From 5358c9fbc25f9e587be82bf5a12e5c4007fd2a1f Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 18 May 2017 14:48:00 +0200
Subject: Fix bug

---
 msvc-common/msvc-filter.cxx | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/msvc-common/msvc-filter.cxx b/msvc-common/msvc-filter.cxx
index 9146760..63c1fd1 100644
--- a/msvc-common/msvc-filter.cxx
+++ b/msvc-common/msvc-filter.cxx
@@ -323,7 +323,7 @@ try
 
     // Proxy the data if requested.
     //
-    if (FD_ISSET (isp.fd (), &rd))
+    if (isp.is_open () && FD_ISSET (isp.fd (), &rd))
     {
       for (;;)
       {
@@ -349,7 +349,7 @@ try
 
     // Read & filter.
     //
-    if (FD_ISSET (isf.fd (), &rd))
+    if (isf.is_open () && FD_ISSET (isf.fd (), &rd))
     {
       for (;;)
       {
-- 
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