getloadavg - get system load averages
The getloadavg() function returns the number of
processes in the system run queue averaged over various periods of time.
nelem samples are retrieved and assigned to successive
loadavg. The system imposes a maximum of 3
samples, representing averages over the last 1, 5, and 15 minutes,
If the load average was unobtainable, -1 is returned; otherwise, the number of samples actually retrieved is returned.
This function is available in glibc since version 2.2.
Not in POSIX.1. Present on the BSDs and Solaris.
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