From 2e9194366ab14876eaf9f689fe0808fc68477701 Mon Sep 17 00:00:00 2001
From: ferrieux <ferrieux@users.sourceforge.net>
Date: Thu, 24 Aug 2017 16:56:51 +0000
Subject: Fix [b50fb214] : add to 2>> the same O_APPEND that was added to >>
 back in 2005.

---
 generic/tclPipe.c | 8 +++++++-
 tests/exec.test   | 8 ++++++--
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/generic/tclPipe.c b/generic/tclPipe.c
index d6cd188..b679ec4 100644
--- a/generic/tclPipe.c
+++ b/generic/tclPipe.c
@@ -668,7 +668,13 @@ TclCreatePipeline(
 	    if (*p == '>') {
 		p++;
 		atOK = 0;
-		flags = O_WRONLY | O_CREAT;
+
+		/*
+		 * Note that the O_APPEND flag only has an effect on POSIX
+		 * platforms. On Windows, we just have to carry on regardless.
+		 */
+
+		flags = O_WRONLY | O_CREAT | O_APPEND;
 	    }
 	    if (errorClose != 0) {
 		errorClose = 0;
diff --git a/tests/exec.test b/tests/exec.test
index 2a4b31e..dffd960 100644
--- a/tests/exec.test
+++ b/tests/exec.test
@@ -671,8 +671,12 @@ test exec-19.1 {exec >> uses O_APPEND} -constraints {exec unix} -setup {
     exec /bin/sh -c \
 	    {for a in 1 2 3; do sleep 1; echo $a; done} >>$tmpfile &
     exec /bin/sh -c \
+	    {for a in 4 5 6; do sleep 1; echo $a >&2; done} 2>>$tmpfile &
+    exec /bin/sh -c \
 	    {for a in a b c; do sleep 1; echo $a; done} >>$tmpfile &
-    # The above two shell invokations take about 3 seconds to finish, so allow
+    exec /bin/sh -c \
+	    {for a in d e f; do sleep 1; echo $a >&2; done} 2>>$tmpfile &
+    # The above four shell invokations take about 3 seconds to finish, so allow
     # 5s (in case the machine is busy)
     after 5000
     # Check that no bytes have got lost through mixups with overlapping
@@ -681,7 +685,7 @@ test exec-19.1 {exec >> uses O_APPEND} -constraints {exec unix} -setup {
     file size $tmpfile
 } -cleanup {
     removeFile $tmpfile
-} -result 14
+} -result 26
 
 # Tests to ensure batch files and .CMD (Bug 9ece99d58b)
 # can be executed on Windows
-- 
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