if errno != 0 {
		return errno
	}
	return nil
}

//go:cgo_import_dynamic libc_ptsname_r ptsname_r "/usr/lib/libSystem.B.dylib"
func libc_ptsname_r_trampoline()

func Ptsname(fd int) (string, error) {
	buf := make([]byte, 256)
	_, _, errno := syscall_syscall6(abi.FuncPCABI0(libc_ptsname_r_trampoline),
		uintptr(fd),
		uintptr(unsafe.Pointer(&buf[0])),

		return nil, "", ptyError("grantpt", err)
	}
	if err := unix.Unlockpt(m); err != nil {
		syscall.Close(m)
		return nil, "", ptyError("unlockpt", err)
	}
	processTTY, err = unix.Ptsname(m)
	if err != nil {
		syscall.Close(m)
		return nil, "", ptyError("ptsname", err)
	}
	return os.NewFile(uintptr(m), "pty"), processTTY, nil

		C.close(m)
		return nil, "", ptyError("grantpt", err)
	}
	if res, err := C.unlockpt(m); res < 0 {
		C.close(m)
		return nil, "", ptyError("unlockpt", err)
	}
	processTTY = C.GoString(C.ptsname(m))
	return os.NewFile(uintptr(m), "pty"), processTTY, nil

//sys   Select(nmsgsfds int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (ret int, err error) = SYS_SELECT
//sysnb Uname(buf *Utsname) (err error) = SYS_____OSNAME_A
//sys   Unshare(flags int) (err error) = SYS_UNSHARE

func Ptsname(fd int) (name string, err error) {
	runtime.EnterSyscall()
	r0, e2, e1 := CallLeFuncWithPtrReturn(GetZosLibVec()+SYS___PTSNAME_A<<4, uintptr(fd))
	runtime.ExitSyscall()
	if r0 == 0 {
		err = errnoErr2(e1, e2)