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 "content/public/common/zygote_fork_delegate_linux.h"
  14
  15 // The NaClForkDelegate is created during Chrome linux zygote
  16 // initialization, and provides "fork()" functionality with
  17 // NaCl specific process characteristics (specifically address
  18 // space layout) as an alternative to forking the zygote.
  19 // A new delegate is passed in as an argument to ZygoteMain().
  20 class NaClForkDelegate : public content::ZygoteForkDelegate {
  21  public:
  22   NaClForkDelegate();
  23   virtual ~NaClForkDelegate();
  24
  25   virtual void Init(int sandboxdesc) OVERRIDE;
  26   virtual void InitialUMA(std::string* uma_name,
  27                           int* uma_sample,
  28                           int* uma_boundary_value) OVERRIDE;
  29   virtual bool CanHelp(const std::string& process_type, std::string* uma_name,
  30                           int* uma_sample, int* uma_boundary_value) OVERRIDE;
  31   virtual pid_t Fork(const std::vector<int>& fds) OVERRIDE;
  32   virtual bool AckChild(int fd,
  33                         const std::string& channel_switch) OVERRIDE;
  34   virtual bool GetTerminationStatus(pid_t pid, bool known_dead,
  35                                     base::TerminationStatus* status,
  36                                     int* exit_code) OVERRIDE;
  37
  38  private:
  39   // These values are reported via UMA and hence they become permanent
  40   // constants.  Old values cannot be reused, only new ones added.
  41   enum NaClHelperStatus {
  42     kNaClHelperUnused = 0,
  43     kNaClHelperMissing = 1,
  44     kNaClHelperBootstrapMissing = 2,
  45     kNaClHelperValgrind = 3,
  46     kNaClHelperLaunchFailed = 4,
  47     kNaClHelperAckFailed = 5,
  48     kNaClHelperSuccess = 6,
  49     kNaClHelperStatusBoundary  // Must be one greater than highest value used.
  50   };
  51
  52   NaClHelperStatus status_;
  53   int fd_;
  54 };
  55
  56 #endif  // COMPONENTS_NACL_ZYGOTE_NACL_FORK_DELEGATE_LINUX_H_