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 #include "base/posix/global_descriptors.h"
   9 #include "ipc/ipc_descriptors.h"
  10
  11 namespace content {
  12
  13 // Contents of the initial message sent from the zygote to the browser right
  14 // after it starts.
  15 static const char kZygoteBootMessage[] = "ZYGOTE_BOOT";
  16
  17 // Contents of the initial message sent from the zygote to the browser when it
  18 // is ready to go.
  19 static const char kZygoteHelloMessage[] = "ZYGOTE_OK";
  20
  21 // Message sent by zygote children to the browser so the browser can discover
  22 // the sending child's process ID.
  23 static const char kZygoteChildPingMessage[] = "CHILD_PING";
  24
  25 // Maximum allowable length for messages sent to the zygote.
  26 const size_t kZygoteMaxMessageLength = 8192;
  27
  28 // File descriptors initialized by the Zygote Host
  29 const int kZygoteSocketPairFd =
  30     kPrimaryIPCChannel + base::GlobalDescriptors::kBaseDescriptor;
  31
  32 // These are the command codes used on the wire between the browser and the
  33 // zygote.
  34 enum {
  35   // Fork off a new renderer.
  36   kZygoteCommandFork = 0,
  37
  38   // Reap a renderer child.
  39   kZygoteCommandReap = 1,
  40
  41   // Check what happened to a child process.
  42   kZygoteCommandGetTerminationStatus = 2,
  43
  44   // Read a bitmask of kSandboxLinux*
  45   kZygoteCommandGetSandboxStatus = 3,
  46
  47   // Not a real zygote command, but a subcommand used during the zygote fork
  48   // protocol.  Sends the child's PID as seen from the browser process.
  49   kZygoteCommandForkRealPID = 4
  50 };
  51
  52 }  // namespace content
  53
  54 #endif  // CONTENT_COMMON_ZYGOTE_COMMANDS_LINUX_H_