Support for individual session idle time locking. May be enabled by turning off

the lock-server option (it is on by default). When this is off, each session
locks when it has been idle for the lock-after-time setting. When on, the
entire server locks when ALL sessions have been idle for their individual
lock-after-time settings.

This replaces one global-only option (lock-after-time) with another
(lock-server), but the default behaviour is usually preferable so there don't
seem to be many alternatives.

Diff/idea largely from Thomas Adam, tweaked by me.

cmd-set-option.c

@@ -63,6 +63,7 @@ const struct set_option_entry set_option_table[] = {
 	{ "history-limit", SET_OPTION_NUMBER, 0, INT_MAX, NULL },
 	{ "lock-after-time", SET_OPTION_NUMBER, 0, INT_MAX, NULL },
 	{ "lock-command", SET_OPTION_STRING, 0, 0, NULL },
+	{ "lock-server", SET_OPTION_FLAG, 0, 0, NULL },
 	{ "message-attr", SET_OPTION_ATTRIBUTES, 0, 0, NULL },
 	{ "message-bg", SET_OPTION_COLOUR, 0, 0, NULL },
 	{ "message-fg", SET_OPTION_COLOUR, 0, 0, NULL },

server-msg.c

@@ -105,7 +105,8 @@ server_msg_dispatch(struct client *c)
 			tty_start_tty(&c->tty);
 			server_redraw_client(c);
 			recalculate_sizes();
-			server_activity = time(NULL);
+			if (c->session != NULL)
+				c->session->activity = time(NULL);
 			break;
 		case MSG_ENVIRON:
 			if (datalen != sizeof environdata)
@@ -181,7 +182,8 @@ server_msg_command(struct client *c, struct msg_command_data *data)
 	int		 argc;
 	char	       **argv, *cause;
 
-	server_activity = time(NULL);
+	if (c->session != NULL)
+		c->session->activity = time(NULL);
 
 	ctx.error = server_msg_command_error;
 	ctx.print = server_msg_command_print;

server.c

@@ -86,6 +86,8 @@ void	 	 server_check_window(struct window *);
 void		 server_check_redraw(struct client *);
 void		 server_set_title(struct client *);
 void		 server_check_timers(struct client *);
+void		 server_lock_server(void);
+void		 server_lock_sessions(void);
 void		 server_second_timers(void);
 int		 server_update_socket(void);
 
@@ -249,8 +251,6 @@ server_start(char *path)
 	key_bindings_init();
 	utf8_build();
 
-	server_activity = time(NULL);
-
 	start_time = time(NULL);
 	socket_path = path;
 
@@ -842,10 +842,10 @@ server_handle_client(struct client *c)
 	/* Process keys. */
 	keylist = options_get_data(&c->session->options, "prefix");
 	while (tty_keys_next(&c->tty, &key, mouse) == 0) {
-		server_activity = time(NULL);
-
 		if (c->session == NULL)
 			return;
+
+		c->session->activity = time(NULL);
 		w = c->session->curw->window;
 		wp = w->active;	/* could die */
 
@@ -1254,6 +1254,51 @@ server_check_window(struct window *w)
 	recalculate_sizes();
 }
 
+/* Lock the server if ALL sessions have hit the time limit. */
+void
+server_lock_server(void)
+{
+	struct session  *s;
+	u_int            i;
+	int		 timeout;
+	time_t           t;
+
+	t = time(NULL);
+	for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
+		if ((s = ARRAY_ITEM(&sessions, i)) == NULL)
+			continue;
+
+		timeout = options_get_number(&s->options, "lock-after-time");
+		if (timeout <= 0 || t <= s->activity + timeout)
+			return;	/* not timed out */
+	}
+
+	server_lock();
+	recalculate_sizes();
+}
+
+/* Lock any sessions which have timed out. */
+void
+server_lock_sessions(void)
+{
+        struct session  *s;
+        u_int            i;
+	int		 timeout;
+        time_t           t;
+
+        t = time(NULL);
+        for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
+		if ((s = ARRAY_ITEM(&sessions, i)) == NULL)
+			continue;
+
+		timeout = options_get_number(&s->options, "lock-after-time");
+		if (timeout > 0 && t > s->activity + timeout) {
+			server_lock_session(s);
+			recalculate_sizes();
+		}
+	}
+}
+
 /* Call any once-per-second timers. */
 void
 server_second_timers(void)
@@ -1261,16 +1306,11 @@ server_second_timers(void)
 	struct window		*w;
 	struct window_pane	*wp;
 	u_int		 	 i;
-	int			 xtimeout;
-	time_t		 	 t;
 
