libchromeos: 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>
+
+// 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.
+class Process {

[petkov, 2011/02/25 19:20:16]

You need brief docstrings for the individual methods of this class.

[kmixter1, 2011/02/26 00:54:31]

Done.

+ public:
+  Process();
+  virtual ~Process();
+
+  virtual void AddArg(const std::string& arg) = 0;
+  inline void AddStringValue(const std::string& arg, const std::string& value) {
+    AddArg(arg);
+    AddArg(value);
+  }
+  inline void AddIntValue(const std::string& arg, int value) {
+    AddArg(arg);
+    AddArg(StringPrintf("%d", value));
+  }
+  virtual void SetOutput(const std::string& output_file) = 0;
+  virtual bool Start() = 0;
+  virtual int Wait() = 0;
+  virtual int Run() = 0;
+  virtual pid_t GetPid() = 0;
+  virtual bool Kill(int signal, int timeout) = 0;
+  virtual void Reset(pid_t pid) = 0;
+  virtual bool ResetPidByFile(const std::string& pid_file) = 0;
+  virtual pid_t Release() = 0;
+
+  static bool ProcessExists(pid_t pid);
+};
+
+class ProcessImpl : public Process {
+ public:
+  ProcessImpl();
+  virtual ~ProcessImpl();
+
+  virtual void AddArg(const std::string& arg);
+  virtual void SetOutput(const std::string& output_file);
+  virtual bool Start();
+  virtual int Wait();
+  virtual int Run();
+  virtual pid_t GetPid();
+  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_;
+  pid_t pid_;
+  std::vector<std::string> arguments_;
+};
+
+#endif  // CHROMEOS_PROCESS_H