===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/tmux/client.c,v
retrieving revision 1.136
retrieving revision 1.137
diff -c -r1.136 -r1.137
*** src/usr.bin/tmux/client.c	2019/12/16 16:09:28	1.136
--- src/usr.bin/tmux/client.c	2020/01/29 16:22:32	1.137
***************
*** 1,4 ****
! /* $OpenBSD: client.c,v 1.136 2019/12/16 16:09:28 nicm Exp $ */
  
  /*
   * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
--- 1,4 ----
! /* $OpenBSD: client.c,v 1.137 2020/01/29 16:22:32 nicm Exp $ */
  
  /*
   * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
***************
*** 862,867 ****
--- 862,873 ----
  		break;
  	case MSG_WRITE_CLOSE:
  		client_write_close(data, datalen);
+ 		break;
+ 	case MSG_OLDSTDERR:
+ 	case MSG_OLDSTDIN:
+ 	case MSG_OLDSTDOUT:
+ 		fprintf(stderr, "server version is too old for client\n");
+ 		proc_exit(client_proc);
  		break;
  	}
  }