From: merch-redmine@... Date: 2021-03-06T00:52:42+00:00 Subject: [ruby-core:102758] [Ruby master Bug#10203] TCPServer.new has strange behaviour when EADDRINUSE without specifying hostname Issue #10203 has been updated by jeremyevans0 (Jeremy Evans). Status changed from Feedback to Closed I think this is not a bug and can be closed. `TCPServer.new` using first `getaddrinfo` address that works is reasonable behavior if no address is specified. If you require a specific address, you should specify it. As @akr mentioned, `Socket.tcp_server_sockets` is a better way to handle the situation if you want to listen on both IPv4 and IPv6 addresses. ---------------------------------------- Bug #10203: TCPServer.new has strange behaviour when EADDRINUSE without specifying hostname https://bugs.ruby-lang.org/issues/10203#change-90771 * Author: lucas (Lucas Nussbaum) * Status: Closed * Priority: Normal * ruby -v: ruby 2.1.2p95 * Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN ---------------------------------------- after: irb(main):003:0> TCPServer::new(10001) => # I get irb listening to port 10001 using IPv4, but not IPv6: tcp 0 0 0.0.0.0:10001 0.0.0.0:* LISTEN 1000 376068 24437/irb a second creation also works, but only binds the IPv6 address: irb(main):004:0> TCPServer::new(10001) => # tcp6 0 0 :::10001 :::* LISTEN 1000 376098 24437/irb => I would have expected the first creation to bind to both IPv4 and IPv6, not just IPv4, and the second attempt to fail. Trying once again, the creation fails with a strange exception: irb(main):007:0> TCPServer::new(10001) TypeError: no implicit conversion of nil into String from (irb):7:in `initialize' from (irb):7:in `new' from (irb):7 from /usr/bin/irb:11:in `
' Binding explicitely to 0.0.0.0 avoids this: irb(main):005:0> TCPServer::new('0.0.0.0', 10002) => # irb(main):006:0> TCPServer::new('0.0.0.0', 10002) Errno::EADDRINUSE: Address already in use - bind(2) for "0.0.0.0" port 10002 from (irb):6:in `initialize' from (irb):6:in `new' from (irb):6 from /usr/bin/irb:11:in `
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