Get system load averages
#define _BSD_SOURCE /* See feature_test_macros(7) */ #include <stdlib.h> 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.
The getloadavg() function is thread-safe.
Not in POSIX.1-2001. Present on the BSDs and Solaris.
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