* generic/tclIOUtil.c (TclGetOpenMode): Only set the O_APPEND flag

	* tests/ioUtil.test (ioUtil-4.1):	on a channel for the 'a'
	mode and not for 'a+'. [Bug 1773127] (backport from HEAD)

1 files changed, 22 insertions, 1 deletions

diff --git a/tests/ioUtil.test b/tests/ioUtil.test
index 5b0a79e..78df642 100644
--- a/tests/ioUtil.test
+++ b/tests/ioUtil.test
@@ -8,7 +8,7 @@
 # See the file "license.terms" for information on usage and redistribution 
 # of this file, and for a DISCLAIMER OF ALL WARRANTIES. 
 # 
-# RCS: @(#) $Id: ioUtil.test,v 1.13.2.1 2003/04/14 15:45:57 vincentdarley Exp $
+# RCS: @(#) $Id: ioUtil.test,v 1.13.2.2 2007/12/14 02:29:22 hobbs Exp $
  
 if {[lsearch [namespace children] ::tcltest] == -1} {
     package require tcltest 2
@@ -303,6 +303,27 @@ test ioUtil-3.8 {TclOpenFileChannelDeleteProc: Verify that all procs have been d
     list $err9 $err10 $err11
 } {{"TestOpenFileChannelProc1": could not be deleteed} {"TestOpenFileChannelProc2": could not be deleteed} {"TestOpenFileChannelProc3": could not be deleteed}}
 
+test ioUtil-4.1 {open ... a+ must not use O_APPEND: Bug 1773127} -setup {
+    set f [tcltest::makeFile {} ioutil41.tmp]
+    set fid [open $f w]
+    puts -nonewline $fid 123
+    close $fid
+} -body {
+    set fid [open $f a+]
+    puts -nonewline $fid 456
+    seek $fid 2
+    set d [read $fid 2]
+    seek $fid 4
+    puts -nonewline $fid x
+    close $fid
+    set fid [open $f r]
+    append d [read $fid]
+    close $fid
+    return $d
+} -cleanup {
+    tcltest::removeFile $f
+} -result 341234x6
+
 cd $oldpwd
 
 # cleanup