From 385a811b02e63d28370caf0977d27948269c63e1 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Wed, 26 Feb 1992 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1992-02-26

---
 port/devcons.c | 4 +---
 port/devroot.c | 2 +-
 port/devsrv.c  | 5 +++++
 port/fault.c   | 1 -
 4 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/port/devcons.c b/port/devcons.c
index 840254e0cf6b4dc8d27cc180a35d35d6e4e559c2..024d13c2a274b0ac1a32005affc1c4c58a341e7a 100644
--- a/port/devcons.c
+++ b/port/devcons.c
@@ -448,9 +448,6 @@ consopen(Chan *c, int omode)
 			error(Eperm);
 		incref(&ctl);
 		break;
-	case Qswap:
-		kickpager();		/* start a pager if not already started */
-		break;
 	}
 	c->aux = 0;
 	return devopen(c, omode, consdir, NCONS, devgen);
@@ -850,6 +847,7 @@ conswrite(Chan *c, void *va, long n, ulong offset)
 		break;
 
 	case Qswap:
+		kickpager();		/* start a pager if not already started */
 		if(conf.cntrlp && strcmp(u->p->user, eve) != 0)
 			error(Eperm);
 		if(n >= sizeof buf)
diff --git a/port/devroot.c b/port/devroot.c
index 1050768b9bfd2f0d5537530162e17a269d02ddc1..d8bb79a9a99211b6cb166d0c07bf73811761e638 100644
--- a/port/devroot.c
+++ b/port/devroot.c
@@ -95,7 +95,7 @@ rootwalk(Chan *c, char *name)
 		return 1;
 	}
 	if((c->qid.path & ~CHDIR) != Qdir)
-		error(Enonexist);
+		return 0;
 	return devwalk(c, name, rootdir, nroot, rootgen);
 }
 
diff --git a/port/devsrv.c b/port/devsrv.c
index 0486b6fd2dcc73ad2a726a578bec6c8e472a263a..49b81faa3594bed4cc70b362e969557f9d70c091 100644
--- a/port/devsrv.c
+++ b/port/devsrv.c
@@ -199,9 +199,14 @@ srvwrite(Chan *c, void *va, long n, ulong offset)
 	fd = strtoul(buf, 0, 0);
 	f = u->p->fgrp;
 	lock(f);
+	if(waserror()){
+		unlock(f);
+		nexterror();
+	}
 	fdtochan(fd, -1, 0);	/* error check only */
 	srv[i].chan = f->fd[fd];
 	incref(srv[i].chan);
 	unlock(f);
+	poperror();
 	return n;
 }
diff --git a/port/fault.c b/port/fault.c
index 75fbb02fef2d36fef75c8e1ced23768c5e4ac313..b2b8303cbee020df56958bf34514da7daa0c7568 100644
--- a/port/fault.c
+++ b/port/fault.c
@@ -280,7 +280,6 @@ validaddr(ulong addr, ulong len, int write)
 	}
 
 	pprint("invalid address 0x%lux in sys call pc=0x%lux", addr, userpc());
-	postnote(u->p, 1, "sys: bad address", NDebug);
 	error(Ebadarg);
 }