Finish up utmp processing: add the -ut- command-line option to

suppress stamping it at all. (I suppose this ought to be part of the
cfg structure really.)

[originally from svn r2059]

unix/pterm.c

@@ -1283,6 +1283,7 @@ char *get_x_display(void)
 int main(int argc, char **argv)
 {
     extern int pty_master_fd;	       /* declared in pty.c */
+    extern int pty_stamp_utmp;	       /* declared in pty.c */
     extern char **pty_argv;	       /* declared in pty.c */
     int err = 0;
 
@@ -1329,6 +1330,9 @@ int main(int argc, char **argv)
 	if (!strcmp(p, "-hide")) {
 	    cfg.hide_mouseptr = 1;
 	}
+	if (!strcmp(p, "-ut-")) {
+	    pty_stamp_utmp = 0;
+	}
 	if (!strcmp(p, "-nethack")) {
 	    cfg.nethack_keypad = 1;
 	}

unix/pty.c

@@ -40,7 +40,23 @@
 #endif
 #endif
 
+/*
+ * Set up a default for vaguely sane systems. The idea is that if
+ * OMIT_UTMP is not defined, then at least one of the symbols which
+ * enable particular forms of utmp processing should be, if only so
+ * that a link error can warn you that you should have defined
+ * OMIT_UTMP if you didn't want any. Currently HAVE_PUTUTLINE is
+ * the only such symbol.
+ */
+#ifndef OMIT_UTMP
+#if !defined HAVE_PUTUTLINE
+#define HAVE_PUTUTLINE
+#endif
+#endif
+
 int pty_master_fd;
+int pty_stamp_utmp = 1;
+static int pty_stamped_utmp = 0;
 static int pty_child_pid;
 static sig_atomic_t pty_child_dead;
 #ifndef OMIT_UTMP
@@ -63,10 +79,14 @@ static void setup_utmp(char *ttyname)
     FILE *lastlog;
 #endif
     struct passwd *pw;
-    char *location = get_x_display();
+    char *location;
     FILE *wtmp;
 
+    if (!pty_stamp_utmp)
+	return;
+
     pw = getpwuid(getuid());
+    location = get_x_display();
     memset(&utmp_entry, 0, sizeof(utmp_entry));
     utmp_entry.ut_type = USER_PROCESS;
     utmp_entry.ut_pid = getpid();
@@ -100,6 +120,8 @@ static void setup_utmp(char *ttyname)
     }
 #endif
 
+    pty_stamped_utmp = 1;
+
 #endif
 }
 
@@ -108,6 +130,9 @@ static void cleanup_utmp(void)
 #ifndef OMIT_UTMP
     FILE *wtmp;
 
+    if (!pty_stamp_utmp || !pty_stamped_utmp)
+	return;
+
     utmp_entry.ut_type = DEAD_PROCESS;
     memset(utmp_entry.ut_user, 0, lenof(utmp_entry.ut_user));
     time(&utmp_entry.ut_time);
@@ -127,6 +152,7 @@ static void cleanup_utmp(void)
     endutent();
 #endif
 
+    pty_stamped_utmp = 0;	       /* ensure we never double-cleanup */
 #endif
 }