GETLOADAVG(3) Linux Programmers Manual GETLOADAVG(3)
getloadavg - get system load averages
int getloadavg(double loadavg, int nelem);
The getloadavg() function returns the number of processes in the system
run queue averaged over various periods of time. Up to nelem samples
are retrieved and assigned to successive elements of loadavg. The
system imposes a maximum of 3 samples, representing averages over the
last 1, 5, and 15 minutes, respectively.
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.1-2001. Present on the BSDs and Solaris.
uptime(1), proc(5), feature_test_macros(7)
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Linux 2007-12-08 GETLOADAVG(3)