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Workaround IXOFF bug when output queue is full && RTS control is on

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This commit is contained in:
Andrey A. Chernov 1995-02-28 23:21:33 +00:00
parent c71243fd9a
commit 5d8619d1f2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=6790
4 changed files with 34 additions and 10 deletions
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8
sys/dev/sio/sio.c
View File

@ -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;
}
}
/*

8
sys/i386/isa/sio.c
View File

@ -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;
}
}
/*

8
sys/isa/sio.c
View File

@ -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;
}
}
/*

20
sys/kern/tty.c
View File

@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* @(#)tty.c 8.8 (Berkeley) 1/21/94
* $Id: tty.c,v 1.33 1995/02/27 19:47:31 ugen Exp $
* $Id: tty.c,v 1.34 1995/02/28 00:21:03 pst Exp $
*/
#include "snp.h"
@ -1098,12 +1098,16 @@ ttyflush(tp, rw)
}
if ((rw & FREAD) &&
ISSET(tp->t_state, TS_TBLOCK) && tp->t_rawq.c_cc < TTYHOG/5) {
int queue_full = 0;
if (ISSET(tp->t_iflag, IXOFF) &&
tp->t_cc[VSTART] != _POSIX_VDISABLE &&
putc(tp->t_cc[VSTART], &tp->t_outq) == 0 ||
(queue_full = putc(tp->t_cc[VSTART], &tp->t_outq)) == 0 ||
ISSET(tp->t_cflag, CRTS_IFLOW)) {
CLR(tp->t_state, TS_TBLOCK);
ttstart(tp);
if (queue_full) /* try again */
SET(tp->t_state, TS_TBLOCK);
}
}
splx(s);
@ -1137,12 +1141,16 @@ ttyblock(tp)
if (total >= TTYHOG / 2 &&
!ISSET(tp->t_state, TS_TBLOCK) &&
(!ISSET(tp->t_lflag, ICANON) || tp->t_canq.c_cc > 0)) {
int queue_full = 0;
if (ISSET(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 ||
ISSET(tp->t_cflag, CRTS_IFLOW)) {
SET(tp->t_state, TS_TBLOCK);
ttstart(tp);
if (queue_full) /* try again */
CLR(tp->t_state, TS_TBLOCK);
}
}
}
@ -1531,12 +1539,16 @@ read:
*/
s = spltty();
if (ISSET(tp->t_state, TS_TBLOCK) && tp->t_rawq.c_cc < TTYHOG/5) {
int queue_full = 0;
if (ISSET(tp->t_iflag, IXOFF) &&
cc[VSTART] != _POSIX_VDISABLE &&
putc(cc[VSTART], &tp->t_outq) == 0 ||
(queue_full = putc(cc[VSTART], &tp->t_outq)) == 0 ||
ISSET(tp->t_cflag, CRTS_IFLOW)) {
CLR(tp->t_state, TS_TBLOCK);
ttstart(tp);
if (queue_full) /* try again */
SET(tp->t_state, TS_TBLOCK);
}
}
splx(s);