Two new options:

- server option "exit-unattached" makes the server exit when no clients
  are attached, even if sessions are present;

- session option "destroy-unattached" destroys a session once no clients
  are attached to it.

These are useful for preventing tmux remaining in the background where
it is undesirable and when using tmux as a login shell to keep a limit
on new sessions.

8 files changed, 47 insertions, 13 deletions

diff --git a/usr.bin/tmux/cmd-set-option.c b/usr.bin/tmux/cmd-set-option.c
index c7baf3fcf05..ebc0f709564 100644
--- a/usr.bin/tmux/cmd-set-option.c
+++ b/usr.bin/tmux/cmd-set-option.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: cmd-set-option.c,v 1.38 2010/09/01 21:06:51 nicm Exp $ */
+/* $OpenBSD: cmd-set-option.c,v 1.39 2010/09/26 20:43:30 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -75,6 +75,7 @@ const char *set_option_bell_action_list[] = {
 
 const struct set_option_entry set_option_table[] = {
 	{ "escape-time", SET_OPTION_NUMBER, 0, INT_MAX, NULL },
+	{ "exit-unattached", SET_OPTION_FLAG, 0, 0, NULL },
 	{ "quiet", SET_OPTION_FLAG, 0, 0, NULL },
 	{ NULL, 0, 0, 0, NULL }
 };
@@ -87,6 +88,7 @@ const struct set_option_entry set_session_option_table[] = {
 	{ "default-path", SET_OPTION_STRING, 0, 0, NULL },
 	{ "default-shell", SET_OPTION_STRING, 0, 0, NULL },
 	{ "default-terminal", SET_OPTION_STRING, 0, 0, NULL },
+	{ "destroy-unattached", SET_OPTION_FLAG, 0, 0, NULL },
 	{ "detach-on-destroy", SET_OPTION_FLAG, 0, 0, NULL },
 	{ "display-panes-colour", SET_OPTION_COLOUR, 0, 0, NULL },
 	{ "display-panes-active-colour", SET_OPTION_COLOUR, 0, 0, NULL },
diff --git a/usr.bin/tmux/cmd-switch-client.c b/usr.bin/tmux/cmd-switch-client.c
index d44c4ef276f..4f9a6d12cb7 100644
--- a/usr.bin/tmux/cmd-switch-client.c
+++ b/usr.bin/tmux/cmd-switch-client.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: cmd-switch-client.c,v 1.6 2010/09/08 22:02:28 nicm Exp $ */
+/* $OpenBSD: cmd-switch-client.c,v 1.7 2010/09/26 20:43:30 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -152,6 +152,7 @@ cmd_switch_client_exec(struct cmd *self, struct cmd_ctx *ctx)
 	c->session = s;
 
 	recalculate_sizes();
+	server_check_unattached();
 	server_redraw_client(c);
 
 	return (0);
diff --git a/usr.bin/tmux/server-client.c b/usr.bin/tmux/server-client.c
index bd575ecbc22..21c22b4c8a7 100644
--- a/usr.bin/tmux/server-client.c
+++ b/usr.bin/tmux/server-client.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: server-client.c,v 1.40 2010/08/31 22:46:59 nicm Exp $ */
+/* $OpenBSD: server-client.c,v 1.41 2010/09/26 20:43:30 nicm Exp $ */
 
 /*
  * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -185,6 +185,7 @@ server_client_lost(struct client *c)
 	c->flags |= CLIENT_DEAD;
 
 	recalculate_sizes();
+	server_check_unattached();
 	server_update_socket();
 }
 
diff --git a/usr.bin/tmux/server-fn.c b/usr.bin/tmux/server-fn.c
index 3e47f7b6edc..a69ff8d9d67 100644
--- a/usr.bin/tmux/server-fn.c
+++ b/usr.bin/tmux/server-fn.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: server-fn.c,v 1.41 2010/08/11 07:36:23 nicm Exp $ */
+/* $OpenBSD: server-fn.c,v 1.42 2010/09/26 20:43:30 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -405,6 +405,25 @@ server_destroy_session(struct session *s)
 }
 
 void
+server_check_unattached (void)
+{
+	struct session	*s;
+	u_int		 i;
+
+	/*
+	 * If any sessions are no longer attached and have destroy-unattached
+	 * set, collect them.
+	 */
+	for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
+		s = ARRAY_ITEM(&sessions, i);
+		if (s == NULL || !(s->flags & SESSION_UNATTACHED))
+			continue;
+		if (options_get_number (&s->options, "destroy-unattached"))
+			session_destroy(s);
+	}
+}
+
+void
 server_set_identify(struct client *c)
 {
 	struct timeval	tv;
diff --git a/usr.bin/tmux/server.c b/usr.bin/tmux/server.c
index 973f0c40a65..f13b3b98bd2 100644
--- a/usr.bin/tmux/server.c
+++ b/usr.bin/tmux/server.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: server.c,v 1.93 2010/09/26 18:51:48 nicm Exp $ */
+/* $OpenBSD: server.c,v 1.94 2010/09/26 20:43:30 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -222,15 +222,17 @@ server_loop(void)
 	}
 }
 
