Specify Celluloid::IO::UDPSocket#recvfrom to flags=0

[tricknotes]

This is a workaround for behavior change against Celluloid::IO with Ruby 2.3.
see also: celluloid/celluloid-io#163

[tricknotes]

This commit will fix some tests, but there is a failing test on Ruby 2.3.

E, [2015-12-31T03:36:26.560601 #5714] ERROR -- : Actor crashed!
RuntimeError: can't modify frozen String
    /Users/tricknotes/.rbenv/versions/2.3.0-dev/lib/ruby/2.3.0/resolv.rb:2463:in `block in create'
    /Users/tricknotes/.rbenv/versions/2.3.0-dev/lib/ruby/2.3.0/resolv.rb:2463:in `scan'
    /Users/tricknotes/.rbenv/versions/2.3.0-dev/lib/ruby/2.3.0/resolv.rb:2463:in `create'
    /Users/tricknotes/.rbenv/versions/2.3.0-dev/lib/ruby/gems/2.3.0/gems/celluloid-io-0.16.2/lib/celluloid/io/tcp_socket.rb:56:in `initialize'
    /Users/tricknotes/src/github.com/ioquatix/rubydns/lib/rubydns/resolver.rb:240:in `new'
    /Users/tricknotes/src/github.com/ioquatix/rubydns/lib/rubydns/resolver.rb:240:in `try_tcp_server'
    /Users/tricknotes/src/github.com/ioquatix/rubydns/lib/rubydns/resolver.rb:199:in `try_server'
    /Users/tricknotes/src/github.com/ioquatix/rubydns/lib/rubydns/resolver.rb:157:in `block (2 levels) in dispatch_request'
    /Users/tricknotes/.rbenv/versions/2.3.0-dev/lib/ruby/gems/2.3.0/gems/celluloid-0.16.0/lib/celluloid.rb:407:in `block in timeout'
    /Users/tricknotes/.rbenv/versions/2.3.0-dev/lib/ruby/gems/2.3.0/gems/celluloid-0.16.0/lib/celluloid/actor.rb:252:in `timeout'
    /Users/tricknotes/.rbenv/versions/2.3.0-dev/lib/ruby/gems/2.3.0/gems/celluloid-0.16.0/lib/celluloid.rb:406:in `timeout'
    /Users/tricknotes/src/github.com/ioquatix/rubydns/lib/rubydns/resolver.rb:156:in `block in dispatch_request'
    /Users/tricknotes/src/github.com/ioquatix/rubydns/lib/rubydns/resolver.rb:284:in `block in each'
    /Users/tricknotes/src/github.com/ioquatix/rubydns/lib/rubydns/resolver.rb:281:in `each'
    /Users/tricknotes/src/github.com/ioquatix/rubydns/lib/rubydns/resolver.rb:281:in `each'
    /Users/tricknotes/src/github.com/ioquatix/rubydns/lib/rubydns/resolver.rb:147:in `dispatch_request'
    /Users/tricknotes/src/github.com/ioquatix/rubydns/lib/rubydns/resolver.rb:93:in `query'
    /Users/tricknotes/.rbenv/versions/2.3.0-dev/lib/ruby/gems/2.3.0/gems/celluloid-0.16.0/lib/celluloid/calls.rb:26:in `public_send'
    /Users/tricknotes/.rbenv/versions/2.3.0-dev/lib/ruby/gems/2.3.0/gems/celluloid-0.16.0/lib/celluloid/calls.rb:26:in `dispatch'
    /Users/tricknotes/.rbenv/versions/2.3.0-dev/lib/ruby/gems/2.3.0/gems/celluloid-0.16.0/lib/celluloid/calls.rb:63:in `dispatch'
    /Users/tricknotes/.rbenv/versions/2.3.0-dev/lib/ruby/gems/2.3.0/gems/celluloid-0.16.0/lib/celluloid/cell.rb:60:in `block in invoke'
    /Users/tricknotes/.rbenv/versions/2.3.0-dev/lib/ruby/gems/2.3.0/gems/celluloid-0.16.0/lib/celluloid/cell.rb:71:in `block in task'
    /Users/tricknotes/.rbenv/versions/2.3.0-dev/lib/ruby/gems/2.3.0/gems/celluloid-0.16.0/lib/celluloid/actor.rb:357:in `block in task'
    /Users/tricknotes/.rbenv/versions/2.3.0-dev/lib/ruby/gems/2.3.0/gems/celluloid-0.16.0/lib/celluloid/tasks.rb:57:in `block in initialize'
    /Users/tricknotes/.rbenv/versions/2.3.0-dev/lib/ruby/gems/2.3.0/gems/celluloid-0.16.0/lib/celluloid/tasks/task_fiber.rb:15:in `block in create'

However this is a Ruby's bug and it is fixed on trunk.

[ioquatix]

Looks fine, but we should revert once Celluloid::IO releases a fixed version.

[ioquatix]

It seems like 2.3.0 is a bit of a borked release? Perhaps we should skip 2.3.0 and wait for 2.3.1?

[tricknotes]

I think so too :<

[ioquatix]

maybe they will do a patch release which fixes this broken behaviour? or is it slated for 2.3.1?