content/browser/zygote_host/zygote_host_impl_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_BROWSER_ZYGOTE_HOST_ZYGOTE_HOST_IMPL_LINUX_H_
   6 #define CONTENT_BROWSER_ZYGOTE_HOST_ZYGOTE_HOST_IMPL_LINUX_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "base/pickle.h"
  12 #include "base/process/kill.h"
  13 #include "base/synchronization/lock.h"
  14 #include "content/public/browser/file_descriptor_info.h"
  15 #include "content/public/browser/zygote_host_linux.h"
  16
  17 template<typename Type>
  18 struct DefaultSingletonTraits;
  19
  20 namespace content {
  21
  22 class CONTENT_EXPORT ZygoteHostImpl : public ZygoteHost {
  23  public:
  24   // Returns the singleton instance.
  25   static ZygoteHostImpl* GetInstance();
  26
  27   void Init(const std::string& sandbox_cmd);
  28
  29   // Tries to start a process of type indicated by process_type.
  30   // Returns its pid on success, otherwise
  31   // base::kNullProcessHandle;
  32   pid_t ForkRequest(const std::vector<std::string>& command_line,
  33                     const std::vector<FileDescriptorInfo>& mapping,
  34                     const std::string& process_type);
  35   void EnsureProcessTerminated(pid_t process);
  36
  37   // Get the termination status (and, optionally, the exit code) of
  38   // the process. |exit_code| is set to the exit code of the child
  39   // process. (|exit_code| may be NULL.)
  40   // Unfortunately the Zygote can not accurately figure out if a process
  41   // is already dead without waiting synchronously for it.
  42   // |known_dead| should be set to true when we already know that the process
  43   // is dead. When |known_dead| is false, processes could be seen as
  44   // still running, even when they're not. When |known_dead| is true, the
  45   // process will be SIGKILL-ed first (which should have no effect if it was
  46   // really dead). This is to prevent a waiting waitpid() from blocking in
  47   // a single-threaded Zygote. See crbug.com/157458.
  48   base::TerminationStatus GetTerminationStatus(base::ProcessHandle handle,
  49                                                bool known_dead,
  50                                                int* exit_code);
  51
  52   // ZygoteHost implementation:
  53   virtual pid_t GetPid() const OVERRIDE;
  54   virtual pid_t GetSandboxHelperPid() const OVERRIDE;
  55   virtual int GetSandboxStatus() const OVERRIDE;
  56   virtual void AdjustRendererOOMScore(base::ProcessHandle process_handle,
  57                                       int score) OVERRIDE;
  58   virtual void AdjustLowMemoryMargin(int64 margin_mb) OVERRIDE;
  59
  60  private:
  61   friend struct DefaultSingletonTraits<ZygoteHostImpl>;
  62
  63   ZygoteHostImpl();
  64   virtual ~ZygoteHostImpl();
  65
  66   // Sends |data| to the zygote via |control_fd_|.  If |fds| is non-NULL, the
  67   // included file descriptors will also be passed.  The caller is responsible
  68   // for acquiring |control_lock_|.
  69   bool SendMessage(const Pickle& data, const std::vector<int>* fds);
  70
  71   ssize_t ReadReply(void* buf, size_t buflen);
  72
  73   int control_fd_;  // the socket to the zygote
  74   // A lock protecting all communication with the zygote. This lock must be
  75   // acquired before sending a command and released after the result has been
  76   // received.
  77   base::Lock control_lock_;
  78   pid_t pid_;
  79   bool init_;
  80   bool using_suid_sandbox_;
  81   std::string sandbox_binary_;
  82   bool have_read_sandbox_status_word_;
  83   int sandbox_status_;
  84 };
  85
  86 }  // namespace content
  87
  88 #endif  // CONTENT_BROWSER_ZYGOTE_HOST_ZYGOTE_HOST_IMPL_LINUX_H_