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-rw-r--r--generic/tclIORChan.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/generic/tclIORChan.c b/generic/tclIORChan.c
index 10d0b2e..b57d157 100644
--- a/generic/tclIORChan.c
+++ b/generic/tclIORChan.c
@@ -15,7 +15,7 @@
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
- * RCS: @(#) $Id: tclIORChan.c,v 1.29 2008/04/04 16:46:57 andreas_kupries Exp $
+ * RCS: @(#) $Id: tclIORChan.c,v 1.30 2008/04/04 17:18:31 andreas_kupries Exp $
*/
#include <tclInt.h>
@@ -434,6 +434,7 @@ static const char *msg_read_unsup = "{read not supported by Tcl driver}";
static const char *msg_read_toomuch = "{read delivered more than requested}";
static const char *msg_write_unsup = "{write not supported by Tcl driver}";
static const char *msg_write_toomuch = "{write wrote more than requested}";
+static const char *msg_write_nothing = "{write wrote nothing}";
static const char *msg_seek_beforestart = "{Tried to seek before origin}";
#ifdef TCL_THREADS
static const char *msg_send_originlost = "{Origin thread lost}";
@@ -1290,7 +1291,17 @@ ReflectOutput(
Tcl_DecrRefCount(resObj); /* Remove reference held from invoke */
- if ((written == 0) || (toWrite < written)) {
+ if ((written == 0) && (toWrite > 0)) {
+ /*
+ * The handler claims to have written nothing of what it was
+ * given. That is bad.
+ */
+
+ SetChannelErrorStr(rcPtr->chan, msg_write_nothing);
+ *errorCodePtr = EINVAL;
+ return -1;
+ }
+ if (toWrite < written) {
/*
* The handler claims to have written more than it was given. That is
* bad. Note that the I/O core would crash if we were to return this