From 950cbf2bf3957fe2310521aeb612ac138f723c7a Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Sun, 16 Jan 2000 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 2000-01-16

---
 ip/devip.c  | 31 ++++++++++++++++++++++++++++---
 ip/ip.h     |  2 ++
 port/proc.c |  2 +-
 3 files changed, 31 insertions(+), 4 deletions(-)

diff --git a/ip/devip.c b/ip/devip.c
index bf84ede87d6f12c478ea279b97998496da4b5286..d5bc2a10e07973d686474e3d7b93162429be32f5 100644
--- a/ip/devip.c
+++ b/ip/devip.c
@@ -12,6 +12,7 @@ enum
 	Qtopbase,
 	Qarp=		Qtopbase,
 	Qbootp,
+	Qndb,
 	Qiproute,
 	Qiprouter,
 	Qipselftab,
@@ -54,8 +55,9 @@ QLock	fslock;
 Fs	*ipfs[Nfs];	/* attached fs's */
 Queue	*qlog;
 
-extern void nullmediumlink(void);
-extern void pktmediumlink(void);
+extern	void nullmediumlink(void);
+extern	void pktmediumlink(void);
+	long ndbwrite(Fs *f, char *a, ulong off, int n);
 
 static int
 ip3gen(Chan *c, int i, Dir *dp)
@@ -138,6 +140,10 @@ ip1gen(Chan *c, int i, Dir *dp)
 		p = "bootp";
 		q = (Qid){QID(0, 0, Qbootp), 0};
 		break;
+	case Qndb:
+		p = "ndb";
+		q = (Qid){QID(0, 0, Qndb), 0};
+		break;
 	case Qiproute:
 		p = "iproute";
 		q = (Qid){QID(0, 0, Qiproute), 0};
@@ -189,6 +195,7 @@ ipgen(Chan *c, Dirtab*, int, int s, Dir *dp)
 		return ip1gen(c, s+Qtopbase, dp);
 	case Qarp:
 	case Qbootp:
+	case Qndb:
 	case Qlog:
 	case Qiproute:
 	case Qiprouter:
@@ -550,6 +557,8 @@ ipread(Chan *ch, void *a, long n, vlong off)
 		return arpread(f->arp, a, offset, n);
  	case Qbootp:
  		return bootpread(a, offset, n);
+ 	case Qndb:
+		return readstr(offset, a, n, f->ndb);
 	case Qiproute:
 		return routeread(f, a, offset, n);
 	case Qipselftab:
@@ -883,7 +892,7 @@ ttlctlmsg(Conv *c, Cmdbuf *cb)
 }
 
 static long
-ipwrite(Chan* ch, void *v, long n, vlong)
+ipwrite(Chan* ch, void *v, long n, vlong off)
 {
 	Conv *c;
 	Proto *x;
@@ -892,6 +901,7 @@ ipwrite(Chan* ch, void *v, long n, vlong)
 	uchar ia[IPaddrlen], ma[IPaddrlen];
 	Fs *f;
 	char *a;
+	ulong offset = off;
 
 	a = v;
 	f = ipfs[ch->dev];
@@ -918,6 +928,9 @@ ipwrite(Chan* ch, void *v, long n, vlong)
 		if(p != nil)
 			error(p);
 		return n;
+	case Qndb:
+		return ndbwrite(f, a, offset, n);
+		break;
 	case Qctl:
 		x = f->p[PROTO(ch->qid)];
 		c = x->conv[CONV(ch->qid)];
@@ -1203,3 +1216,15 @@ Fsnewcall(Conv *c, uchar *raddr, ushort rport, uchar *laddr, ushort lport)
 
 	return nc;
 }
+
+long
+ndbwrite(Fs *f, char *a, ulong off, int n)
+{
+	if(off != 0)
+		error(Eio);
+	if(n >= sizeof(f->ndb))
+		error(Eio);
+	memmove(f->ndb, a, n);
+	f->ndb[n] = 0;
+	return n;
+}
diff --git a/ip/ip.h b/ip/ip.h
index 0314ea374420fc28afd58282e2533c58eaa63b1b..2bee2c75349bc1d4bb5c256544968522895248ab 100644
--- a/ip/ip.h
+++ b/ip/ip.h
@@ -265,6 +265,8 @@ struct Fs
 
 	Netlog	*alog;
 	Ifclog	*ilog;
+
+	char	ndb[1024];		/* an ndb entry for this interface */
 };
 
 int	Fsconnected(Conv*, char*);
diff --git a/port/proc.c b/port/proc.c
index 1bc5d9a229b345e7b8bd89665eacba10102bb341..61fb03d44640663b37cb5f2a4287a7626dc9b62b 100644
--- a/port/proc.c
+++ b/port/proc.c
@@ -527,7 +527,7 @@ tsleep(Rendez *r, int (*fn)(void*), void *arg, int ms)
 	ulong when;
 	Proc *f, **l;
 
-	// avoid overflows at the cost of precision
+	/* avoid overflows at the cost of precision */
 	if(ms >= 1000000)
 		when = ms/(1000/HZ);
 	else