Initial support for NetBSD.

Currently the changes are all copied from shirou/gopsutil#1364

cpu/cpu_netbsd.go

@@ -0,0 +1,127 @@
+//go:build openbsd
+// +build openbsd
+
+package cpu
+
+import (
+	"context"
+	"fmt"
+	"runtime"
+	"unsafe"
+
+	"github.com/shirou/gopsutil/v3/internal/common"
+	"github.com/tklauser/go-sysconf"
+	"golang.org/x/sys/unix"
+)
+
+type cpuTimes struct {
+    User uint64
+	Nice uint64
+	Sys  uint64
+    Intr uint64
+	Idle uint64
+}
+
+const (
+	// sys/sysctl.h
+	ctlKern      = 1  // "high kernel": proc, limits
+	ctlHw        = 6  // CTL_HW
+	kernCpTime   = 51 // KERN_CPTIME
+)
+
+var ClocksPerSec = float64(100)
+
+func init() {
+	clkTck, err := sysconf.Sysconf(sysconf.SC_CLK_TCK)
+	// ignore errors
+	if err == nil {
+		ClocksPerSec = float64(clkTck)
+	}
+}
+
+func Times(percpu bool) ([]TimesStat, error) {
+	return TimesWithContext(context.Background(), percpu)
+}
+
+func TimesWithContext(ctx context.Context, percpu bool) (ret []TimesStat, err error) {
+	if !percpu {
+		mib := []int32{ctlKern, kernCpTime}
+		buf, _, err := common.CallSyscall(mib)
+		if err != nil {
+			return ret, err
+		}
+		times := (*cpuTimes)(unsafe.Pointer(&buf[0]))
+		stat := TimesStat{
+			CPU:    "cpu-total",
+			User:   float64(times.User),
+			Nice:   float64(times.Nice),
+			System: float64(times.Sys),
+			Idle:   float64(times.Idle),
+			Irq:    float64(times.Intr),
+		}
+		return []TimesStat{stat}, nil
+	}
+
+	ncpu, err := unix.SysctlUint32("hw.ncpu")
+	if err != nil {
+		return
+	}
+
+	var i uint32
+	for i = 0; i < ncpu; i++ {
+		mib := []int32{ctlKern, kernCpTime, int32(i)}
+		buf, _, err := common.CallSyscall(mib)
+		if err != nil {
+			return ret, err
+		}
+
+        stats := (*cpuTimes)(unsafe.Pointer(&buf[0]))
+		ret = append(ret, TimesStat{
+			CPU:    fmt.Sprintf("cpu%d", i),
+			User:   float64(stats.User),
+			Nice:   float64(stats.Nice),
+			System: float64(stats.Sys),
+			Idle:   float64(stats.Idle),
+			Irq:    float64(stats.Intr),
+		})
+	}
+
+	return ret, nil
+}
+
+// Returns only one (minimal) CPUInfoStat on OpenBSD
+func Info() ([]InfoStat, error) {
+	return InfoWithContext(context.Background())
+}
+
+func InfoWithContext(ctx context.Context) ([]InfoStat, error) {
+	var ret []InfoStat
+	var err error
+
+	c := InfoStat{}
+
+	mhz, err := unix.Sysctl("machdep.dmi.processor-frequency")
+	if err != nil {
+		return nil, err
+	}
+    _, err = fmt.Sscanf(mhz, "%f", &c.Mhz)
+	if err != nil {
+		return nil, err
+	}
+
+	ncpu, err := unix.SysctlUint32("hw.ncpuonline")
+	if err != nil {
+		return nil, err
+	}
+	c.Cores = int32(ncpu)
+
+	if c.ModelName, err = unix.Sysctl("machdep.dmi.processor-version"); err != nil {
+		return nil, err
+	}
+
+	return append(ret, c), nil
+}
+
+func CountsWithContext(ctx context.Context, logical bool) (int, error) {
+	return runtime.NumCPU(), nil
+}

cpu/cpu_netbsd_arm64.go

@@ -0,0 +1,10 @@
+package cpu
+
+type cpuTimes struct {
+	User uint64
+	Nice uint64
+	Sys  uint64
+	Spin uint64
+	Intr uint64
+	Idle uint64
+}