diff --git a/check.t b/check.t
index 60f2e86..d438482 100644
--- a/check.t
+++ b/check.t
@@ -1,4 +1,4 @@
-# $MirOS: src/bin/mksh/check.t,v 1.258 2009/03/15 16:13:37 tg Exp $
+# $MirOS: src/bin/mksh/check.t,v 1.259 2009/03/16 15:14:22 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 R36 2009/03/15
+	@(#)MIRBSD KSH R36 2009/03/16 ~test
 description:
 	Check version of shell.
 stdin:
diff --git a/exec.c b/exec.c
index 8267587..8519c04 100644
--- a/exec.c
+++ b/exec.c
@@ -2,7 +2,7 @@
 
 #include "sh.h"
 
-__RCSID("$MirOS: src/bin/mksh/exec.c,v 1.48 2008/12/13 17:02:13 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/exec.c,v 1.49 2009/03/16 15:14:23 tg Exp $");
 
 static int comexec(struct op *, struct tbl *volatile, const char **,
     int volatile);
@@ -25,6 +25,8 @@ execute(struct op *volatile t,
 {
 	int i;
 	volatile int rv = 0;
+	/* for FPOSIX only: rv being propagated or newly defined? */
+	volatile bool rv_prop = false;
 	int pv[2];
 	const char ** volatile ap;
 	char ** volatile up;
@@ -100,6 +102,7 @@ execute(struct op *volatile t,
 
 	case TPAREN:
 		rv = execute(t->left, flags|XFORK);
+		rv_prop = true;
 		break;
 
 	case TPIPE:
@@ -207,9 +210,10 @@ execute(struct op *volatile t,
 	case TOR:
 	case TAND:
 		rv = execute(t->left, XERROK);
-		if (t->right != NULL && (rv == 0) == (t->type == TAND))
+		if (t->right != NULL && (rv == 0) == (t->type == TAND)) {
 			rv = execute(t->right, flags & XERROK);
-		else
+			rv_prop = true;
+		} else
 			flags |= XERROK;
 		break;
 
@@ -254,6 +258,7 @@ execute(struct op *volatile t,
 			}
 		}
 		rv = 0; /* in case of a continue */
+		rv_prop = true;
 		if (t->type == TFOR) {
 			while (*ap != NULL) {
 				setstr(global(t->str), *ap++, KSH_UNWIND_ERROR);
@@ -263,6 +268,7 @@ execute(struct op *volatile t,
 			for (;;) {
 				if (!(cp = do_selectargs(ap, is_first))) {
 					rv = 1;
+					rv_prop = false;
 					break;
 				}
 				is_first = false;
@@ -292,6 +298,7 @@ execute(struct op *volatile t,
 		rv = 0; /* in case of a continue */
 		while ((execute(t->left, XERROK) == 0) == (t->type == TWHILE))
 			rv = execute(t->right, flags & XERROK);
+		rv_prop = true;
 		break;
 
 	case TIF:
@@ -301,6 +308,7 @@ execute(struct op *volatile t,
 		rv = execute(t->left, XERROK) == 0 ?
 		    execute(t->right->left, flags & XERROK) :
 		    execute(t->right->right, flags & XERROK);
+		rv_prop = true;
 		break;
 
 	case TCASE:
@@ -313,10 +321,12 @@ execute(struct op *volatile t,
 		break;
  Found:
 		rv = execute(t->left, flags & XERROK);
+		rv_prop = true;
 		break;
 
 	case TBRACE:
 		rv = execute(t->left, flags & XERROK);
+		rv_prop = true;
 		break;
 
 	case TFUNCT:
@@ -328,6 +338,7 @@ execute(struct op *volatile t,
 		 * (allows "ls -l | time grep foo").
 		 */
 		rv = timex(t, flags & ~XEXEC);
+		rv_prop = true;
 		break;
 
 	case TEXEC:		/* an eval'd TCOM */
@@ -353,7 +364,7 @@ execute(struct op *volatile t,
 	quitenv(NULL);		/* restores IO */
 	if ((flags&XEXEC))
 		unwind(LEXIT);	/* exit child */
-	if (rv != 0 && !(flags & XERROK)) {
+	if (rv != 0 && (!Flag(FPOSIX) || !rv_prop) &&!(flags & XERROK)) {
 		trapsig(SIGERR_);
 		if (Flag(FERREXIT))
 			unwind(LERROR);
diff --git a/sh.h b/sh.h
index cd8b8ea..76bb165 100644
--- a/sh.h
+++ b/sh.h
@@ -102,9 +102,9 @@
 #define __SCCSID(x)	__IDSTRING(sccsid,x)
 
 #ifdef EXTERN
-__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.276 2009/03/15 16:13:40 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.277 2009/03/16 15:14:23 tg Exp $");
 #endif
-#define MKSH_VERSION "R36 2009/03/15"
+#define MKSH_VERSION "R36 2009/03/16 ~test"
 
 #ifndef MKSH_INCLUDES_ONLY