OS-2204 SunSSH has a maximum of 10 multiplexed sessions

@@ -23,10 +23,15 @@
  */
 /*
  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
+/*
+ * Copyright (c) 2013, Joyent, Inc.  All rights reserved.
+ */
+
+#include "sys-queue.h"
 
 #ifndef _SESSION_H
 #define _SESSION_H
 
 #ifdef __cplusplus

@@ -35,11 +40,11 @@
 
 /*      $OpenBSD: session.h,v 1.19 2002/06/30 21:59:45 deraadt Exp $    */
 #define TTYSZ 64
 typedef struct Session Session;
 struct Session {
-        int     used;
+        LIST_ENTRY(Session) list_entry;
         int     self;
         struct passwd *pw;
         Authctxt *authctxt;
         pid_t   pid;
         /* tty */