content/common/zygote_commands_linux.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_COMMON_ZYGOTE_COMMANDS_LINUX_H_
   6 #define CONTENT_COMMON_ZYGOTE_COMMANDS_LINUX_H_
   7
   8 namespace content {
   9
  10 // Contents of the initial message sent from the zygote to the browser when it
  11 // is ready to go.
  12 static const char kZygoteHelloMessage[] = "ZYGOTE_OK";
  13
  14 // Maximum allowable length for messages sent to the zygote.
  15 const size_t kZygoteMaxMessageLength = 8192;
  16
  17 // File descriptors initialized by the Zygote Host
  18 const int kZygoteSocketPairFd = 3;
  19 const int kZygoteRendererSocketFd = 5;
  20 // This file descriptor is special. It is passed to the Zygote and a setuid
  21 // helper will be called to locate the process of the Zygote on the system.
  22 // This mechanism is used when multiple PID namespaces exist because of the
  23 // setuid sandbox.
  24 // It is very important that this file descriptor does not exist in multiple
  25 // processes.
  26 // This number must be kept in sync in sandbox/linux/suid/sandbox.c
  27 const int kZygoteIdFd = 7;
  28
  29 // These are the command codes used on the wire between the browser and the
  30 // zygote.
  31 enum {
  32   // Fork off a new renderer.
  33   kZygoteCommandFork = 0,
  34
  35   // Reap a renderer child.
  36   kZygoteCommandReap = 1,
  37
  38   // Check what happened to a child process.
  39   kZygoteCommandGetTerminationStatus = 2,
  40
  41   // Read a bitmask of kSandboxLinux*
  42   kZygoteCommandGetSandboxStatus = 3
  43 };
  44
  45 }  // namespace content
  46
  47 #endif  // CONTENT_COMMON_ZYGOTE_COMMANDS_LINUX_H_