components/nacl/common/nacl_helper_linux.h

   1 // Copyright 2013 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 COMPONENTS_NACL_COMMON_NACL_HELPER_LINUX_H_
   6 #define COMPONENTS_NACL_COMMON_NACL_HELPER_LINUX_H_
   7
   8 // A mini-zygote specifically for Native Client. This file defines
   9 // constants used to implement communication between the nacl_helper
  10 // process and the Chrome zygote.
  11
  12 #define kNaClMaxIPCMessageLength 2048
  13
  14 // Used by Helper to tell Zygote it has started successfully.
  15 #define kNaClHelperStartupAck "NACLHELPER_OK"
  16
  17 enum NaClZygoteIPCCommand {
  18   kNaClForkRequest,
  19   kNaClGetTerminationStatusRequest,
  20 };
  21
  22 // The next set of constants define global Linux file descriptors.
  23 // For communications between NaCl loader and browser.
  24 // See also content/common/zygote_main_linux.cc and
  25 // http://code.google.com/p/chromium/wiki/LinuxZygote
  26
  27 // For communications between NaCl loader and zygote.
  28 #define kNaClZygoteDescriptor 3
  29 // For communications between the NaCl loader process and
  30 // the SUID sandbox.
  31 #define kNaClSandboxDescriptor 5
  32 // NOTE: kNaClSandboxDescriptor must match
  33 // content/browser/zygote_main_linux.cc
  34 // kMagicSandboxIPCDescriptor.
  35
  36 // A fork request from the Zygote to the helper includes an array
  37 // of three file descriptors. These constants are used as indicies
  38 // into the array.
  39 // Used to pass in the descriptor for talking to the Browser
  40 #define kNaClBrowserFDIndex 0
  41 // The next two are used in the protocol for discovering the
  42 // child processes real PID from within the SUID sandbox. See
  43 // http://code.google.com/p/chromium/wiki/LinuxZygote
  44 #define kNaClDummyFDIndex 1
  45 #define kNaClParentFDIndex 2
  46
  47 #endif  // COMPONENTS_NACL_COMMON_NACL_HELPER_LINUX_H_