login: Assume that _HAVE_UT_* constants are true

Make the GNU version of bits/utmp.h the generic version because
all remaining ports use it (with a sysdeps override for
Linux s390/s390x).

bits/utmp.h

@@ -1,4 +1,4 @@
-/* The `struct utmp' type, describing entries in the utmp file.  Generic/BSDish
+/* The `struct utmp' type, describing entries in the utmp file.
    Copyright (C) 1993-2019 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -21,29 +21,106 @@
 #endif
 
 #include <paths.h>
-#include <time.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <bits/wordsize.h>
 
 
-#define	UT_NAMESIZE	8
-#define	UT_LINESIZE	8
-#define	UT_HOSTSIZE	16
+#define UT_LINESIZE	32
+#define UT_NAMESIZE	32
+#define UT_HOSTSIZE	256
 
 
+/* The structure describing an entry in the database of
+   previous logins.  */
 struct lastlog
   {
-    time_t ll_time;
+#if __WORDSIZE_TIME64_COMPAT32
+    int32_t ll_time;
+#else
+    __time_t ll_time;
+#endif
     char ll_line[UT_LINESIZE];
     char ll_host[UT_HOSTSIZE];
   };
 
-struct utmp
+
+/* The structure describing the status of a terminated process.  This
+   type is used in `struct utmp' below.  */
+struct exit_status
   {
-    char ut_line[UT_LINESIZE];
-    char ut_user[UT_NAMESIZE];
-#define ut_name ut_user
-    char ut_host[UT_HOSTSIZE];
-    long int ut_time;
+    short int e_termination;	/* Process termination status.  */
+    short int e_exit;		/* Process exit status.  */
   };
 
 
-#define _HAVE_UT_HOST 1		/* We have the ut_host field.  */
+/* The structure describing an entry in the user accounting database.  */
+struct utmp
+{
+  short int ut_type;		/* Type of login.  */
+  pid_t ut_pid;			/* Process ID of login process.  */
+  char ut_line[UT_LINESIZE]
+    __attribute_nonstring__;	/* Devicename.  */
+  char ut_id[4];		/* Inittab ID.  */
+  char ut_user[UT_NAMESIZE]
+    __attribute_nonstring__;	/* Username.  */
+  char ut_host[UT_HOSTSIZE]
+    __attribute_nonstring__;	/* Hostname for remote login.  */
+  struct exit_status ut_exit;	/* Exit status of a process marked
+				   as DEAD_PROCESS.  */
+/* The ut_session and ut_tv fields must be the same size when compiled
+   32- and 64-bit.  This allows data files and shared memory to be
+   shared between 32- and 64-bit applications.  */
+#if __WORDSIZE_TIME64_COMPAT32
+  int32_t ut_session;		/* Session ID, used for windowing.  */
+  struct
+  {
+    int32_t tv_sec;		/* Seconds.  */
+    int32_t tv_usec;		/* Microseconds.  */
+  } ut_tv;			/* Time entry was made.  */
+#else
+  long int ut_session;		/* Session ID, used for windowing.  */
+  struct timeval ut_tv;		/* Time entry was made.  */
+#endif
+
+  int32_t ut_addr_v6[4];	/* Internet address of remote host.  */
+  char __glibc_reserved[20];		/* Reserved for future use.  */
+};
+
+/* Backwards compatibility hacks.  */
+#define ut_name		ut_user
+#ifndef _NO_UT_TIME
+/* We have a problem here: `ut_time' is also used otherwise.  Define
+   _NO_UT_TIME if the compiler complains.  */
+# define ut_time	ut_tv.tv_sec
+#endif
+#define ut_xtime	ut_tv.tv_sec
+#define ut_addr		ut_addr_v6[0]
+
+
+/* Values for the `ut_type' field of a `struct utmp'.  */
+#define EMPTY		0	/* No valid user accounting information.  */
+
+#define RUN_LVL		1	/* The system's runlevel.  */
+#define BOOT_TIME	2	/* Time of system boot.  */
+#define NEW_TIME	3	/* Time after system clock changed.  */
+#define OLD_TIME	4	/* Time when system clock changed.  */
+
+#define INIT_PROCESS	5	/* Process spawned by the init process.  */
+#define LOGIN_PROCESS	6	/* Session leader of a logged in user.  */
+#define USER_PROCESS	7	/* Normal process.  */
+#define DEAD_PROCESS	8	/* Terminated process.  */
+
+#define ACCOUNTING	9
+
+/* Old Linux name for the EMPTY type.  */
+#define UT_UNKNOWN	EMPTY
+
+
+/* Tell the user that we have a modern system with UT_HOST, UT_PID,
+   UT_TYPE, UT_ID and UT_TV fields.  */
+#define _HAVE_UT_TYPE	1
+#define _HAVE_UT_PID	1
+#define _HAVE_UT_ID	1
+#define _HAVE_UT_TV	1
+#define _HAVE_UT_HOST	1