host[linux]: fix utmp struct on arm.

host/host_linux_arm.go

@@ -3,25 +3,40 @@
 
 package host
 
-type exitStatus struct {
-	Etermination int16 // Process termination status.
-	Eexit        int16 // Process exit status.
-}
-type timeval struct {
-	TvSec  uint32 // Seconds.
-	TvUsec uint32 // Microseconds.
-}
+const (
+	sizeofPtr      = 0x8
+	sizeofShort    = 0x2
+	sizeofInt      = 0x4
+	sizeofLong     = 0x8
+	sizeofLongLong = 0x8
+)
+
+type (
+	_C_short     int16
+	_C_int       int32
+	_C_long      int64
+	_C_long_long int64
+)
 
 type utmp struct {
-	Type    int16      // Type of login.
-	Pid     int32      // Process ID of login process.
-	Line    [32]byte   // Devicename.
-	ID      [4]byte    // Inittab ID.
-	User    [32]byte   // Username.
-	Host    [256]byte  // Hostname for remote login.
-	Exit    exitStatus // Exit status of a process marked
-	Session int32      // Session ID, used for windowing.
-	Tv      timeval    // Time entry was made.
-	AddrV6  [16]byte   // Internet address of remote host.
-	Unused  [20]byte   // Reserved for future use. // original is 20
+	Type              int16
+	Pad_cgo_0         [2]byte
+	Pid               int32
+	Line              [32]int8
+	Id                [4]int8
+	User              [32]int8
+	Host              [256]int8
+	Exit              exit_status
+	Session           int32
+	Tv                UtTv
+	Addr_v6           [4]int32
+	X__glibc_reserved [20]int8
+}
+type exit_status struct {
+	Termination int16
+	Exit        int16
+}
+type UtTv struct {
+	TvSec  int32
+	TvUsec int32
 }