Ruby守護程序中的錯誤文件描述符

Question

在Mac OS X Lion上使用Ruby v1.8.7和Daemons v1.1.8，我試圖編寫一個消費者進程並讓它作為dameon運行：

# config[:name] => 'idx_my_delete_consumer'
# config[:daemon] => {:multiple => false,
#                    :backtrace => true, 
#                    :dir_mode => :normal, 
#                    :log_dir => '/Users/pprakash/consumer.log',
#                    :monitor => true,
#                    :dir => '/Users/pprakash/pids'}

 Daemons.run_proc(config[:name], config[:daemon]) do
    consumer = MyConsumer.new(config)  
    consumer.subscribe
  end

但是，它沒有啟動，而是拋出一個很長的回溯，這是這樣的：

E, [2012-05-28T19:34:16.199770 #29357] ERROR -- : Bad file descriptor (Errno::EBADF)
/opt/local/lib/ruby/gems/1.8/gems/daemons-1.1.8/lib/daemons/daemonize.rb:134:in `for_fd'
/opt/local/lib/ruby/gems/1.8/gems/daemons-1.1.8/lib/daemons/daemonize.rb:134:in `close_io'
/opt/local/lib/ruby/gems/1.8/gems/daemons-1.1.8/lib/daemons/daemonize.rb:134:in `initialize'
/opt/local/lib/ruby/gems/1.8/gems/daemons-1.1.8/lib/daemons/daemonize.rb:134:in `new'
/opt/local/lib/ruby/gems/1.8/gems/daemons-1.1.8/lib/daemons/daemonize.rb:134:in `close_io'
/opt/local/lib/ruby/gems/1.8/gems/daemons-1.1.8/lib/daemons/daemonize.rb:75:in `call_as_daemon'
/opt/local/lib/ruby/gems/1.8/gems/daemons-1.1.8/lib/daemons/application.rb:258:in `start_proc'
/opt/local/lib/ruby/gems/1.8/gems/daemons-1.1.8/lib/daemons/application.rb:295:in `start'
/opt/local/lib/ruby/gems/1.8/gems/daemons-1.1.8/lib/daemons/monitor.rb:51:in `watch'
/opt/local/lib/ruby/gems/1.8/gems/daemons-1.1.8/lib/daemons/monitor.rb:51:in `fork'
/opt/local/lib/ruby/gems/1.8/gems/daemons-1.1.8/lib/daemons/monitor.rb:51:in `watch'
/opt/local/lib/ruby/gems/1.8/gems/daemons-1.1.8/lib/daemons/monitor.rb:45:in `each'
/opt/local/lib/ruby/gems/1.8/gems/daemons-1.1.8/lib/daemons/monitor.rb:45:in `watch'
/opt/local/lib/ruby/gems/1.8/gems/daemons-1.1.8/lib/daemons/monitor.rb:44:in `loop'
/opt/local/lib/ruby/gems/1.8/gems/daemons-1.1.8/lib/daemons/monitor.rb:44:in `watch'
/opt/local/lib/ruby/gems/1.8/gems/daemons-1.1.8/lib/daemons/monitor.rb:84:in `start_with_pidfile'
/opt/local/lib/ruby/gems/1.8/gems/daemons-1.1.8/lib/daemons/monitor.rb:64:in `fork'
/opt/local/lib/ruby/gems/1.8/gems/daemons-1.1.8/lib/daemons/monitor.rb:64:in `start_with_pidfile'
/opt/local/lib/ruby/gems/1.8/gems/daemons-1.1.8/lib/daemons/monitor.rb:111:in `start'
/opt/local/lib/ruby/gems/1.8/gems/daemons-1.1.8/lib/daemons/application_group.rb:149:in `create_monitor'
/opt/local/lib/ruby/gems/1.8/gems/daemons-1.1.8/lib/daemons/application.rb:284:in `start'
/opt/local/lib/ruby/gems/1.8/gems/daemons-1.1.8/lib/daemons/controller.rb:70:in `run'
/opt/local/lib/ruby/gems/1.8/gems/daemons-1.1.8/lib/daemons.rb:197:in `run_proc'
/opt/local/lib/ruby/gems/1.8/gems/daemons-1.1.8/lib/daemons/cmdline.rb:109:in `call'
/opt/local/lib/ruby/gems/1.8/gems/daemons-1.1.8/lib/daemons/cmdline.rb:109:in `catch_exceptions'
/opt/local/lib/ruby/gems/1.8/gems/daemons-1.1.8/lib/daemons.rb:196:in `run_proc'
users/delete_consumer.rb:40

我不確定是什么導致了這個問題？ 目錄名，日志文件名都有效。 我能夠使用這些配置創建一個MyConsumer實例，並能夠從獨立程序/控制台正確執行其#subscribe。

Answer 1

根據我對Ruby Daemons的經驗，我發現這些錯誤表明底層塊（守護進程）包含錯誤。 修復這些錯誤也可以修復此錯誤。

Answer 2

您的示例中確實存在可能導致錯誤的拼寫錯誤。 檢查MyConsumer的拼寫，你轉換了s和n ...

consumer = MyCosnumer.new(config)