Use utempter to update utmp if it's around for configure, from madmaverick9 at

roxxmail dot eu.

configure.ac

@@ -144,6 +144,13 @@ if test "x$found_curses" = xno; then
     AC_MSG_ERROR("curses not found")
 fi
 
+# Look for utempter
+AC_CHECK_HEADER(utempter.h, have_utempter=yes, have_utempter=no)
+if test "x$have_utempter" = xyes; then
+   AC_DEFINE(HAVE_UTEMPTER)
+   LIBS="$LIBS -lutempter"
+fi
+
 # Check for b64_ntop.
 AC_MSG_CHECKING(for b64_ntop)
 AC_TRY_LINK(

server-fn.c

@@ -361,6 +361,9 @@ server_destroy_pane(struct window_pane *wp)
 
 	old_fd = wp->fd;
 	if (wp->fd != -1) {
+#ifdef HAVE_UTEMPTER
+		utempter_remove_record(wp->fd);
+#endif
 		bufferevent_free(wp->event);
 		close(wp->fd);
 		wp->fd = -1;

tmux.h

@@ -32,6 +32,10 @@
 #include <stdio.h>
 #include <termios.h>
 
+#ifdef HAVE_UTEMPTER
+#include <utempter.h>
+#endif
+
 #include "array.h"
 
 #include "compat.h"

window.c

@@ -779,6 +779,9 @@ window_pane_destroy(struct window_pane *wp)
 		evtimer_del(&wp->changes_timer);
 
 	if (wp->fd != -1) {
+#ifdef HAVE_UTEMPTER
+		utempter_remove_record(wp->fd);
+#endif
 		bufferevent_free(wp->event);
 		close(wp->fd);
 	}
@@ -810,6 +813,9 @@ window_pane_spawn(struct window_pane *wp, const char *cmd, const char *shell,
 	char		*argv0, paneid[16];
 	const char	*ptr;
 	struct termios	 tio2;
+#ifdef HAVE_UTEMPTER
+	char		 s[32];
+#endif
 
 	if (wp->fd != -1) {
 		bufferevent_free(wp->event);
@@ -886,6 +892,11 @@ window_pane_spawn(struct window_pane *wp, const char *cmd, const char *shell,
 		fatal("execl failed");
 	}
 
+#ifdef HAVE_UTEMPTER
+	xsnprintf(s, sizeof s, "tmux(%lu):%%%u", (long) getpid(), wp->id);
+	utempter_add_record(wp->fd, s);
+#endif
+
 	setblocking(wp->fd, 0);
 
 	wp->event = bufferevent_new(wp->fd,