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 {

	if !c.ok() {
		return syscall.EINVAL
	}
	err := c.fd.pfd.RawControl(f)
	runtime.KeepAlive(c.fd)
	if err != nil {
		err = &OpError{Op: "raw-control", Net: c.fd.net, Source: nil, Addr: c.fd.laddr, Err: err}
	}
	return err
}

func (c *rawConn) Read(f func(uintptr) bool) error {
	if !c.ok() {
		return syscall.EINVAL
	}
	err := c.fd.pfd.RawRead(f)
	runtime.KeepAlive(c.fd)

func ParseUnixCredentials(m *SocketControlMessage) (*Ucred, error) {
	if m.Header.Level != SOL_SOCKET {
		return nil, EINVAL
	}
	if m.Header.Type != SCM_CREDENTIALS {
		return nil, EINVAL
	}
	if uintptr(len(m.Data)) < unsafe.Sizeof(Ucred{}) {
		return nil, EINVAL
	}
	ucred := *(*Ucred)(unsafe.Pointer(&m.Data[0]))
	return &ucred, nil

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

// ReadFromIP acts like ReadFrom but returns an IPAddr.
func (c *IPConn) ReadFromIP(b []byte) (int, *IPAddr, error) {
	if !c.ok() {
		return 0, nil, syscall.EINVAL
	}
	n, addr, err := c.readFrom(b)
	if err != nil {

	"syscall"
)

func (out *OutBuf) fallocate(size uint64) error {
	err := unix.PosixFallocate(int(out.f.Fd()), 0, int64(size))
	// ZFS on FreeBSD does not support posix_fallocate and returns EINVAL in that case.
	if err == syscall.EINVAL {
		return errNoFallocate
	}
	return err

		{&OpError{Op: "op", Err: &os.SyscallError{Syscall: "syscall", Err: syscall.EADDRNOTAVAIL}}, true},

		{syscall.EINVAL, false},
		{&os.SyscallError{Syscall: "syscall", Err: syscall.EINVAL}, false},
		{&OpError{Op: "op", Err: syscall.EINVAL}, false},
		{&OpError{Op: "op", Err: &os.SyscallError{Syscall: "syscall", Err: syscall.EINVAL}}, false},
	} {
		if ok := spuriousENOTAVAIL(tt.error); ok != tt.ok {

// Errno values.
var (
	errEAGAIN error = syscall.EAGAIN
	errEINVAL error = syscall.EINVAL
	errENOENT error = syscall.ENOENT
)

// errnoErr returns common boxed Errno values, to prevent
// allocations at runtime.
func errnoErr(e syscall.Errno) error {
	switch e {
	case 0:
		return nil
	case syscall.EAGAIN:
		return errEAGAIN
	case syscall.EINVAL:
		return errEINVAL
	case syscall.ENOENT:
		return errENOENT
	}
	return e

	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.

		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...)

	case AF_INET:
		if len(b) < SizeofSockaddrInet4 {
			return nil, EINVAL
		}
		rsa := (*RawSockaddrAny)(unsafe.Pointer(&b[0]))
		return anyToSockaddr(rsa)
	case AF_INET6:
		if len(b) < SizeofSockaddrInet6 {
			return nil, EINVAL
		}
		rsa := (*RawSockaddrAny)(unsafe.Pointer(&b[0]))
		return anyToSockaddr(rsa)
	default:
		return nil, EINVAL
	}
}

const (