Prototype implementation of zygotes

base/reserved_file_descriptors.h

+// Copyright (c) 2006-2009 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.
+
+#ifndef BASE_RESERVED_FILE_DESCRIPTORS_H_
+#define BASE_RESERVED_FILE_DESCRIPTORS_H_
+
+#if defined(OS_POSIX)
+
+// Chrome uses predefined file descriptors to communicate with child processes.
+// Normally this is a private contract between code that does fork/exec and the
+// code it invokes, but in zygote mode, things get a little more interesting.
+// It's a huge layering violation for this to be in base, but
+// logging and ZygoteManager need kReservedFileDescriptors, so there.
+
+enum GlobalReservedFds {
+  // Classic unix file descriptors.
+  // Let's leave them alone even if we don't use them.
+  kStdinFd = 0,
+  kStdoutFd = 1,
+  kStderrFd = 2,
+
+  // See chrome/common/ipc_channel_posix.cc
+  kClientChannelFd = 3,
+
+  // See chrome/app/breakpad_linux.cc and
+  // chrome/browser/renderer_host/browser_render_process_host.cc
+  kMagicCrashSignalFd = 4,
+
+  // One plus highest fd mentioned in this enum.
+  kReservedFds = 5
+};
+
+#endif
+
+#endif