When checking for std channels being closed, compare the channel state,

not the channel itself so that stacked channels do not cause trouble.

2 files changed, 15 insertions, 5 deletions

diff --git a/ChangeLog b/ChangeLog
index 9f63bc1..ee36258 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2012-10-03  Don Porter  <dgp@users.sourceforge.net>
+
+	* generic/tclIO.c:	When checking for std channels being closed,
+	compare the channel state, not the channel itself so that stacked
+	channels do not cause trouble.
+
 2012-09-07  Harald Oehlmann  <oehhar@users.sf.net>
 
 	IMPLEMENTATION OF TIP#404.
diff --git a/generic/tclIO.c b/generic/tclIO.c
index eeca41b..e2415d8 100644
--- a/generic/tclIO.c
+++ b/generic/tclIO.c
@@ -748,21 +748,25 @@ CheckForStdChannelsBeingClosed(
     ChannelState *statePtr = ((Channel *) chan)->state;
     ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
 
-    if ((chan == tsdPtr->stdinChannel) && (tsdPtr->stdinInitialized)) {
+    if (tsdPtr->stdinInitialized
+	    && tsdPtr->stdinChannel != NULL
+	    && statePtr == ((Channel *)tsdPtr->stdinChannel)->state) {
 	if (statePtr->refCount < 2) {
 	    statePtr->refCount = 0;
 	    tsdPtr->stdinChannel = NULL;
 	    return;
 	}
-    } else if ((chan == tsdPtr->stdoutChannel)
-	    && (tsdPtr->stdoutInitialized)) {
+    } else if (tsdPtr->stdoutInitialized
+	    && tsdPtr->stdoutChannel != NULL
+	    && statePtr == ((Channel *)tsdPtr->stdoutChannel)->state) {
 	if (statePtr->refCount < 2) {
 	    statePtr->refCount = 0;
 	    tsdPtr->stdoutChannel = NULL;
 	    return;
 	}
-    } else if ((chan == tsdPtr->stderrChannel)
-	    && (tsdPtr->stderrInitialized)) {
+    } else if (tsdPtr->stderrInitialized
+	    && tsdPtr->stderrChannel != NULL
+	    && statePtr == ((Channel *)tsdPtr->stderrChannel)->state) {
 	if (statePtr->refCount < 2) {
 	    statePtr->refCount = 0;
 	    tsdPtr->stderrChannel = NULL;