1 // Copyright (c) 2006-2008 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 BASE_PROCESS_H_ 6 #define BASE_PROCESS_H_ 7 8 #include "base/basictypes.h" 9 #include "build/build_config.h" 10 11 #include <sys/types.h> 12 #ifdef OS_WIN 13 #include <windows.h> 14 #endif 15 16 namespace base { 17 18 // ProcessHandle is a platform specific type which represents the underlying OS 19 // handle to a process. 20 // ProcessId is a number which identifies the process in the OS. 21 #if defined(OS_WIN) 22 typedef HANDLE ProcessHandle; 23 typedef DWORD ProcessId; 24 typedef HANDLE UserTokenHandle; 25 const ProcessHandle kNullProcessHandle = NULL; 26 #elif defined(OS_POSIX) 27 // On POSIX, our ProcessHandle will just be the PID. 28 typedef pid_t ProcessHandle; 29 typedef pid_t ProcessId; 30 const ProcessHandle kNullProcessHandle = 0; 31 #endif 32 33 #if defined(OS_POSIX) && !defined(OS_MACOSX) 34 // saved_priority_ will be set to this to indicate that it's not holding 35 // a valid value. -20 to 19 are valid process priorities. 36 const int kUnsetProcessPriority = 256; 37 #endif 38 39 class Process { 40 public: 41 Process() : process_(kNullProcessHandle) { 42 #if defined(OS_POSIX) && !defined(OS_MACOSX) 43 saved_priority_ = kUnsetProcessPriority; 44 #endif 45 } 46 47 explicit Process(ProcessHandle handle) : process_(handle) { 48 #if defined(OS_POSIX) && !defined(OS_MACOSX) 49 saved_priority_ = kUnsetProcessPriority; 50 #endif 51 } 52 53 // A handle to the current process. 54 static Process Current(); 55 56 // Get/Set the handle for this process. The handle will be 0 if the process 57 // is no longer running. 58 ProcessHandle handle() const { return process_; } 59 void set_handle(ProcessHandle handle) { 60 process_ = handle; 61 #if defined(OS_POSIX) && !defined(OS_MACOSX) 62 saved_priority_ = kUnsetProcessPriority; 63 #endif 64 } 65 66 // Get the PID for this process. 67 ProcessId pid() const; 68 69 // Is the this process the current process. 70 bool is_current() const; 71 72 // Close the process handle. This will not terminate the process. 73 void Close(); 74 75 // Terminates the process with extreme prejudice. The given result code will 76 // be the exit code of the process. If the process has already exited, this 77 // will do nothing. 78 void Terminate(int result_code); 79 80 // A process is backgrounded when it's priority is lower than normal. 81 // Return true if this process is backgrounded, false otherwise. 82 bool IsProcessBackgrounded() const; 83 84 // Set a process as backgrounded. If value is true, the priority 85 // of the process will be lowered. If value is false, the priority 86 // of the process will be made "normal" - equivalent to default 87 // process priority. 88 // Returns true if the priority was changed, false otherwise. 89 bool SetProcessBackgrounded(bool value); 90 91 // Returns an integer representing the priority of a process. The meaning 92 // of this value is OS dependent. 93 int GetPriority() const; 94 95 private: 96 ProcessHandle process_; 97 #if defined(OS_POSIX) && !defined(OS_MACOSX) 98 // Holds the priority that the process was set to when it was backgrounded. 99 // If the process wasn't backgrounded it will be kUnsetProcessPriority. 100 int saved_priority_; 101 #endif 102 }; 103 104 } // namespace base 105 106 #endif // BASE_PROCESS_H_ 107
