Ruby

def test_tcp_fastopen

port = random_port

serv = Socket.new(Socket::AF_INET, Socket::SOCK_STREAM)

serv.setsockopt(Socket::SOL_TCP, Socket::TCP_FASTOPEN, 5)

addrinfo = Addrinfo.new(Socket.sockaddr_in(port, "localhost"))

serv.bind(addrinfo)

serv.listen(1)

th = Thread.new do

sock, = serv.accept

begin

assert_equal("foo", sock.read)

ensure

sock.close if sock && !sock.closed?

end

end

sock = Socket.new(Socket::AF_INET, Socket::SOCK_STREAM)

len = sock.send("foo", Socket::MSG_FASTOPEN, Socket.sockaddr_in(port, "localhost"))

assert_equal(len, 3)

sock.close

assert(th.join(10))

ensure

th.kill if th

sock.close if sock && !sock.closed?

end if defined?(Socket::TCP_FASTOPEN) && defined?(Socket::MSG_FASTOPEN)