libchromeos: revert add process control library, syslog logging capability, and run unit tests

chromeos/process.h

-// Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CHROMEOS_PROCESS_H_
-#define CHROMEOS_PROCESS_H_
-
-#include <sys/types.h>
-
-#include <string>
-#include <vector>
-
-#include <base/string_util.h>
-
-namespace chromeos {
-// Manages a process.  Can create the process, attach to an existing
-// process by pid or pid file, and kill the process.  Upon destruction
-// any managed process is killed with SIGKILL.  Use Release() to
-// release the process from management.  A given system process may
-// only be managed by one Process at a time.
-class Process {
- public:
-  Process();
-  virtual ~Process();
-
-  // Adds |arg| to the executable command-line to be run.  The
-  // executable name itself is the first argument.
-  virtual void AddArg(const std::string& arg) = 0;
-
-  // Adds |option| and |value| as an option with a string value to the
-  // command line to be run.
-  inline void AddStringOption(const std::string& option,
-                              const std::string& value) {
-    AddArg(option);
-    AddArg(value);
-  }
-
-  // Adds |option| and |value| as an option which takes an integer
-  // value to the command line to be run.
-  inline void AddIntOption(const std::string& option, int value) {
-    AddArg(option);
-    AddArg(StringPrintf("%d", value));
-  }
-
-  // Redirects stderr and stdout to |output_file|.
-  virtual void RedirectOutput(const std::string& output_file) = 0;
-
-  // Starts this process, returning true if successful.
-  virtual bool Start() = 0;
-
-  // Waits for this process to finish.  Returns the process's exit
-  // status if it exited normally, or otherwise returns -1.
-  virtual int Wait() = 0;
-
-  // Start and wait for this process to finish.  Returns same value as
-  // Wait().
-  virtual int Run() = 0;
-
-  // Returns the pid of this process or else returns 0 if there is no
-  // corresponding process (either because it has not yet been started
-  // or has since exited).
-  virtual pid_t pid() = 0;
-
-  // Kills this process with |signal|.  If process is not a child,
-  // returns immediately with a value based on whether kill was
-  // successful.  If the process is a child and |timeout| is non-zero,
-  // returns true if the process is able to be reaped within the given
-  // |timeout| in seconds.
-  virtual bool Kill(int signal, int timeout) = 0;
-
-  // Resets this Process object to refer to the process with |pid|.
-  // If |pid| is zero, this object no longer refers to a process.
-  virtual void Reset(pid_t new_pid) = 0;
-
-  // Same as Reset but reads the pid from |pid_file|.  Returns false
-  // only when the file cannot be read/parsed.
-  virtual bool ResetPidByFile(const std::string& pid_file) = 0;
-
-  // Releases the process so that on destruction, the process is not killed.
-  virtual pid_t Release() = 0;
-
-  // Returns if |pid| is a currently running process.
-  static bool ProcessExists(pid_t pid);
-};
-
-class ProcessImpl : public Process {
- public:
-  ProcessImpl();
-  virtual ~ProcessImpl();
-
-  virtual void AddArg(const std::string& arg);
-  virtual void RedirectOutput(const std::string& output_file);
-  virtual bool Start();
-  virtual int Wait();
-  virtual int Run();
-  virtual pid_t pid();
-  virtual bool Kill(int signal, int timeout);
-  virtual void Reset(pid_t pid);
-  virtual bool ResetPidByFile(const std::string& pid_file);
-  virtual pid_t Release();
-
- protected:
-  std::string output_file_;
-  std::vector<std::string> arguments_;
-
-  void UpdatePid(pid_t new_pid);
-
- private:
-  // Pid of currently managed process or 0 if no currently managed
-  // process.  pid must not be modified except by calling
-  // UpdatePid(new_pid).
-  pid_t pid_;
-};
-
-}  // namespace chromeos
-
-#endif  // CHROMEOS_PROCESS_H