===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/tmux/session.c,v
retrieving revision 1.20
retrieving revision 1.21
diff -u -r1.20 -r1.21
--- src/usr.bin/tmux/session.c	2010/09/08 22:02:28	1.20
+++ src/usr.bin/tmux/session.c	2010/12/20 00:03:55	1.21
@@ -1,4 +1,4 @@
-/* $OpenBSD: session.c,v 1.20 2010/09/08 22:02:28 nicm Exp $ */
+/* $OpenBSD: session.c,v 1.21 2010/12/20 00:03:55 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -34,6 +34,18 @@
 
 struct winlink *session_next_alert(struct winlink *);
 struct winlink *session_previous_alert(struct winlink *);
+
+/*
+ * Find if session is still alive. This is true if it is still on the global
+ * sessions list.
+ */
+int
+session_alive(struct session *s)
+{
+	u_int	idx;
+
+	return (session_index(s, &idx) == 0);
+}
 
 /* Find session by name. */
 struct session *