module PhusionPassenger::AdminTools

def self.process_is_alive?(pid)
  begin
    Process.kill(0, pid)
    return true
  rescue Errno::ESRCH
    return false
  rescue SystemCallError => e
    return true
  end
end

def self.tmpdir
  ["PASSENGER_INSTANCE_REGISTRY_DIR", "TMPDIR"].each do |name|
    if ENV.has_key?(name) && !ENV[name].empty?
      return ENV[name]
    end
  end
  return "/tmp"
end