diff --git a/Build.sh b/Build.sh
index b271de3..b8ec4a5 100644
--- a/Build.sh
+++ b/Build.sh
@@ -1,5 +1,5 @@
 #!/bin/sh
-srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.311 2008/04/01 17:25:36 tg Exp $'
+srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.312 2008/04/01 20:40:20 tg Exp $'
 #-
 # Environment used: CC CFLAGS CPPFLAGS LDFLAGS LIBS NOWARN NROFF TARGET_OS
 # CPPFLAGS recognised:	MKSH_SMALL MKSH_ASSUME_UTF8 MKSH_NOPWNAM MKSH_NOVI
@@ -342,8 +342,6 @@ syllable)
 ULTRIX)
 	: ${CC=cc -YPOSIX}
 	CPPFLAGS="$CPPFLAGS -Dssize_t=int"
-	warn=' but might work. I think that I/O'
-	warn="$warn${nl}redirs are kaput: child affects parent"
 	;;
 UWIN*)
 	ccpc='-Yc,'
diff --git a/check.t b/check.t
index b3e4b91..814113a 100644
--- a/check.t
+++ b/check.t
@@ -1,4 +1,4 @@
-# $MirOS: src/bin/mksh/check.t,v 1.169 2008/04/01 17:25:37 tg Exp $
+# $MirOS: src/bin/mksh/check.t,v 1.170 2008/04/01 20:40:21 tg Exp $
 # $OpenBSD: bksl-nl.t,v 1.2 2001/01/28 23:04:56 niklas Exp $
 # $OpenBSD: history.t,v 1.5 2001/01/28 23:04:56 niklas Exp $
 # $OpenBSD: read.t,v 1.3 2003/03/10 03:48:16 david Exp $
@@ -7,7 +7,7 @@
 # http://www.research.att.com/~gsf/public/ifs.sh
 
 expected-stdout:
-	@(#)MIRBSD KSH R33 2008/03/28
+	@(#)MIRBSD KSH R33 2008/04/01
 description:
 	Check version of shell.
 category: pdksh
diff --git a/exec.c b/exec.c
index 90a95a1..aaab3ee 100644
--- a/exec.c
+++ b/exec.c
@@ -2,7 +2,7 @@
 
 #include "sh.h"
 
-__RCSID("$MirOS: src/bin/mksh/exec.c,v 1.39 2007/10/25 13:27:00 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/exec.c,v 1.40 2008/04/01 20:40:21 tg Exp $");
 
 static int comexec(struct op *, struct tbl *volatile, const char **,
     int volatile);
@@ -109,14 +109,14 @@ execute(struct op *volatile t,
 		e->savefd[1] = savefd(1);
 		while (t->type == TPIPE) {
 			openpipe(pv);
-			(void) ksh_dup2(pv[1], 1, false); /* stdout of curr */
+			ksh_dup2(pv[1], 1, false); /* stdout of curr */
 			/* Let exchild() close pv[0] in child
 			 * (if this isn't done, commands like
 			 *    (: ; cat /etc/termcap) | sleep 1
 			 *  will hang forever).
 			 */
 			exchild(t->left, flags|XPIPEO|XCCLOSE, pv[0]);
-			(void) ksh_dup2(pv[0], 0, false); /* stdin of next */
+			ksh_dup2(pv[0], 0, false); /* stdin of next */
 			closepipe(pv);
 			flags |= XPIPEI;
 			t = t->right;
diff --git a/main.c b/main.c
index 0bbbf41..aa85806 100644
--- a/main.c
+++ b/main.c
@@ -13,7 +13,7 @@
 #include <locale.h>
 #endif
 
-__RCSID("$MirOS: src/bin/mksh/main.c,v 1.94 2008/03/28 18:47:52 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/main.c,v 1.95 2008/04/01 20:40:21 tg Exp $");
 
 extern char **environ;
 
@@ -922,14 +922,19 @@ initio(void)
 
 /* A dup2() with error checking */
 int
-ksh_dup2(int ofd, int nfd, int errok)
+ksh_dup2(int ofd, int nfd, bool errok)
 {
-	int ret = dup2(ofd, nfd);
+	int rv;
 
-	if (ret < 0 && errno != EBADF && !errok)
+	if (((rv = dup2(ofd, nfd)) < 0) && !errok && (errno != EBADF))
 		errorf("too many files open in shell");
 
-	return ret;
+#ifdef __ultrix
+	if (rv >= 0)
+		fcntl(nfd, F_SETFD, 0);
+#endif
+
+	return (rv);
 }
 
 /*
diff --git a/misc.c b/misc.c
index fb7c2d9..5762747 100644
--- a/misc.c
+++ b/misc.c
@@ -6,7 +6,7 @@
 #include <grp.h>
 #endif
 
-__RCSID("$MirOS: src/bin/mksh/misc.c,v 1.69 2008/03/23 22:09:58 tg Exp $\t"
+__RCSID("$MirOS: src/bin/mksh/misc.c,v 1.70 2008/04/01 20:40:22 tg Exp $\t"
 	MKSH_SH_H_ID);
 
 #undef USE_CHVT
@@ -1380,9 +1380,9 @@ chvt(const char *fn)
 		errorf("chvt: setsid failed");
 	if ((fn != dv + 1) && ioctl(fd, TIOCSCTTY, NULL) == -1)
 		errorf("chvt: TIOCSCTTY failed");
-	dup2(fd, 0);
-	dup2(fd, 1);
-	dup2(fd, 2);
+	ksh_dup2(fd, 0, false);
+	ksh_dup2(fd, 1, false);
+	ksh_dup2(fd, 2, false);
 	if (fd > 2)
 		close(fd);
 }
diff --git a/sh.h b/sh.h
index c0da6d2..cf8df46 100644
--- a/sh.h
+++ b/sh.h
@@ -8,8 +8,8 @@
 /*	$OpenBSD: c_test.h,v 1.4 2004/12/20 11:34:26 otto Exp $	*/
 /*	$OpenBSD: tty.h,v 1.5 2004/12/20 11:34:26 otto Exp $	*/
 
-#define MKSH_SH_H_ID "$MirOS: src/bin/mksh/sh.h,v 1.199 2008/03/28 13:46:53 tg Exp $"
-#define MKSH_VERSION "R33 2008/03/28"
+#define MKSH_SH_H_ID "$MirOS: src/bin/mksh/sh.h,v 1.200 2008/04/01 20:40:22 tg Exp $"
+#define MKSH_VERSION "R33 2008/04/01"
 
 #if HAVE_SYS_PARAM_H
 #include <sys/param.h>
@@ -1384,7 +1384,7 @@ void shprintf(const char *, ...)
     __attribute__((format (printf, 1, 2)));
 int can_seek(int);
 void initio(void);
-int ksh_dup2(int, int, int);
+int ksh_dup2(int, int, bool);
 short savefd(int);
 void restfd(int, int);
 void openpipe(int *);