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Revive hadrware input flow control

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Submitted by: iverson@lionheart.com
This commit is contained in:
Andrey A. Chernov 1995-02-22 23:20:51 +00:00
parent 343f523cb9
commit d8947494e5
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=6642
1 changed files with 9 additions and 11 deletions
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20
sys/kern/tty.c
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@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* @(#)tty.c 8.8 (Berkeley) 1/21/94
* $Id: tty.c,v 1.27 1995/02/15 18:41:56 ugen Exp $
* $Id: tty.c,v 1.28 1995/02/15 22:25:51 ache Exp $
*/
#include "snp.h"
@ -308,7 +308,7 @@ parmrk: (void)putc(0377 | TTY_QUOTE, &tp->t_rawq);
/*
* In tandem mode, check high water mark.
*/
if (ISSET(iflag, IXOFF))
if (ISSET(iflag, IXOFF) || ISSET(tp->t_cflag, CRTS_IFLOW))
ttyblock(tp);
if (!ISSET(tp->t_state, TS_TYPEN) && ISSET(iflag, ISTRIP))
CLR(c, 0x80);
@ -1107,19 +1107,16 @@ ttyblock(tp)
register int total;
total = tp->t_rawq.c_cc + tp->t_canq.c_cc;
if (tp->t_rawq.c_cc > TTYHOG) {
ttyflush(tp, FREAD | FWRITE);
CLR(tp->t_state, TS_TBLOCK);
}
/*
* Block further input iff: current input > threshold
* AND input is available to user program.
*/
if ((total >= TTYHOG / 2 &&
if (total >= TTYHOG / 2 &&
!ISSET(tp->t_state, TS_TBLOCK) &&
!ISSET(tp->t_lflag, ICANON)) || (tp->t_canq.c_cc > 0 &&
tp->t_cc[VSTOP] != _POSIX_VDISABLE)) {
if (putc(tp->t_cc[VSTOP], &tp->t_outq) == 0) {
(!ISSET(tp->t_lflag, ICANON) || tp->t_canq.c_cc > 0)) {
if (tp->t_cc[VSTOP] != _POSIX_VDISABLE &&
putc(tp->t_cc[VSTOP], &tp->t_outq) == 0 ||
ISSET(tp->t_cflag, CRTS_IFLOW)) {
SET(tp->t_state, TS_TBLOCK);
ttstart(tp);
}
@ -1499,7 +1496,8 @@ ttread(tp, uio, flag)
s = spltty();
if (ISSET(tp->t_state, TS_TBLOCK) && tp->t_rawq.c_cc < TTYHOG/5) {
if (cc[VSTART] != _POSIX_VDISABLE &&
putc(cc[VSTART], &tp->t_outq) == 0) {
putc(cc[VSTART], &tp->t_outq) == 0 ||
ISSET(tp->t_cflag, CRTS_IFLOW)) {
CLR(tp->t_state, TS_TBLOCK);
ttstart(tp);
}