ERROR_NOT_FOUND           Errno = 1168
	ERROR_PRIVILEGE_NOT_HELD  Errno = 1314
	WSAEACCES                 Errno = 10013
	WSAENOPROTOOPT            Errno = 10042
	WSAECONNABORTED           Errno = 10053
	WSAECONNRESET             Errno = 10054
)

const (
	// Invented values to support what package os expects.
	O_RDONLY   = 0x00000
	O_WRONLY   = 0x00001
	O_RDWR     = 0x00002
	O_CREAT    = 0x00040
	O_EXCL     = 0x00080

		n, err := c.Read(b)
		if err == nil || err == io.EOF {
			return string(b[:n]), nil
		}
		errno, ok := toErrno(err)
		if ok && ignoreSomeReadErrors && (errno == syscall.ERROR_NETNAME_DELETED || errno == syscall.WSAECONNRESET) {
			return "", nil
		}
		return "", err
	}

	send := func(addr string, data string) error {
		c, err := Dial("tcp", addr)
		if err != nil {
			return err
		}
		defer c.Close()

			return syscall.InvalidHandle, nil, 0, "", err
		}

		errcall, err := fd.acceptOne(s, rawsa[:], o)
		if err == nil {
			return s, rawsa[:], uint32(o.rsan), "", nil
		}

		// Sometimes we see WSAECONNRESET and ERROR_NETNAME_DELETED is
		// returned here. These happen if connection reset is received
		// before AcceptEx could complete. These errors relate to new
		// connection, not to AcceptEx, so ignore broken connection and