From 13850d4952b34d30e3e2ae68c3cb2c10c0019737 Mon Sep 17 00:00:00 2001
From: dgp <dgp@users.sourceforge.net>
Date: Thu, 13 Aug 2015 16:45:03 +0000
Subject: A bit of code safety, and then a test demonstrating next issue.

---
 generic/tclIORChan.c |  5 +++-
 tests/io.test        | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/generic/tclIORChan.c b/generic/tclIORChan.c
index 6592f9e..85a35b8 100644
--- a/generic/tclIORChan.c
+++ b/generic/tclIORChan.c
@@ -753,8 +753,11 @@ CallNotify(
     int flags)
 {
     PostEvent *pevPtr = (PostEvent *)evPtr;
+    Channel *chanPtr = (Channel *)pevPtr->chan;
 
-    Tcl_NotifyChannel(pevPtr->chan, pevPtr->events);
+    if (chanPtr->typePtr != NULL) {
+	Tcl_NotifyChannel(pevPtr->chan, pevPtr->events);
+    }
     TclChannelRelease(pevPtr->chan);
     return 1;
 }
diff --git a/tests/io.test b/tests/io.test
index 46e3f05..840274d 100644
--- a/tests/io.test
+++ b/tests/io.test
@@ -7936,7 +7936,7 @@ test io-53.18 {[32ae34e63a] recursize CopyData} -setup {
     # Different encoding to force use of DoReadChars()
     chan configure $outChan -encoding iso8859-1
 } -body {
-    after 2000 {set ::done timeout}
+    after 100 {set ::done timeout}
     chan copy $c $outChan -size 99 -command [list [namespace which more] $c $outChan]
     vwait ::done
     set ::done
@@ -7948,6 +7948,68 @@ test io-53.18 {[32ae34e63a] recursize CopyData} -setup {
     unset ::done
 } -result eof
 
+test io-53.19 {[e0a7b3e5f8] DoRead calls to UpdateInterest} -setup {
+    proc driver {cmd args} {
+        variable buffer
+        variable index
+        set chan [lindex $args 0]
+        switch -- $cmd {
+            initialize {
+                set index($chan) 0
+                set buffer($chan) [encoding convertto utf-8 \
+                        [string repeat a 100]]
+                return {initialize finalize watch read}
+            }
+            finalize {
+                unset index($chan) buffer($chan)
+                return
+            }
+            watch {
+                if {"read" in [lindex $args 1]} {
+                    chan postevent $chan read
+                }
+                return
+            }
+            read {
+                set n [lindex $args 1]
+                set new [expr {$index($chan) + $n}]
+                set result [string range $buffer($chan) $index($chan) $new-1]
+                set index($chan) $new
+                return $result
+            }
+        }
+    }
+    proc more {c outChan bytes args} {
+        if {[eof $c]} {
+            set ::done eof
+            catch {close $c}
+            return
+        }
+        if {[llength $args]} {
+            set ::done error
+        } else  {
+            chan copy $c $outChan -size 30 -command [list [namespace which more] $c $outChan]
+        }
+    }
+    set c [chan create read [namespace which driver]]
+    chan configure $c -encoding utf-8 -buffersize 20
+    set out [makeFile {} out]
+    set outChan [open $out w]
+    # Different encoding to force use of DoReadChar()
+    chan configure $outChan -encoding iso8859-1
+} -body {
+    after 100 {set ::done timeout}
+    chan copy $c $outChan -size 30 -command [list [namespace which more] $c $outChan]
+    vwait ::done
+    set ::done
+} -cleanup {
+    catch {close $outChan}
+    removeFile out
+    rename driver {}
+    rename more {}
+    unset ::done
+} -result eof
+
 test io-54.1 {Recursive channel events} {socket fileevent} {
     # This test checks to see if file events are delivered during recursive
     # event loops when there is buffered data on the channel.
-- 
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