func (p *Process) release() error {
	// Drop the Process' reference and mark handle unusable for
	// future calls.
	//
	// The API on Windows expects EINVAL if Release is called multiple
	// times.
	if old := p.handlePersistentRelease(statusReleased); old == statusReleased {
		return syscall.EINVAL
	}

	// no need for a finalizer anymore
	runtime.SetFinalizer(p, nil)
	return nil
}

func (p *Process) closeHandle() {

func (c *UnixConn) SyscallConn() (syscall.RawConn, error) {
	if !c.ok() {
		return nil, syscall.EINVAL
	}
	return newRawConn(c.fd), nil
}

// CloseRead shuts down the reading side of the Unix domain connection.
// Most callers should just use Close.
func (c *UnixConn) CloseRead() error {
	if !c.ok() {
		return syscall.EINVAL
	}
	if err := c.fd.closeRead(); err != nil {

// integer array of open file descriptors from another process.
func ParseUnixRights(m *SocketControlMessage) ([]int, error) {
	if m.Header.Level != SOL_SOCKET {
		return nil, EINVAL
	}
	if m.Header.Type != SCM_RIGHTS {
		return nil, EINVAL
	}
	fds := make([]int, len(m.Data)>>2)
	for i, j := 0, 0; i < len(m.Data); i += 4 {
		fds[j] = int(*(*int32)(unsafe.Pointer(&m.Data[i])))
		j++
	}
	return fds, nil

	if !fd.ok() {
		return syscall.EINVAL
	}
	return syscall.EPLAN9
}

func (fd *netFD) closeWrite() error {
	if !fd.ok() {
		return syscall.EINVAL
	}
	return syscall.EPLAN9
}

func (fd *netFD) Close() error {
	if err := fd.pfd.Close(); err != nil {
		return err
	}
	if !fd.ok() {
		return syscall.EINVAL
	}
	if fd.net == "tcp" {
		// The following line is required to unblock Reads.

// location, it returns (nil, EINVAL).
func ByteSliceFromString(s string) ([]byte, error) {
	if strings.IndexByte(s, 0) != -1 {
		return nil, EINVAL
	}
	a := make([]byte, len(s)+1)
	copy(a, s)
	return a, nil
}

// BytePtrFromString returns a pointer to a NUL-terminated array of
// bytes containing the text of s. If s contains a NUL byte at any
// location, it returns (nil, EINVAL).

		return nil, err
	}
	lsanl, ok := lsa.(*SockaddrNetlink)
	if !ok {
		return nil, EINVAL
	}
	var tab []byte

	rbNew := pageBufPool.Get().(*[]byte)
	defer pageBufPool.Put(rbNew)
done:
	for {
		rb := *rbNew
		nr, _, err := Recvfrom(s, rb, 0)
		if err != nil {
			return nil, err
		}
		if nr < NLMSG_HDRLEN {
			return nil, EINVAL
		}
		rb = rb[:nr]
		tab = append(tab, rb...)

	// this call can fail with EAGAIN because it's best-effort.
	// Also, when it returns an error, it's only for the last
	// huge page in the region requested.
	//
	// It can also sometimes return EINVAL if the corresponding
	// region hasn't been backed by physical memory. This is
	// difficult to guarantee in general, and it also means
	// there's no way to distinguish whether this syscall is
	// actually available. Oops.

	EFAULT          Errno = 21
	EFBIG           Errno = 22
	EHOSTUNREACH    Errno = 23
	EIDRM           Errno = 24
	EILSEQ          Errno = 25
	EINPROGRESS     Errno = 26
	EINTR           Errno = 27
	EINVAL          Errno = 28
	EIO             Errno = 29
	EISCONN         Errno = 30
	EISDIR          Errno = 31
	ELOOP           Errno = 32
	EMFILE          Errno = 33
	EMLINK          Errno = 34
	EMSGSIZE        Errno = 35

		rl.Cur = rlimInf32
	} else if rlim.Cur < uint64(rlimInf32) {
		rl.Cur = uint32(rlim.Cur)
	} else {
		return EINVAL
	}
	if rlim.Max == rlimInf64 {
		rl.Max = rlimInf32
	} else if rlim.Max < uint64(rlimInf32) {
		rl.Max = uint32(rlim.Max)
	} else {
		return EINVAL
	}

	return setrlimit1(resource, &rl)
}

//go:nosplit
func rawSetrlimit(resource int, rlim *Rlimit) Errno {

	}
}

// Test that error values are negative.
// Use a misaligned pointer to get -EINVAL.
func TestMincoreErrorSign(t *testing.T) {
	var dst byte
	v := Mincore(unsafe.Add(unsafe.Pointer(new(int32)), 1), 1, &dst)

	const EINVAL = 0x16
	if v != -EINVAL {
		t.Errorf("mincore = %v, want %v", v, -EINVAL)
	}
}

func TestKernelStructSize(t *testing.T) {