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-rw-r--r--generic/tclIOGT.c39
1 files changed, 18 insertions, 21 deletions
diff --git a/generic/tclIOGT.c b/generic/tclIOGT.c
index c5372b1..fe0a880 100644
--- a/generic/tclIOGT.c
+++ b/generic/tclIOGT.c
@@ -683,38 +683,35 @@ TransformInputProc(
read = Tcl_ReadRaw(downChan, buf, toRead);
if (read < 0) {
- /*
- * Report errors to caller. EAGAIN is a special situation. If we
- * had some data before we report that instead of the request to
- * re-try.
- */
- if ((Tcl_GetErrno() == EAGAIN) && (gotBytes > 0)) {
+ if (Tcl_InputBlocked(downChan) && (gotBytes > 0)) {
+ /*
+ * Zero bytes available from downChan because blocked.
+ * But nonzero bytes already copied, so total is a
+ * valid blocked short read. Return to caller.
+ */
+
break;
}
+ /*
+ * Either downChan is not blocked (there's a real error).
+ * or it is and there are no bytes copied yet. In either
+ * case we want to pass the "error" along to the caller,
+ * either to report an error, or to signal to the caller
+ * that zero bytes are available because blocked.
+ */
+
*errorCodePtr = Tcl_GetErrno();
gotBytes = -1;
break;
} else if (read == 0) {
+
/*
- * Check wether we hit on EOF in the underlying channel or not. If
- * not differentiate between blocking and non-blocking modes. In
- * non-blocking mode we ran temporarily out of data. Signal this
- * to the caller via EWOULDBLOCK and error return (-1). In the
- * other cases we simply return what we got and let the caller
- * wait for more. On the other hand, if we got an EOF we have to
- * convert and flush all waiting partial data.
+ * Zero returned from Tcl_ReadRaw() always indicates EOF
+ * on the down channel.
*/
- if (!Tcl_Eof(downChan)) {
- if ((gotBytes == 0) && (dataPtr->flags & CHANNEL_ASYNC)) {
- *errorCodePtr = EWOULDBLOCK;
- gotBytes = -1;
- }
- break;
- }
-
if (dataPtr->readIsFlushed) {
/*
* Already flushed, nothing to do anymore.