host[freebsd]: change to use utmpx for 9.0 or later.

docker/docker_notlinux.go

@@ -5,7 +5,6 @@ package docker
 import (
 	"encoding/json"
 
-	"github.com/shirou/gopsutil/common"
 	"github.com/shirou/gopsutil/cpu"
 )
 

host/host_freebsd.go

@@ -77,9 +77,13 @@ func BootTime() (int64, error) {
 }
 
 func Users() ([]UserStat, error) {
-	utmpfile := "/var/run/utmp"
-	var ret []UserStat
+	utmpfile := "/var/run/utx.active"
+	if !common.PathExists(utmpfile) {
+		utmpfile = "/var/run/utmp" // before 9.0
+		return getUsersFromUtmp(utmpfile)
+	}
 
+	var ret []UserStat
 	file, err := os.Open(utmpfile)
 	if err != nil {
 		return ret, err
@@ -90,24 +94,25 @@ func Users() ([]UserStat, error) {
 		return ret, err
 	}
 
-	u := Utmp{}
-	entrySize := int(unsafe.Sizeof(u))
+	u := Utmpx{}
+	entrySize := int(unsafe.Sizeof(u)) - 3
+	entrySize = 197 // TODO: why should 197
 	count := len(buf) / entrySize
 
 	for i := 0; i < count; i++ {
 		b := buf[i*entrySize : i*entrySize+entrySize]
-
-		var u Utmp
+		var u Utmpx
 		br := bytes.NewReader(b)
 		err := binary.Read(br, binary.LittleEndian, &u)
-		if err != nil || u.Time == 0 {
+		if err != nil || u.Type != 4 {
 			continue
 		}
+		sec := (binary.LittleEndian.Uint32(u.Tv.Sec[:])) / 2 // TODO:
 		user := UserStat{
-			User:     common.IntToString(u.Name[:]),
+			User:     common.IntToString(u.User[:]),
 			Terminal: common.IntToString(u.Line[:]),
 			Host:     common.IntToString(u.Host[:]),
-			Started:  int(u.Time),
+			Started:  int(sec),
 		}
 
 		ret = append(ret, user)
@@ -141,3 +146,40 @@ func GetVirtualization() (string, string, error) {
 
 	return system, role, nil
 }
+
+// before 9.0
+func getUsersFromUtmp(utmpfile string) ([]UserStat, error) {
+	var ret []UserStat
+	file, err := os.Open(utmpfile)
+	if err != nil {
+		return ret, err
+	}
+	buf, err := ioutil.ReadAll(file)
+	if err != nil {
+		return ret, err
+	}
+
+	u := Utmp{}
+	entrySize := int(unsafe.Sizeof(u))
+	count := len(buf) / entrySize
+
+	for i := 0; i < count; i++ {
+		b := buf[i*entrySize : i*entrySize+entrySize]
+		var u Utmp
+		br := bytes.NewReader(b)
+		err := binary.Read(br, binary.LittleEndian, &u)
+		if err != nil || u.Time == 0 {
+			continue
+		}
+		user := UserStat{
+			User:     common.IntToString(u.Name[:]),
+			Terminal: common.IntToString(u.Line[:]),
+			Host:     common.IntToString(u.Host[:]),
+			Started:  int(u.Time),
+		}
+
+		ret = append(ret, user)
+	}
+
+	return ret, nil
+}

host/host_freebsd_amd64.go

@@ -1,7 +1,5 @@
-// +build freebsd
-// +build amd64
 // Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs host/types_freebsd.go
+// cgo -godefs types_freebsd.go
 
 package host
 
@@ -26,3 +24,18 @@ type Utmp struct {
 	Host [16]int8
 	Time int32
 }
+type Utmpx struct {
+	Type int16
+	Tv   Timeval
+	Id   [8]int8
+	Pid  int32
+	User [32]int8
+	Line [16]int8
+	Host [125]int8
+	//	Host [128]int8
+	//	X__ut_spare [64]int8
+}
+type Timeval struct {
+	Sec  [4]byte
+	Usec [3]byte
+}

host/types_freebsd.go

@@ -9,7 +9,8 @@ package host
 /*
 #define KERNEL
 #include <sys/types.h>
-#include <utmp.h>
+#include <sys/time.h>
+#include <utmpx.h>
 
 enum {
 	sizeofPtr = sizeof(void*),
@@ -38,3 +39,5 @@ type (
 )
 
 type Utmp C.struct_utmp
+type Utmpx C.struct_utmpx
+type Timeval C.struct_timeval