===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/tmux/server.c,v
retrieving revision 1.189
retrieving revision 1.190
diff -u -r1.189 -r1.190
--- src/usr.bin/tmux/server.c	2020/05/16 15:24:28	1.189
+++ src/usr.bin/tmux/server.c	2020/05/16 15:47:22	1.190
@@ -1,4 +1,4 @@
-/* $OpenBSD: server.c,v 1.189 2020/05/16 15:24:28 nicm Exp $ */
+/* $OpenBSD: server.c,v 1.190 2020/05/16 15:47:22 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -51,6 +51,9 @@
 
 struct cmd_find_state	 marked_pane;
 
+static u_int		 message_next;
+struct message_list	 message_log;
+
 static int	server_loop(void);
 static void	server_send_exit(void);
 static void	server_accept(int, short, void *);
@@ -195,6 +198,7 @@
 	TAILQ_INIT(&clients);
 	RB_INIT(&sessions);
 	key_bindings_init();
+	TAILQ_INIT(&message_log);
 
 	gettimeofday(&start_time, NULL);
 
@@ -482,4 +486,35 @@
 		}
 	}
 	job_check_died(pid, status);
+}
+
+/* Add to message log. */
+void
+server_add_message(const char *fmt, ...)
+{
+	struct message_entry	*msg, *msg1;
+	char			*s;
+	va_list			 ap;
+	u_int			 limit;
+
+	va_start(ap, fmt);
+	xvasprintf(&s, fmt, ap);
+	va_end(ap);
+
+	log_debug("message: %s", s);
+
+	msg = xcalloc(1, sizeof *msg);
+	gettimeofday(&msg->msg_time, NULL);
+	msg->msg_num = message_next++;
+	msg->msg = s;
+	TAILQ_INSERT_TAIL(&message_log, msg, entry);
+
+	limit = options_get_number(global_options, "message-limit");
+	TAILQ_FOREACH_SAFE(msg, &message_log, entry, msg1) {
+		if (msg->msg_num + limit >= message_next)
+			break;
+		free(msg->msg);
+		TAILQ_REMOVE(&message_log, msg, entry);
+		free(msg);
+	}
 }