Fix [Bug 1773127]

1 files changed, 22 insertions, 1 deletions

diff --git a/tests/ioUtil.test b/tests/ioUtil.test
index c2894ce..8165a2e 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 1.17 2006/11/03 00:34:53 hobbs Exp $
+# RCS: @(#) $Id: ioUtil.test,v 1.18 2007/08/15 17:43:59 dkf Exp $
 
 if {[lsearch [namespace children] ::tcltest] == -1} {
     package require tcltest 2
@@ -301,6 +301,27 @@ 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 wb]
+    puts -nonewline $fid 123
+    close $fid
+} -body {
+    set fid [open $f ab+]
+    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 rb]
+    append d [read $fid]
+    close $fid
+    return $d
+} -cleanup {
+    tcltest::removeFile $f
+} -result 341234x6
+
 cd $oldpwd
 
 # cleanup