fix endless loop in QProcess/Win drainOutputPipes

Commit 568f82fba397e06a26b4fd40f074e4432d02d248 was incomplete.
If drainOutputPipes detected some readyRead it wouldn't end the loop.

Task-number: QTBUG-32354

Change-Id: I4e594f1e148abe9ef36c047a55eee1b22fd5064b
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/src/corelib/io/qprocess_win.cpp b/src/corelib/io/qprocess_win.cpp
index bcc3fe0b0d..f16025752e 100644
--- a/src/corelib/io/qprocess_win.cpp
+++ b/src/corelib/io/qprocess_win.cpp
@@ -630,8 +630,9 @@ bool QProcessPrivate::drainOutputPipes()
     if (!stdoutReader && !stderrReader)
         return false;
 
-    bool readyReadEmitted = false;
+    bool someReadyReadEmitted = false;
     forever {
+        bool readyReadEmitted = false;
         bool readOperationActive = false;
         if (stdoutReader) {
             readyReadEmitted |= stdoutReader->waitForReadyRead(0);
@@ -641,12 +642,13 @@ bool QProcessPrivate::drainOutputPipes()
             readyReadEmitted |= stderrReader->waitForReadyRead(0);
             readOperationActive |= stderrReader->isReadOperationActive();
         }
+        someReadyReadEmitted |= readyReadEmitted;
         if (!readOperationActive || !readyReadEmitted)
             break;
         Sleep(100);
     }
 
-    return readyReadEmitted;
+    return someReadyReadEmitted;
 }
 
 bool QProcessPrivate::waitForReadyRead(int msecs)