39 lines
865 B
Go
39 lines
865 B
Go
// +build darwin freebsd netbsd openbsd
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// +build !cgo
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package loadavg
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import (
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"fmt"
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"unsafe"
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"golang.org/x/sys/unix"
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)
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func get() (*Stats, error) {
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ret, err := unix.SysctlRaw("vm.loadavg")
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if err != nil {
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return nil, fmt.Errorf("failed in sysctl vm.loadavg: %s", err)
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}
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return collectLoadavgStats(ret)
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}
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// loadavg in sys/sysctl.h
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type loadStruct struct {
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Ldavg [3]uint32
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Fscale uint64
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}
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// Reference: sys/sysctl.h
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func collectLoadavgStats(out []byte) (*Stats, error) {
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if len(out) != 24 {
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return nil, fmt.Errorf("unexpected output of sysctl vm.loadavg: %v (len: %d)", out, len(out))
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}
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load := *(*loadStruct)(unsafe.Pointer(&out[0]))
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return &Stats{
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Loadavg1: float64(load.Ldavg[0]) / float64(load.Fscale),
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Loadavg5: float64(load.Ldavg[1]) / float64(load.Fscale),
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Loadavg15: float64(load.Ldavg[2]) / float64(load.Fscale),
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}, nil
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}
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