Module: Process

Defined in:
lib/core/facets/process/daemon.rb

Class Method Summary collapse

Class Method Details

.daemon(nochdir = nil, noclose = nil) ⇒ Object

Turns the current script into a daemon process that detaches from the console. It can be shut down with a TERM signal.

CREDIT: David Heinemeier Hansson



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# File 'lib/core/facets/process/daemon.rb', line 9

def self.daemon(nochdir=nil, noclose=nil)
  exit if fork # Parent exits, child continues.
  Process.setsid # Become session leader.
  exit if fork # Zap session leader. See [1].

  unless nochdir
    Dir.chdir "/" # Release old working directory.
  end

  File.umask 0000 # Ensure sensible umask. Adjust as needed.

  unless noclose
    STDIN.reopen "/dev/null" # Free file descriptors and
    STDOUT.reopen "/dev/null", "a" # point them somewhere sensible.
    STDERR.reopen '/dev/null', 'a'
  end

  trap("TERM") { exit }

  return 0
end