# File lib/thin/daemonizing.rb, line 66
    def change_privilege(user, group=user)
      log_info "Changing process privilege to #{user}:#{group}"
      
      uid, gid = Process.euid, Process.egid
      target_uid = Etc.getpwnam(user).uid
      target_gid = Etc.getgrnam(group).gid

      if uid != target_uid || gid != target_gid
        # Change PID file ownership
        File.chown(target_uid, target_gid, @pid_file) if File.exists?(@pid_file)

        # Change process ownership
        Process.initgroups(user, target_gid)
        Process::GID.change_privilege(target_gid)
        Process::UID.change_privilege(target_uid)
      end
    rescue Errno::EPERM => e
      log_info "Couldn't change user and group to #{user}:#{group}: #{e}"
    end