vendor/rails/activesupport/lib/active_support/core_ext/process/daemon.rb

   1 if RUBY_VERSION < "1.9"
   2   module Process
   3     def self.daemon(nochdir = nil, noclose = nil)
   4       exit if fork                     # Parent exits, child continues.
   5       Process.setsid                   # Become session leader.
   6       exit if fork                     # Zap session leader. See [1].
   7
   8       unless nochdir
   9         Dir.chdir "/"                  # Release old working directory.
  10       end
  11
  12       File.umask 0000                  # Ensure sensible umask. Adjust as needed.
  13
  14       unless noclose
  15         STDIN.reopen "/dev/null"       # Free file descriptors and
  16         STDOUT.reopen "/dev/null", "a" # point them somewhere sensible.
  17         STDERR.reopen '/dev/null', 'a'
  18       end
  19
  20       trap("TERM") { exit }
  21
  22       return 0
  23     end
  24   end
  25 end