From 8b731e319e30a54190452e866c4152dc5a21f859 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Tue, 15 May 1990 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1990-05-15

---
 gnot/devcons.c | 43 +++++++++++++++++++++++++++++++++++++------
 gnot/trap.c    |  4 ++--
 port/chan.c    |  4 +---
 port/devbit.c  |  7 ++-----
 power/trap.c   |  2 +-
 5 files changed, 43 insertions(+), 17 deletions(-)

diff --git a/gnot/devcons.c b/gnot/devcons.c
index b09a8f747561721636b64fd2806f6937f82fde7c..65f05b8e09b8ca9d05e3c3c857b3dbbf518a7a46 100644
--- a/gnot/devcons.c
+++ b/gnot/devcons.c
@@ -30,7 +30,7 @@ struct IOQ{
 	Rendez	r;
 };
 
-IOQ	lineq;		/* lock to getc; interrupt putc's */
+IOQ	lineq;
 
 struct{
 	IOQ;		/* qlock to getc; interrupt putc's */
@@ -39,6 +39,8 @@ struct{
 	int	count;
 }kbdq;
 
+Ref	raw;		/* whether kbd i/o is raw (rcons is open) */
+
 void
 printinit(void)
 {
@@ -88,6 +90,8 @@ isbrkc(IOQ *q)
 	uchar *p;
 
 	for(p=q->out; p!=q->in; ){
+		if(raw.ref)
+			return 1;
 		if(*p==0x04 || *p=='\n')
 			return 1;
 		p++;
@@ -180,6 +184,8 @@ echo(int c)
 	 */
 	if(c == 0x14)
 		DEBUG();
+	if(raw.ref)
+		return;
 	if(c == 0x15)
 		putstrn("^U\n", 3);
 	else{
@@ -207,7 +213,7 @@ kbdchar(int c)
 	*kbdq.in++ = c;
 	if(kbdq.in == kbdq.buf+sizeof(kbdq.buf))
 		kbdq.in = kbdq.buf;
-	if(c=='\n' || c==0x04)
+	if(raw.ref || c=='\n' || c==0x04)
 		wakeup(&kbdq.r);
 }
 
@@ -244,6 +250,7 @@ enum{
 	Qpgrpid,
 	Qpid,
 	Qppid,
+	Qrcons,
 	Qtime,
 	Quser,
 };
@@ -255,6 +262,7 @@ Dirtab consdir[]={
 	"pgrpid",	Qpgrpid,	12,	0600,
 	"pid",		Qpid,		12,	0600,
 	"ppid",		Qppid,		12,	0600,
+	"rcons",	Qrcons,		0,	0600,
 	"time",		Qtime,		12,	0600,
 	"user",		Quser,		0,	0600,
 };
@@ -336,6 +344,8 @@ consstat(Chan *c, char *dp)
 Chan*
 consopen(Chan *c, int omode)
 {
+	int ch;
+
 	if(c->qid==Quser && omode==(OWRITE|OTRUNC)){
 		/* truncate? */
 		if(strcmp(u->p->pgrp->user, "bootes") == 0)	/* BUG */
@@ -343,6 +353,16 @@ consopen(Chan *c, int omode)
 		else
 			error(0, Eperm);
 	}
+	if(c->qid == Qrcons)
+		if(incref(&raw) == 0){
+			lock(&lineq);
+			while((ch=getc(&kbdq)) != -1){
+				*lineq.in++ = ch;
+				if(lineq.in == lineq.buf+sizeof(lineq.buf))
+					lineq.in = lineq.buf;
+			}
+			unlock(&lineq);
+		}
 	return devopen(c, omode, consdir, NCONS, devgen);
 }
 
@@ -355,6 +375,8 @@ conscreate(Chan *c, char *name, int omode, ulong perm)
 void
 consclose(Chan *c)
 {
+	if(c->qid == Qrcons)
+		decref(&raw);
 }
 
 long
@@ -374,12 +396,18 @@ consread(Chan *c, void *buf, long n)
 	case Qdir:
 		return devdirread(c, buf, n, consdir, NCONS, devgen);
 
