fix cpu_openbsd.go once and for all

cpu/cpu_openbsd.go

@@ -4,141 +4,99 @@
 package cpu
 
 import (
-	"bytes"
 	"context"
-	"encoding/binary"
 	"fmt"
 	"runtime"
-	"strconv"
-	"strings"
-	"syscall"
+	"unsafe"
 
 	"github.com/shirou/gopsutil/v3/internal/common"
 	"github.com/tklauser/go-sysconf"
 	"golang.org/x/sys/unix"
 )
 
-// sys/sched.h
-var (
-	CPUser    = 0
-	cpNice    = 1
-	cpSys     = 2
-	cpIntr    = 3
-	cpIdle    = 4
-	cpUStates = 5
-)
-
-// sys/sysctl.h
 const (
-	ctlKern     = 1  // "high kernel": proc, limits
-	ctlHw       = 6  // CTL_HW
-	sMT         = 24 // HW_sMT
-	kernCptime  = 40 // KERN_CPTIME
-	kernCptime2 = 71 // KERN_CPTIME2
+	// sys/sched.h
+	cpuOnline = 0x0001 // CPUSTATS_ONLINE
+
+	// sys/sysctl.h
+	ctlKern      = 1  // "high kernel": proc, limits
+	ctlHw        = 6  // CTL_HW
+	smt          = 24 // HW_SMT
+	kernCpTime   = 40 // KERN_CPTIME
+	kernCPUStats = 85 // KERN_CPUSTATS
 )
 
 var ClocksPerSec = float64(128)
 
+type cpuStats struct {
+	// cs_time[CPUSTATES]
+	User uint64
+	Nice uint64
+	Sys  uint64
+	Spin uint64
+	Intr uint64
+	Idle uint64
+
+	// cs_flags
+	Flags uint64
+}
+
 func init() {
 	clkTck, err := sysconf.Sysconf(sysconf.SC_CLK_TCK)
 	// ignore errors
 	if err == nil {
 		ClocksPerSec = float64(clkTck)
 	}
-
-	func() {
-		v, err := unix.Sysctl("kern.osrelease") // can't reuse host.PlatformInformation because of circular import
-		if err != nil {
-			return
-		}
-		v = strings.ToLower(v)
-		version, err := strconv.ParseFloat(v, 64)
-		if err != nil {
-			return
-		}
-		if version >= 6.4 {
-			cpIntr = 4
-			cpIdle = 5
-			cpUStates = 6
-		}
-	}()
-}
-
-func smt() (bool, error) {
-	mib := []int32{ctlHw, sMT}
-	buf, _, err := common.CallSyscall(mib)
-	if err != nil {
-		return false, err
-	}
-
-	var ret bool
-	br := bytes.NewReader(buf)
-	if err := binary.Read(br, binary.LittleEndian, &ret); err != nil {
-		return false, err
-	}
-
-	return ret, nil
 }
 
 func Times(percpu bool) ([]TimesStat, error) {
 	return TimesWithContext(context.Background(), percpu)
 }
 
-func TimesWithContext(ctx context.Context, percpu bool) ([]TimesStat, error) {
-	var ret []TimesStat
-
-	var ncpu int
-	if percpu {
-		ncpu, _ = Counts(true)
-	} else {
-		ncpu = 1
+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) / ClocksPerSec,
+			Nice:   float64(times.Nice) / ClocksPerSec,
+			System: float64(times.Sys) / ClocksPerSec,
+			Idle:   float64(times.Idle) / ClocksPerSec,
+			Irq:    float64(times.Intr) / ClocksPerSec,
+		}
+		return []TimesStat{stat}, nil
 	}
 
-	smt, err := smt()
-	if err == syscall.EOPNOTSUPP {
-		// if hw.smt is not applicable for this platform (e.g. i386),
-		// pretend it's enabled
-		smt = true
-	} else if err != nil {
-		return nil, err
+	ncpu, err := unix.SysctlUint32("hw.ncpu")
+	if err != nil {
+		return
 	}
 
-	for i := 0; i < ncpu; i++ {
-		j := i
-		if !smt {
-			j *= 2
-		}
-
-		cpuTimes := make([]int32, cpUStates)
-		var mib []int32
-		if percpu {
-			mib = []int32{ctlKern, kernCptime2, int32(j)}
-		} else {
-			mib = []int32{ctlKern, kernCptime}
-		}
+	var i uint32
+	for i = 0; i < ncpu; i++ {
+		mib := []int32{ctlKern, kernCPUStats, int32(i)}
 		buf, _, err := common.CallSyscall(mib)
 		if err != nil {
 			return ret, err
 		}
 
-		br := bytes.NewReader(buf)
-		err = binary.Read(br, binary.LittleEndian, &cpuTimes)
-		if err != nil {
-			return ret, err
-		}
-		c := TimesStat{
-			User:   float64(cpuTimes[CPUser]) / ClocksPerSec,
-			Nice:   float64(cpuTimes[cpNice]) / ClocksPerSec,
-			System: float64(cpuTimes[cpSys]) / ClocksPerSec,
-			Idle:   float64(cpuTimes[cpIdle]) / ClocksPerSec,
-			Irq:    float64(cpuTimes[cpIntr]) / ClocksPerSec,
-		}
-		if percpu {
-			c.CPU = fmt.Sprintf("cpu%d", j)
-		} else {
-			c.CPU = "cpu-total"
+		stats := (*cpuStats)(unsafe.Pointer(&buf[0]))
+		if (stats.Flags & cpuOnline) == 0 {
+			continue
 		}
-		ret = append(ret, c)
+		ret = append(ret, TimesStat{
+			CPU:    fmt.Sprintf("cpu%d", i),
+			User:   float64(stats.User) / ClocksPerSec,
+			Nice:   float64(stats.Nice) / ClocksPerSec,
+			System: float64(stats.Sys) / ClocksPerSec,
+			Idle:   float64(stats.Idle) / ClocksPerSec,
+			Irq:    float64(stats.Intr) / ClocksPerSec,
+		})
 	}
 
 	return ret, nil

cpu/cpu_openbsd_386.go

@@ -0,0 +1,10 @@
+package cpu
+
+type cpuTimes struct {
+	User uint32
+	Nice uint32
+	Sys  uint32
+	Spin uint32
+	Intr uint32
+	Idle uint32
+}

cpu/cpu_openbsd_amd64.go

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