From 76107ba3af9cfddd62dc3f9dfab45bcf93d10f9e Mon Sep 17 00:00:00 2001
From: Bruce Evans <bde@FreeBSD.org>
Date: Wed, 2 Aug 1995 02:55:47 +0000
Subject: [PATCH] Don't set TS_ZOMBIE flag for non-open ptys.  ptcclose() has
 always done too much for non-open ptys, but there is normally no problem
 because the l_modem(, 0) is a no-op for closed ptys provided the line
 discipline is standard and MDMBUF isn't set.

---
 sys/kern/tty_pty.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/sys/kern/tty_pty.c b/sys/kern/tty_pty.c
index 178082dd0f9b..9bbb0035daf9 100644
--- a/sys/kern/tty_pty.c
+++ b/sys/kern/tty_pty.c
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)tty_pty.c	8.2 (Berkeley) 9/23/93
- * $Id: tty_pty.c,v 1.15 1995/07/22 16:45:08 bde Exp $
+ * $Id: tty_pty.c,v 1.16 1995/07/31 21:01:25 bde Exp $
  */
 
 /*
@@ -312,9 +312,11 @@ ptcclose(dev)
 	 * sense for ptys.  Recover by doing everything that a normal
 	 * ttymodem() would have done except for sending a SIGHUP.
 	 */
-	tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
-	tp->t_state |= TS_ZOMBIE;
-	ttyflush(tp, FREAD | FWRITE);
+	if (tp->t_state & TS_ISOPEN) {
+		tp->t_state &= ~(TS_CARR_ON | TS_CONNECTED);
+		tp->t_state |= TS_ZOMBIE;
+		ttyflush(tp, FREAD | FWRITE);
+	}
 
 	tp->t_oproc = 0;		/* mark closed */
 	tp->t_session = 0;