Issue #9247 has been updated by nagachika (Tomoyuki Chikanaga). Assignee changed from nagachika (Tomoyuki Chikanaga) to usa (Usaku NAKAMURA) ---------------------------------------- Bug #9247: Bugs in socket.rb (exception retrieval) https://bugs.ruby-lang.org/issues/9247#change-43873 Author: ko1 (Koichi Sasada) Status: Assigned Priority: Normal Assignee: usa (Usaku NAKAMURA) Category: lib Target version: current: 2.1.0 ruby -v: ruby 2.1.0dev (2013-12-13 trunk 44170) [i386-mswin32_110] Backport: 1.9.3: REQUIRED, 2.0.0: DONE Ruby 2.1 (trunk) 2.0 and 1.9.3 both has a bug to retrieve exception. In the following code, opened socket is always closed. require 'socket' ai = Addrinfo.tcp(nil, 12345) begin raise rescue p ai.listen #=> #<Socket:(closed)> end This is because in socket.rb, there are such error handling code: # creates a listening socket bound to self. def listen(backlog=Socket::SOMAXCONN) sock = Socket.new(self.pfamily, self.socktype, self.protocol) begin sock.ipv6only! if self.ipv6? sock.setsockopt(:SOCKET, :REUSEADDR, 1) sock.bind(self) sock.listen(backlog) if block_given? yield sock else sock end ensure ### THIS LINE CLOSE `sock' every time when $! is not nil sock.close if !sock.closed? && (block_given? || $!) end end There are similar code in socket.rb. akr-san already knows this issue. This ticket is to note issues. We realize this issue because webrick use this feature from 2.1. The following code no longer works on 2.1. begin require 'xyzzy' # something like webrick rescue LoadError require 'webrick' server = WEBrick::HTTPServer.new(Port: 12345) end Because $! is an instance of LoadError. -- http://bugs.ruby-lang.org/