-	t = time(NULL);
-
-	xtimeout = options_get_number(&global_s_options, "lock-after-time");
-	if (xtimeout > 0 && t > server_activity + xtimeout) {
-		server_lock();
-		recalculate_sizes();
-	}
+	if (options_get_number(&global_s_options, "lock-server"))
+		server_lock_server();
+	else
+		server_lock_sessions();
 
 	for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
 		w = ARRAY_ITEM(&windows, i);

session.c

@@ -23,6 +23,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <time.h>
 
 #include "tmux.h"
 
@@ -124,6 +125,7 @@ session_create(const char *name, const char *cmd, const char *cwd,
 	s = xmalloc(sizeof *s);
 	s->references = 0;
 	s->flags = 0;
+	s->activity = time(NULL);
 
 	if (gettimeofday(&s->tv, NULL) != 0)
 		fatal("gettimeofday failed");

tmux.1

@@ -1253,20 +1253,33 @@ Set the maximum number of lines held in window history.
 This setting applies only to new windows - existing window histories are not
 resized and retain the limit at the point they were created.
 .It Ic lock-after-time Ar number
-Lock the server (like the
-.Ic lock-server
+Lock the session (like the
+.Ic lock-session
 command) after
 .Ar number
-seconds of inactivity.
-The default is off (set to 0).
-This has no effect as a session option; it must be set as a global option using
-.Fl g .
+seconds of inactivity, or the entire server (all sessions) if the
+.Ic lock-server
+option is set.
+The default is not to lock (set to 0).
 .It Ic lock-command Ar command
 Command to run when locking each client.
 The default is to run
 .Xr lock 1
 with
 .Fl np .
+.It Xo Ic lock-server
+.Op Ic on | off
+.Xc
+If this option is
+.Ic on 
+(the default),
+instead of each session locking individually as each has been
+idle for
+.Ic lock-after-time
+, the entire server will lock after
+.Em all
+sessions would have locked.
+This has no effect as a session option; it must be set as a global option.
 .It Ic message-attr Ar attributes
 Set status line message attributes, where
 .Ar attributes

tmux.c

@@ -46,8 +46,6 @@ struct options	 global_s_options;	/* session options */
 struct options	 global_w_options;	/* window options */
 struct environ	 global_environ;
 
-time_t		 server_activity;
-
 int		 debug_level;
 int		 be_quiet;
 time_t		 start_time;
@@ -379,6 +377,7 @@ main(int argc, char **argv)
 	options_set_number(so, "history-limit", 2000);
 	options_set_number(so, "lock-after-time", 0);
 	options_set_string(so, "lock-command", "lock -np");
+	options_set_number(so, "lock-server", 1);
 	options_set_number(so, "message-attr", 0);
 	options_set_number(so, "message-bg", 3);
 	options_set_number(so, "message-fg", 0);

tmux.h

@@ -800,6 +800,7 @@ struct session_alert {
 struct session {
 	char		*name;
 	struct timeval	 tv;
+	time_t		 activity;
 
 	u_int		 sx;
 	u_int		 sy;
@@ -1117,7 +1118,6 @@ extern struct options global_s_options;
 extern struct options global_w_options;
 extern struct environ global_environ;
 extern char	*cfg_file;
-extern time_t	 server_activity;
 extern int	 debug_level;
 extern int	 be_quiet;
 extern time_t	 start_time;