Let telnetd build without utmp and logwtmp(3).

Just like rlogind, there is no need to change the ownership of the
terminal during shutdown anymore. Also don't call logwtmp, because the
login(1)/PAM is responsible for doing this. Also use SHUT_RDWR instead
of 2.

contrib/telnet/telnetd/sys_term.c

@@ -1303,24 +1303,7 @@ scrub_env(void)
 void
 cleanup(int sig __unused)
 {
-	char *p;
-	sigset_t mask;
 
-	p = line + sizeof(_PATH_DEV) - 1;
+	(void) shutdown(net, SHUT_RDWR);
-	/*
-	 * Block all signals before clearing the utmp entry.  We don't want to
-	 * be called again after calling logout() and then not add the wtmp
-	 * entry because of not finding the corresponding entry in utmp.
-	 */
-	sigfillset(&mask);
-	sigprocmask(SIG_SETMASK, &mask, NULL);
-	if (logout(p))
-		logwtmp(p, "", "");
-	(void)chmod(line, 0666);
-	(void)chown(line, 0, 0);
-	*p = 'p';
-	(void)chmod(line, 0666);
-	(void)chown(line, 0, 0);
-	(void) shutdown(net, 2);
 	_exit(1);
 }

contrib/telnet/telnetd/telnetd.c

@@ -47,7 +47,6 @@ __FBSDID("$FreeBSD$");
 #include <libutil.h>
 #include <paths.h>
 #include <termcap.h>
-#include <utmp.h>
 
 #include <arpa/inet.h>