Issue #13407 has been updated by ioquatix (Samuel Williams).


Okay.

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."
~~~

----------------------------------------
Bug #13407: We have recv_nonblock but not send_nonblock... can we add it?
https://bugs.ruby-lang.org/issues/13407#change-64101

* Author: ioquatix (Samuel Williams)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
We have recv_nonblock, read_nonblock, write_nonblock but not BasicSocket#send_nonblock. Is this a mistake?



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