* data - max data size (KB)
   * fsize - maximum filesize (KB)
   * memlock - max locked-in-memory address space (KB)
   * nofile - max number of open files
   * rss - max resident set size (KB)
   * stack - max stack size (KB)
   * cpu - max CPU time (MIN)
   * nproc - max number of processes
   * as - address space limit
   * maxlogins - max number of logins for this user
   * maxsyslogins - max number of logins on the system
   * priority - the priority to run user process with
   * locks - max number of file locks the user can hold
   * sigpending - max number of pending signals
   * msgqueue - max memory used by POSIX message queues (bytes)
   * nice - max nice priority allowed to raise to
   * rtprio - max realtime priority
   * chroot - change root to directory (Debian-specific)