Acincy.1109
net.bugs.2bsd
utzoo!decvax!harpo!zeppo!wheps!eagle!mhuxt!cbosg!cincy!jreuter
Mon May  3 08:28:35 1982
LMDMBUF and LNOHANG with dz
The dz and dh drivers for 2.8BSD don't support the LMDMBUF and LNOHANG
options that will allow a device to use carrier-detect to handshake.
I had to do this for an Epson MX-100 with a 2k buffer serial option (I
understand they now have a 2k buffer serial option that does XON and XOFF
so get that if you're buying Epsons...) so here is the diff with the fixed.

This still didn't quite cut it on an 11/23 because the callouts didn't
always get processed fast enough to detect the change in CD before the buffer
filled.  I plan to call dzscan from dzxint every 16 interrupts or so, but
that's a kluge so I'm not publishing it.

diff dz.c dz.c.old
28d27
t_flags&RAW) || (tp->t_flags&LLITOUT) )
---
> 	if (tp->t_flags&RAW)
286c284
 	if (flag==OFF)
288,290c286
dzdtr |= bit;
 	else	dzaddr->dzdtr |= bit;
305,314c301,303
t_state&WOPEN)==0 &&
t_local&LMDMBUF) ) {
t_state &= ~TTSTOP;
t_rawq );
t_state |= CARR_ON;
 			if ((tp->t_state&CARR_ON)==0) {
> 				wakeup((caddr_t)&tp->t_rawq);
> 				tp->t_state |= CARR_ON;
317,323c306,309
t_state&WOPEN)==0 &&
t_local&LMDMBUF) )
t_state |= TTSTOP;
t_state&WOPEN)==0 &&
t_local&LNOHANG)==0 ) {
t_pgrp, SIGHUP );
---
> 			if ((tp->t_state&CARR_ON) &&
> 			    (tp->t_local&LNOHANG)==0) {
> 				if (tp->t_state&ISOPEN) {
> 					signal(tp->t_pgrp, SIGHUP);
325,328c311,313
t_state &= ~CARR_ON;
 					flushtty(tp, FREAD|FWRITE);
> 				}
> 				tp->t_state &= ~CARR_ON;
332c317
 	timeout(dzscan, (caddr_t)0, 120);

	Jim Reuter

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