Module: PassengerMonit::PidfileManager

Extended by:
PidfileManager
Included in:
PidfileManager
Defined in:
lib/passenger_monit/pidfile_manager.rb

Constant Summary collapse

BASENAME = 
'/var/tmp/rack.*.pid'

Instance Method Summary collapse

Instance Method Details

#remove_pid_file ⇒ Object 



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# File 'lib/passenger_monit/pidfile_manager.rb', line 32

def remove_pid_file
  pid = Process.pid
  go_over_pid_files do |file, saved_pid|
    if pid == saved_pid
      File.unlink(file)
      break
    end
  end
end

#write_pid_file ⇒ Object 



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# File 'lib/passenger_monit/pidfile_manager.rb', line 6

def write_pid_file
  pid = Process.pid
  count = 1
  pidfile = nil
  go_over_pid_files do |file, saved_pid|
    file_id = file[/(\d+)/,1].to_i
    # Increase counter only if we met the same file id
    count += 1 if file_id == count
    # We're already there
    return if saved_pid == pid
    # Check if the process is alive
    res = begin
      Process.kill(0, saved_pid)
    rescue Errno::ESRCH
      nil
    end
    # It's dead, reuse
    unless res
      pidfile = file
      break
    end
  end
  pidfile ||= BASENAME.sub('*', count.to_s)
  File.open(pidfile, 'w') {|f| f.write(pid.to_s)}
end