From e33e8dd4a86cd33fe28b83d7b83ac323d854106d Mon Sep 17 00:00:00 2001
From: ache <ache@FreeBSD.org>
Date: Tue, 28 Feb 1995 23:21:33 +0000
Subject: Workaround IXOFF bug when output queue is full && RTS control is on

---
 sys/dev/sio/sio.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'sys/dev/sio/sio.c')

diff --git a/sys/dev/sio/sio.c b/sys/dev/sio/sio.c
index e5115e8..1d8bf01 100644
--- a/sys/dev/sio/sio.c
+++ b/sys/dev/sio/sio.c
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	from: @(#)com.c	7.5 (Berkeley) 5/16/91
- *	$Id: sio.c,v 1.68 1995/02/26 02:30:18 bde Exp $
+ *	$Id: sio.c,v 1.69 1995/02/28 00:20:54 pst Exp $
  */
 
 #include "sio.h"
@@ -1531,12 +1531,16 @@ repeat:
 		     * Only have it in standard one now.
 		     */
 		    && linesw[tp->t_line].l_rint == ttyinput) {
+			int queue_full = 0;
+
 			if ((tp->t_iflag & IXOFF) &&
 			    tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
-			    putc(tp->t_cc[VSTOP], &tp->t_outq) == 0 ||
+			    (queue_full = putc(tp->t_cc[VSTOP], &tp->t_outq)) == 0 ||
 			    (com->state & CS_RTS_IFLOW)) {
 				tp->t_state |= TS_TBLOCK;
 				ttstart(tp);
+				if (queue_full) /* try again */
+					tp->t_state &= ~TS_TBLOCK;
 			}
 		}
 		/*
-- 
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