sandbox/linux/services/scoped_process.h

   1 // Copyright 2014 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 SANDBOX_LINUX_SERVICES_SCOPED_PROCESS_H_
   6 #define SANDBOX_LINUX_SERVICES_SCOPED_PROCESS_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/callback_forward.h"
  10 #include "base/process/process_handle.h"
  11 #include "sandbox/sandbox_export.h"
  12
  13 namespace sandbox {
  14
  15 // fork() a child process that will run a Closure.
  16 // After the Closure has run, the child will pause forever. If this object
  17 // is detroyed, the child will be destroyed, even if the closure did not
  18 // finish running. It's ok to signal the child from outside of this class to
  19 // destroy it.
  20 // This class cannot be instanciated from a multi-threaded process, as it needs
  21 // to fork().
  22 class SANDBOX_EXPORT ScopedProcess {
  23  public:
  24   // A new process will be created and |child_callback| will run in the child
  25   // process. This callback is allowed to terminate the process or to simply
  26   // return. If the callback returns, the process will wait forever.
  27   explicit ScopedProcess(const base::Closure& child_callback);
  28   ~ScopedProcess();
  29
  30   // Wait for the process to exit.
  31   // |got_signaled| tells how to interpret the return value: either as an exit
  32   // code, or as a signal number.
  33   // When this returns, the process will still not have been reaped and will
  34   // survive as a zombie for the lifetime of this object. This method can be
  35   // called multiple times.
  36   int WaitForExit(bool* got_signaled);
  37
  38   // Wait for the |child_callback| passed at construction to run. Return false
  39   // if |child_callback| did not finish running and we know it never will (for
  40   // instance the child crashed or used _exit()).
  41   bool WaitForClosureToRun();
  42   base::ProcessId GetPid() { return child_process_id_; }
  43
  44  private:
  45   bool IsOriginalProcess();
  46
  47   base::ProcessId child_process_id_;
  48   base::ProcessId process_id_;
  49   int pipe_fds_[2];
  50   DISALLOW_COPY_AND_ASSIGN(ScopedProcess);
  51 };
  52
  53 }  // namespace sandbox
  54
  55 #endif  // SANDBOX_LINUX_SERVICES_SCOPED_PROCESS_H_