components/nacl/zygote/nacl_fork_delegate_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 COMPONENTS_NACL_ZYGOTE_NACL_FORK_DELEGATE_LINUX_H_
   6 #define COMPONENTS_NACL_ZYGOTE_NACL_FORK_DELEGATE_LINUX_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "base/basictypes.h"
  12 #include "base/compiler_specific.h"
  13 #include "base/gtest_prod_util.h"
  14 #include "content/public/common/zygote_fork_delegate_linux.h"
  15
  16 namespace base {
  17 struct LaunchOptions;
  18 }
  19
  20 template <typename>
  21 class ScopedVector;
  22
  23 namespace nacl {
  24
  25 // Appends any ZygoteForkDelegate instances needed by NaCl to |*delegates|.
  26 void AddNaClZygoteForkDelegates(
  27     ScopedVector<content::ZygoteForkDelegate>* delegates);
  28
  29 // The NaClForkDelegate is created during Chrome linux zygote
  30 // initialization, and provides "fork()" functionality with
  31 // NaCl specific process characteristics (specifically address
  32 // space layout) as an alternative to forking the zygote.
  33 // A new delegate is passed in as an argument to ZygoteMain().
  34 class NaClForkDelegate : public content::ZygoteForkDelegate {
  35  public:
  36   explicit NaClForkDelegate(bool nonsfi_mode);
  37   virtual ~NaClForkDelegate();
  38
  39   virtual void Init(int sandboxdesc, bool enable_layer1_sandbox) OVERRIDE;
  40   virtual void InitialUMA(std::string* uma_name,
  41                           int* uma_sample,
  42                           int* uma_boundary_value) OVERRIDE;
  43   virtual bool CanHelp(const std::string& process_type, std::string* uma_name,
  44                           int* uma_sample, int* uma_boundary_value) OVERRIDE;
  45   virtual pid_t Fork(const std::string& process_type,
  46                      const std::vector<int>& fds,
  47                      const std::string& channel_id) OVERRIDE;
  48   virtual bool GetTerminationStatus(pid_t pid, bool known_dead,
  49                                     base::TerminationStatus* status,
  50                                     int* exit_code) OVERRIDE;
  51
  52  private:
  53   static void AddPassthroughEnvToOptions(base::LaunchOptions* options);
  54
  55   // These values are reported via UMA and hence they become permanent
  56   // constants.  Old values cannot be reused, only new ones added.
  57   enum NaClHelperStatus {
  58     kNaClHelperUnused = 0,
  59     kNaClHelperMissing = 1,
  60     kNaClHelperBootstrapMissing = 2,
  61     kNaClHelperValgrind = 3,
  62     kNaClHelperLaunchFailed = 4,
  63     kNaClHelperAckFailed = 5,
  64     kNaClHelperSuccess = 6,
  65     kNaClHelperStatusBoundary  // Must be one greater than highest value used.
  66   };
  67
  68   const bool nonsfi_mode_;
  69   NaClHelperStatus status_;
  70   int fd_;
  71
  72   FRIEND_TEST_ALL_PREFIXES(NaClForkDelegateLinuxTest, EnvPassthrough);
  73
  74   DISALLOW_COPY_AND_ASSIGN(NaClForkDelegate);
  75 };
  76
  77 }  // namespace nacl
  78
  79 #endif  // COMPONENTS_NACL_ZYGOTE_NACL_FORK_DELEGATE_LINUX_H_