Ruby

def test_connect_timeout

host = "localhost"

server = TCPServer.new(host, 0)

port = server.addr[1]

serv_thread = Thread.new {server.accept}

sock = Socket.tcp(host, port, :connect_timeout => 30)

accepted = serv_thread.value

assert_kind_of TCPSocket, accepted

assert_equal sock, IO.select(nil, [ sock ])[1][0], "not writable"

sock.close

# some platforms may not timeout when the listener queue overflows,

# but we know Linux does with the default listen backlog of 5 for TCPServer

assert_raises(Errno::ETIMEDOUT) do

200.times do |i|

sock = Socket.tcp(host, port, :connect_timeout => 0)

assert_equal sock, IO.select(nil, [ sock ])[1][0],

"not writable (#{i})"

sock.close

end

end if RUBY_PLATFORM =~ /linux/

ensure

server.close

accepted.close if accepted

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

end