# Receive `length` bytes of data from any sender
	#
	# On error, returns an empty string and sets `error` appropriately.
	fun recv(length: Int): String
	do
		var buf = new CString(length)
		var len = native.recvfrom(buf, length, 0, new NativeSocketAddrIn.nul)
		if len == -1 then
			error = new IOError.from_errno
			return ""
		end
		return buf.to_s_unsafe(len, copy=false)
	end