GETLOADAVG(3) BSD Library Functions Manual GETLOADAVG(3)
NAME getloadavg - get system load averages
SYNOPSIS #define _BSD_SOURCE #include <stdlib.h>
int getloadavg(double loadavg, int nelem);
DESCRIPTION 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.
DIAGNOSTICS If the load average was unobtainable, -1 is returned; otherwise, the num- ber of samples actually retrieved is returned.
SEE ALSO uptime(1), proc(5)
HISTORY The getloadavg() function appeared in 4.3BSD-Reno. This function is available in glibc since version 2.2.
CONFORMING TO Not in POSIX.1-2001. Present on the BSDs and Solaris.
4.3BSD June 4, 1993 4.3BSD