nil {
		return
    
func open() (pty, tty *os.File, err error) {
	/*
	 * from ptm(4):
	 * The PTMGET command allocates a free pseudo terminal, changes its
	 * ownership to the caller, revokes the access privileges for all previous
	 * users, opens the file descriptors for the pty and tty devices and
	 * returns them to the caller in struct ptmget.
	 */

	p, err := os.OpenFile("/dev/ptm", os.O_RDWR|syscall.O_CLOEXEC, 0)
	if err != nil {
		return nil, nil, err
	}
	defer p.Close()

	var ptm ptmget
	if err := ioctl(p.Fd(), uintptr(ioctl_PTMGET), uintptr(unsafe.Pointer(&ptm))); err != nil {
		return nil, nil, err
	}

	pty = os.NewFile(uintptr(ptm.Cfd), "/dev/ptm")
	tty = os.NewFile(uintptr(ptm.Sfd), "/dev/ptm")

	return pty, tty, nil
}