[host]freebsd: update freebsd_amd64

host/host_freebsd.go

@@ -101,13 +101,11 @@ func Users() ([]UserStat, error) {
 		return ret, err
 	}
 
-	u := Utmpx{}
-	entrySize := int(unsafe.Sizeof(u)) - 3
-	entrySize = 197 // TODO: why should 197
+	entrySize := sizeOfUtmpx
 	count := len(buf) / entrySize
 
 	for i := 0; i < count; i++ {
-		b := buf[i*entrySize : i*entrySize+entrySize]
+		b := buf[i*sizeOfUtmpx : (i+1)*sizeOfUtmpx]
 		var u Utmpx
 		br := bytes.NewReader(b)
 		err := binary.Read(br, binary.LittleEndian, &u)

host/host_freebsd_amd64.go

@@ -9,6 +9,7 @@ const (
 	sizeofInt      = 0x4
 	sizeofLong     = 0x8
 	sizeofLongLong = 0x8
+	sizeOfUtmpx    = 197 // TODO: why should 197, not 0x118
 )
 
 type (
@@ -24,17 +25,19 @@ type Utmp struct {
 	Host [16]int8
 	Time int32
 }
+
 type Utmpx struct {
 	Type int16
 	Tv   Timeval
-	ID   [8]int8
+	Id   [8]int8
 	Pid  int32
 	User [32]int8
 	Line [16]int8
 	Host [125]int8
-	//	Host [128]int8
-	//	X__ut_spare [64]int8
+	//      Host [128]int8
+	//      X__ut_spare [64]int8
 }
+
 type Timeval struct {
 	Sec  [4]byte
 	Usec [3]byte

host/types_freebsd.go

@@ -27,6 +27,7 @@ const (
 	sizeofInt      = C.sizeof_int
 	sizeofLong     = C.sizeof_long
 	sizeofLongLong = C.sizeof_longlong
+	sizeOfUtmpx    = C.sizeof_struct_utmpx
 )
 
 // Basic types