diff --git a/CHANGES b/CHANGES
index 14ac8eb..bcee6cc 100644
--- a/CHANGES
+++ b/CHANGES
@@ -17,6 +17,11 @@ corrections:
 	Option so-reuseport did not work. Thanks to Some Raghavendra Prabhu
 	for sending a patch.
 
+	Programs invoked with EXEC, nofork, and -u or -U had stdin and stdout
+	incorrectly assigned
+	Test: EXEC_NOFORK_UNIDIR
+	Thanks to David Reiss for reporting this problem.
+
 porting:
 	Type conflict between int and sig_atomic_t between declaration and
 	definition of diag_immediate_type and diag_immediate_exit broke
diff --git a/test.sh b/test.sh
index 75194af..66c4995 100755
--- a/test.sh
+++ b/test.sh
@@ -12383,6 +12383,39 @@ fi # NUMCOND, SO_REUSEPORT
  ;;
 esac
 PORT=$((PORT+1))
+
+
+# Programs invoked with EXEC, nofork, and -u or -U had stdin and stdout assignment swapped. 
+NAME=EXEC_NOFORK_UNIDIR
+case "$TESTS" in
+*%$N%*|*%functions%*|*%bugs%*|*%exec%*|*%$NAME%*)
+TEST="$NAME: Programs invoked with EXEC, nofork, and -u or -U had stdin and stdout assignment swapped"
+# invoke a simple echo command with EXEC, nofork, and -u
+# expected behaviour: output appears on stdout
+if ! eval $NUMCOND; then :; else
+tf="$td/test$N.stdout"
+te="$td/test$N.stderr"
+tdiff="$td/test$N.diff"
+da="test$N $(date) $RANDOM"
+CMD0="$TRACE $SOCAT $opts -u /dev/null EXEC:\"echo \\\"$da\\\"\",nofork"
+printf "test $F_n $TEST... " $N
+eval $CMD0 >"${tf}0" 2>"${te}0"
+rc1=$?
+if echo "$da" |diff - "${tf}0" >"$tdiff"; then
+    $PRINTF "$OK\n"
+    numOK=$((numOK+1))
+else
+    $PRINTF "$FAILED\n"
+    echo "$CMD0"
+    cat "${te}0"
+    cat "$tdiff"
+    numFAIL=$((numFAIL+1))
+    listFAIL="$listFAIL $N"
+fi
+fi # NUMCOND
+ ;;
+esac
+#PORT=$((PORT+1))
 N=$((N+1))
 
 
diff --git a/xio-progcall.c b/xio-progcall.c
index 1ad91b0..2ee7721 100644
--- a/xio-progcall.c
+++ b/xio-progcall.c
@@ -168,40 +168,32 @@ int _xioopen_foxec(int xioflags,	/* XIO_RDONLY etc. */
       }
 #endif
 
+      /* remember: fdin is the fs where the sub program reads from, thus it is
+	 sock0[]'s read fd */
       /*! problem: when fdi==WRFD(sock[0]) or fdo==RDFD(sock[0]) */
       if (rw != XIO_WRONLY) {
-	 if (XIO_GETRDFD(sock[0]/*!!*/) == fdi) {
-	    if (Fcntl_l(fdi, F_SETFD, 0) < 0) {
-	       Warn2("fcntl(%d, F_SETFD, 0): %s", fdi, strerror(errno));
-	    }
-	    if (Dup2(XIO_GETRDFD(sock[0]), fdi) < 0) {
-	       Error3("dup2(%d, %d): %s",
-		      XIO_GETRDFD(sock[0]), fdi, strerror(errno));
-	    }
-	    /*0 Info2("dup2(%d, %d)", XIO_GETRDFD(sock[0]), fdi);*/
-	 } else {
-	    if (Dup2(XIO_GETRDFD(sock[0]), fdi) < 0) {
-	       Error3("dup2(%d, %d): %s",
-		      XIO_GETRDFD(sock[0]), fdi, strerror(errno));
-	    }
-	    /*0 Info2("dup2(%d, %d)", XIO_GETRDFD(sock[0]), fdi);*/
-	 }
-      }
-      if (rw != XIO_RDONLY) {
-	 if (XIO_GETWRFD(sock[0]) == fdo) {
+	 if (XIO_GETWRFD(sock[0]/*!!*/) == fdo) {
 	    if (Fcntl_l(fdo, F_SETFD, 0) < 0) {
 	       Warn2("fcntl(%d, F_SETFD, 0): %s", fdo, strerror(errno));
 	    }
-	    if (Dup2(XIO_GETWRFD(sock[0]), fdo) < 0) {
-	       Error3("dup2(%d, %d): %s)",
-		      XIO_GETWRFD(sock[0]), fdo, strerror(errno));
-	    }
-	    /*0 Info2("dup2(%d, %d)", XIO_GETWRFD(sock[0]), fdo);*/
 	 } else {
 	    if (Dup2(XIO_GETWRFD(sock[0]), fdo) < 0) {
-	       Error3("dup2(%d, %d): %s)",
+	       Error3("dup2(%d, %d): %s",
 		      XIO_GETWRFD(sock[0]), fdo, strerror(errno));
 	    }
+	 }
+	 /*0 Info2("dup2(%d, %d)", XIO_GETRDFD(sock[0]), fdi);*/
+      }
+      if (rw != XIO_RDONLY) {
+	 if (XIO_GETRDFD(sock[0]) == fdi) {
+	    if (Fcntl_l(fdi, F_SETFD, 0) < 0) {
+	       Warn2("fcntl(%d, F_SETFD, 0): %s", fdi, strerror(errno));
+	    }
+	 } else {
+	    if (Dup2(XIO_GETRDFD(sock[0]), fdi) < 0) {
+	       Error3("dup2(%d, %d): %s)",
+		      XIO_GETRDFD(sock[0]), fdi, strerror(errno));
+	    }
 	    /*0 Info2("dup2(%d, %d)", XIO_GETWRFD(sock[0]), fdo);*/
 	 }
       }
diff --git a/xioopen.c b/xioopen.c
index 7f55227..dbb6568 100644
--- a/xioopen.c
+++ b/xioopen.c
@@ -352,12 +352,6 @@ static xiofile_t *xioallocfd(void) {
 /* fd->stream.para.exec.pid = 0; */
    fd->stream.lineterm  = LINETERM_RAW;
 
-   /*!! support n socks */
-   if (!sock[0]) {
-      sock[0] = fd;
-   } else {
-      sock[1] = fd;
-   }
    return fd;
 }
 
@@ -376,6 +370,12 @@ xiofile_t *xioopen(const char *addr,	/* address specification */
    if ((xfd = xioparse_dual(&addr)) == NULL) {
       return NULL;
    }
+   /*!! support n socks */
+   if (!sock[0]) {
+      sock[0] = xfd;
+   } else {
+      sock[1] = xfd;
+   }
    if (xioopen_dual(xfd, xioflags) < 0) {
       /*!!! free something? */
       return NULL;