Share the zygote's fopen overrides with nacl_helper.

content/zygote/zygote_libc_override_linux.h

Index: content/zygote/zygote_libc_override_linux.h
diff --git a/content/zygote/zygote_libc_override_linux.h b/content/zygote/zygote_libc_override_linux.h
new file mode 100644
index 0000000000000000000000000000000000000000..f3f5f52cfbf24a1748191efb2679db94bb01db84
--- /dev/null
+++ b/content/zygote/zygote_libc_override_linux.h
@@ -0,0 +1,19 @@
+// Copyright (c) 2012 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.
+
+#ifndef CONTENT_ZYGOTE_ZYGOTE_LIBC_OVERRIDE_LINUX_H_

[Sergey Ulanov, 2012/07/10 22:42:04]

not sure if this is the best location for this file. Might be better to put it
in content/common and remove zygote from the name (it's not zygote specific
now).

[Nick Bray (chromium), 2012/07/11 00:06:11]

Done.

+#define CONTENT_ZYGOTE_ZYGOTE_LIBC_OVERRIDE_LINUX_H_
+
+namespace content {
+
+#if !defined(CHROMIUM_SELINUX)
+
+// Used to control if calls to libc are intercepted or not.
+extern bool g_am_zygote_or_renderer;

[Sergey Ulanov, 2012/07/10 22:42:04]

instead of exposing this variable it's better to have a function that would set
this flag (e.g. InitUrandomLibcOverrides()) to make sure we don't reset it flag
to false by accident.

[Nick Bray (chromium), 2012/07/11 00:06:11]

Done.

+
+#endif

[Sergey Ulanov, 2012/07/10 22:42:04]

// !defined (CHROMIUM_SELINUX)

[Nick Bray (chromium), 2012/07/11 00:06:11]

Done.

+
+}

[Sergey Ulanov, 2012/07/10 22:42:04]

// namespace content

[Nick Bray (chromium), 2012/07/11 00:06:11]

Done.

+
+#endif  // CONTENT_ZYGOTE_ZYGOTE_LIBC_OVERRIDE_LINUX_H_