-/* Check if the server should be shutting down (no more clients or windows). */
+/* Check if the server should be shutting down (no more clients or sessions). */
 int
 server_should_shutdown(void)
 {
 	u_int	i;
 
-	for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
-		if (ARRAY_ITEM(&sessions, i) != NULL)
-			return (0);
+	if (!options_get_number(&global_options, "exit-unattached")) {
+		for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
+			if (ARRAY_ITEM(&sessions, i) != NULL)
+				return (0);
+		}
 	}
 	for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
 		if (ARRAY_ITEM(&clients, i) != NULL)
diff --git a/usr.bin/tmux/tmux.1 b/usr.bin/tmux/tmux.1
index 84b940e615f..e3c8f99c32e 100644
--- a/usr.bin/tmux/tmux.1
+++ b/usr.bin/tmux/tmux.1
@@ -1,4 +1,4 @@
-.\" $OpenBSD: tmux.1,v 1.184 2010/09/25 20:35:52 nicm Exp $
+.\" $OpenBSD: tmux.1,v 1.185 2010/09/26 20:43:30 nicm Exp $
 .\"
 .\" Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
 .\"
@@ -14,7 +14,7 @@
 .\" IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 .\" OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd $Mdocdate: September 25 2010 $
+.Dd $Mdocdate: September 26 2010 $
 .Dt TMUX 1
 .Os
 .Sh NAME
@@ -1587,6 +1587,9 @@ Set the time in milliseconds for which
 waits after an escape is input to determine if it is part of a function or meta
 key sequences.
 The default is 500 milliseconds.
+.It Ic exit-unattached
+If enabled, the server will exit when there are no attached clients, rather
+than when there are no attached sessions.
 .It Ic quiet
 Enable or disable the display of various informational messages (see also the
 .Fl q
@@ -1659,6 +1662,9 @@ to work correctly, this
 be set to
 .Ql screen
 or a derivative of it.
+.It Ic destroy-unattached
+If enabled and the session is no longer attached to any clients, it is
+destroyed.
 .It Ic detach-on-destroy
 If on (the default), the client is detached when the session it is attached to
 is destroyed.
diff --git a/usr.bin/tmux/tmux.c b/usr.bin/tmux/tmux.c
index 3493b2bd35c..f28800f91e2 100644
--- a/usr.bin/tmux/tmux.c
+++ b/usr.bin/tmux/tmux.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: tmux.c,v 1.87 2010/08/19 18:29:01 nicm Exp $ */
+/* $OpenBSD: tmux.c,v 1.88 2010/09/26 20:43:30 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -331,6 +331,7 @@ main(int argc, char **argv)
 	oo = &global_options;
 	options_set_number(oo, "quiet", quiet);
 	options_set_number(oo, "escape-time", 500);
+	options_set_number(oo, "exit-unattached", 0);
 
 	options_init(&global_s_options, NULL);
 	so = &global_s_options;
@@ -341,6 +342,7 @@ main(int argc, char **argv)
 	options_set_string(so, "default-path", "%s", "");
 	options_set_string(so, "default-shell", "%s", getshell());
 	options_set_string(so, "default-terminal", "screen");
+	options_set_number(so, "destroy-unattached", 0);
 	options_set_number(so, "detach-on-destroy", 1);
 	options_set_number(so, "display-panes-active-colour", 1);
 	options_set_number(so, "display-panes-colour", 4);
diff --git a/usr.bin/tmux/tmux.h b/usr.bin/tmux/tmux.h
index bd29e5f549e..e419cb59e26 100644
--- a/usr.bin/tmux/tmux.h
+++ b/usr.bin/tmux/tmux.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: tmux.h,v 1.240 2010/09/11 16:19:22 nicm Exp $ */
+/* $OpenBSD: tmux.h,v 1.241 2010/09/26 20:43:30 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -1661,6 +1661,7 @@ void	 server_unlink_window(struct session *, struct winlink *);
 void	 server_destroy_pane(struct window_pane *);
 void	 server_destroy_session_group(struct session *);
 void	 server_destroy_session(struct session *);
+void	 server_check_unattached (void);
 void	 server_set_identify(struct client *);
 void	 server_clear_identify(struct client *);
 void	 server_update_event(struct client *);