return netfd, nil
}

// Defined in os package.
func newUnixFile(fd int, name string) *os.File

func (fd *netFD) dup() (f *os.File, err error) {
	ns, call, err := fd.pfd.Dup()
	if err != nil {
		if call != "" {
			err = os.NewSyscallError(call, err)
		}
		return nil, err
	}

	return newUnixFile(ns, fd.name()), nil

// the Fd method has returned a blocking descriptor, and we want to
// retain that behavior because existing code expects it and depends on it.
//
//go:linkname net_newUnixFile net.newUnixFile
func net_newUnixFile(fd int, name string) *File {
	if fd < 0 {
		panic("invalid FD")
	}

	return newFile(fd, name, kindSock, true)
}

// newFileKind describes the kind of file to newFile.