Add non-blocking peek for the syncsocket...

base/sync_socket_win.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/sync_socket.h"
 #include <limits.h>
 #include <stdio.h>
 #include <windows.h>
 #include <sys/types.h>
 #include "base/atomicops.h"
@@ skipping 123 matching lines @@
       ((length - count) <= UINT_MAX) ? (length - count) : UINT_MAX);
     if (ReadFile(handle_, static_cast<char*>(buffer) + count,
                  chunk, &len, NULL) == FALSE) {
       return (0 < count) ? count : 0;
     }
     count += len;
   }
   return count;
 }
 
+size_t SyncSocket::Peek() {
+  DWORD available = 0;
+  PeekNamedPipe(handle_, NULL, 0, NULL, &available, NULL);
+  return available;
+}
+
 }  // namespace base