Initial implementation of the Mac Bootstrap Sandbox.

sandbox/mac/os_compatibility.h

Index: sandbox/mac/os_compatibility.h
diff --git a/sandbox/mac/os_compatibility.h b/sandbox/mac/os_compatibility.h
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+// Copyright 2014 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.
+
+// This file is used to handle differences in Mach message IDs and structures
+// that occur between different OS versions. The Mach messages that the sandbox
+// is interested in are decoded using information derived from the open-source
+// libraries, i.e. <http://www.opensource.apple.com/source/launchd/>. While
+// these messages definitions are open source, they are not considered part of
+// the stable OS API, and so differences do exist between OS versions.
+
+#ifndef SANDBOX_MAC_OS_COMPATIBILITY_H_
+#define SANDBOX_MAC_OS_COMPATIBILITY_H_
+
+#include <mach/mach.h>
+
+#include <string>
+
+namespace sandbox {
+
+typedef std::string (*LookUp2GetRequestName)(const mach_msg_header_t*);
+typedef void (*LookUp2FillReply)(mach_msg_header_t*, mach_port_t service_port);
+
+struct LaunchdCompatibilityShim {
+  // The msgh_id for look_up2.
+  mach_msg_id_t msg_id_look_up2;
+
+  // The msgh_id for swap_integer.
+  mach_msg_id_t msg_id_swap_integer;
+
+  // A function to take a look_up2 message and return the string service name
+  // that was requested via the message.
+  LookUp2GetRequestName look_up2_get_request_name;
+
+  // A function to formulate a reply to a look_up2 message, given the reply
+  // message and the port to return as the service.
+  LookUp2FillReply look_up2_fill_reply;
+};
+
+// Gets the compatibility shim for the launchd job subsystem.
+const LaunchdCompatibilityShim GetLaunchdCompatibilityShim();
+
+}  // namespace sandbox
+
+#endif  // SANDBOX_MAC_OS_COMPATIBILITY_H_