Using Ruby v1.8.7 and Daemons v1.1.8 on Mac OS X Lion, I am attempting to write a consumer process and get it run as a dameon:
# 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
However, it does not start and instead throws a long traceback, which goes something like this:
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
I am not sure what is causing this issue? The directory name, log file name are all valid. I am able to create an instance of MyConsumer with these config and able to execute its #subscribe properly from a standalone program/console.
Based on my experiences with Ruby Daemons, I found that such errors indicate that the underlying block (which is daemonized) contains errors. Fixing those errors fixes this error as well.