- Lots of code cleanups
    - Added write_pid function to auditd
    - Added audit_log to libaudit
    - Don't check file length in foreground mode of auditd
    - Added *if_enabled functions to send messages only if audit system is
        enabled
    - If syscall name is unknown when printing rules, use the syscall number
    - Rework the build system to produce singly threaded public libraries
    - Create a multithreaded version of libaudit for the audit daemon's use