OPTIONAL
SYNOPSIS
        int * rusage(void)

DESCRIPTION
        Return an array with current system resource usage statistics,
        as returned by the getrusage(2) of Unix.
        namely: utime, stime, maxrss, rus.ru_ixrss, rus.ru_idrss,
                rus.ru_isrss, rus.ru_minflt, rus.ru_majflt, rus.ru_nswap,
                rus.ru_inblock, rus.ru_oublock, rus.ru_msgsnd,
                rus.ru_msgrcv, rus.ru_nsignals, rus.ru_nvcsw,
                rus.ru_nivcsw

        This function is optional.

SEE ALSO
        <sys/resource.h>(Unix)