Issue #13409 has been updated by ioquatix (Samuel Williams).


On linux I get the following output for the 2nd example:

~~~
Server waiting for packet...
Sending data to #<Addrinfo: [::1]:6778 UDP (localhost)>
-:25:in `send': Address family not supported by protocol - send(2) (Errno::EAFNOSUPPORT)
	from -:25:in `block in <main>'
~~~


----------------------------------------
Bug #13409: UDPSocket#send breaks when using sockaddr
https://bugs.ruby-lang.org/issues/13409#change-64113

* Author: ioquatix (Samuel Williams)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.4.0
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
Here is the working example.

~~~
#!/usr/bin/env ruby

require 'socket'

port = 6778

server = UDPSocket.new.tap{|socket| socket.bind("localhost", port)}
client = UDPSocket.new

data = "Matz is nice so we are nice."

t1 = Thread.new do
    packet, (_, remote_port, remote_host) = server.recvfrom(512)
    server.send(packet, 0, remote_host, remote_port)
end

t2 = Thread.new do
    client.send(data, 0, "localhost", port)

    response, _ = client.recvfrom(512)

    puts "Got response: #{response.inspect}"
end

[t1, t2].each(&:join)

puts "Finished."
~~~

Here is one that fails with EINVAL:

~~~
#!/usr/bin/env ruby

Thread.abort_on_exception = true

require 'socket'

port = 6778

server = UDPSocket.new.tap{|socket| socket.bind("localhost", port)}
client = UDPSocket.new

data = "Matz is nice so we are nice."

t1 = Thread.new do
    puts "Server waiting for packet..."
    packet, (_, remote_port, remote_host) = server.recvfrom(512)
    server.send(packet, 0, remote_host, remote_port)
end

t2 = Thread.new do
    address = Addrinfo.udp("localhost", port)

    puts "Sending data to #{address.inspect}"
    # Should call ssize_t sendto(int sockfd, const void *buf, size_t len, int flags, const struct sockaddr *dest_addr, socklen_t addrlen), but calls send which fails with EINVAL.
    result = client.send(data, 0, address.to_sockaddr)

    response, _ = client.recvfrom(512)

    puts "Got response: #{response.inspect}"
end

[t1, t2].each(&:join)

puts "Finished."
~~~




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