+	case Qrcons:
 	case Qcons:
 		qlock(&kbdq);
 		while(!cangetc(&lineq)){
 			sleep(&kbdq.r, (int(*)(void*))isbrkc, &kbdq);
 			do{
+				lock(&lineq);
 				ch = getc(&kbdq);
+				if(raw.ref){
+					unlock(&lineq);
+					goto Default;
+				}
 				switch(ch){
 				case '\b':
 					if(lineq.in != lineq.out){
@@ -391,17 +419,19 @@ consread(Chan *c, void *buf, long n)
 				case 0x15:
 					lineq.in = lineq.out;
 					break;
+				Default:
 				default:
 					*lineq.in++ = ch;
 					if(lineq.in == lineq.buf+sizeof(lineq.buf))
-					lineq.in = lineq.buf;
+						lineq.in = lineq.buf;
 				}
-			}while(ch!='\n' && ch!=0x04);
+				unlock(&lineq);
+			}while(raw.ref==0 && ch!='\n' && ch!=0x04);
 		}
 		i = 0;
-		while(n>0){
+		while(n > 0){
 			ch = getc(&lineq);
-			if(ch == 0x04 || ch == -1)
+			if(ch==-1 || (raw.ref==0 && ch==0x04))
 				break;
 			i++;
 			*cbuf++ = ch;
@@ -461,6 +491,7 @@ conswrite(Chan *c, void *va, long n)
 
 	switch(c->qid){
 	case Qcons:
+	case Qrcons:
 		/*
 		 * Damn. Can't page fault in putstrn, so copy the data locally.
 		 */
diff --git a/gnot/trap.c b/gnot/trap.c
index 9766f66c7400e288ad20196f4ee2d53b765251ce..47a1340c04ff6f0b24e881dc42107df6744bd9c2 100644
--- a/gnot/trap.c
+++ b/gnot/trap.c
@@ -278,8 +278,8 @@ syscall(Ureg *aur)
 			goto Bad;
 		}
 		if(sp<(USTKTOP-BY2PG) || sp>(USTKTOP-4*BY2WD))
-			validaddr(ur->sp, 4*BY2WD, 0);
-		ret = (*systab[r0])((ulong*)(sp+2*BY2WD));
+			validaddr(sp, 4*BY2WD, 0);
+		ret = (*systab[r0])((ulong*)(sp+BY2WD));
 	}
 	u->nerrlab = 0;
 	u->p->insyscall = 0;
diff --git a/port/chan.c b/port/chan.c
index 0822cf250e4ec42aede3535030603af913905365..374bd4e1cb8c2b82f1ac78eca627093856bc8737 100644
--- a/port/chan.c
+++ b/port/chan.c
@@ -490,10 +490,8 @@ namec(char *name, int amode, int omode, ulong perm)
 
 	switch(amode){
 	case Aaccess:
-		if((nc=walk(c, elem, mntok)) == 0){
-			print("%d pc %lux\n", u->nerrlab, u->errlab[u->nerrlab-1].pc);
+		if((nc=walk(c, elem, mntok)) == 0)
 			error(0, Enonexist);
-		}
 		c = nc;
 		break;
 
diff --git a/port/devbit.c b/port/devbit.c
index 69d180167cbb303534ef4c4eab2521e521cac369..7af2e66bd3785cf0963c613d2b8bd79a23880264 100644
--- a/port/devbit.c
+++ b/port/devbit.c
@@ -26,7 +26,6 @@ extern Font	defont0;	/* BUG */
 
 struct{
 	Ref;
-	int	bltuse;
 	Bitmap	*map;		/* arena */
 	Bitmap	*free;		/* free list */
 	ulong	*words;		/* storage */
@@ -148,7 +147,6 @@ void
 bitinit(void)
 {
 	lock(&bit);
-	bit.bltuse = 0;
 	unlock(&bit);
 	cursoron(1);
 }
@@ -185,9 +183,9 @@ bitopen(Chan *c, int omode)
 	if(c->qid == CHDIR){
 		if(omode != OREAD)
 			error(0, Eperm);
-	}else{
+	}else if(c->qid == Qbitblt){
 		lock(&bit);
-		if(bit.bltuse){
+		if(bit.ref){
 			unlock(&bit);
 			error(0, Einuse);
 		}
@@ -232,7 +230,6 @@ bitclose(Chan *c)
 			for(i=1,bp=&bit.map[1]; i<conf.nbitmap; i++,bp++)
 				if(bp->ldepth >= 0)
 					bitfree(bp);
-			bit.bltuse = 0;
 		}
 		unlock(&bit);
 	}
diff --git a/power/trap.c b/power/trap.c
index 3a93435c57798f59ce4f0d77db8ef9c0df447185..ec39d29921e7534febfc7cf60821ccaee31f91d4 100644
--- a/power/trap.c
+++ b/power/trap.c
@@ -451,7 +451,7 @@ syscall(Ureg *aur)
 			goto Bad;
 		}
 		if(sp<(USTKTOP-BY2PG) || sp>(USTKTOP-4*BY2WD))
-			validaddr(ur->sp, 4*BY2WD, 0);
+			validaddr(sp, 4*BY2WD, 0);
 		ret = (*systab[r1])((ulong*)(sp+2*BY2WD));
 	}
 	ur->pc += 4;